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Siemens MOBY I ASM 421, Technical Description

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ASM 421 Technical Description

6GT2 097-3AH00-0DA2

– 20 –

RD: 03/02

6GT2 002-0DA00

ASM 421 / V.24

Subject to change without notice!

6GT2 002-0DB00

ASM 421 / RS422

6GT2 002-0DC00

ASM 421 / TTY

J31069-D0142-U001-A0-7618

3.2

Telegram format

The user communicates with the file handler via telegrams. Telegrams from the user are checked, inter-
preted and processed by the file handler. The user then receives an acknowledgement telegram contain-
ing user data and status information.

The following schematic shows the general telegram format:

Telegram heading (always present)

res.
ABS

res.
EMPF

res.
LFN

CC

CI

Command

ADB

DBN

DBL

User data

0

1

2/3

4/5

6/7

8/9

10

reserved for sender identifier*
(MOBY I:  code ’F’ is reserved for STG )

reserved for receiver recognition*
(presently always 00)

reserved for sequence number
(The file handler transmits the parameter LFN from the command in the
acknowledgement. It is not evaluated by the file handler)

Command code:
’I’

:

FORMAT

(Format)

’B’

:

CREATE

(Open file)

’Q’ :

QUEUE-WRITE

(Set up complete data carrier)

’W’ :

WRITE

’U’

:

UPDATE

(Write complete file)

’R’

:

READ

’D’

:

DELETE

’Y’

:

ATTRIB

(Set access rights for a file)

’C’

:

COVER

(Protect MDS structure)

’G’ :

DIR

(Read file directory)

’N’

:

NEXT

(Process next MDS)

’X’

:

RESET

(Reset file handler)

’F’

:

MDS-STATUS

(Request MDS status)

’S’

:

ASM-STATUS

(ASM status request)

’L’

:

LOAD

(Transmit directory to ASM)

’M’ :

MOVE

(Read MDS directory out from ASM)

’T’

:

TRACE

(absolute read)

’H’

:

Start-up message from ASM

’Z’

:

Special telegram (ANW message)

Command  index
’I’

:

MOBY I command from ASM

xx

:

MOBY I status byte: acknowledgement from ASM

The user data depends on the command (see 3.4)

Length of user data following (dual)

Current data block number (dual)

Total number of data blocks to be transmitted (dual)

7

6

5

4

3

2

1

0

reserved
(always 00)

1 = Command terminated with error; the user

data contains error information.

1 = Only with ECC: data from the MDS has been

corrected and is OK.

1 = The RAM battery is poor or exhausted (always set for

EEPROM MDS).

1 = Aux. battery is poor or exhausted (only valid for

MDS 507; otherwise always 1).

1 = WARNING: MDS was outside the transmission window during

command processing.

1 = WARNING: File read had length = 0.

1 = An MDS with a new directory has entered: the bit is set when the file handler

has carried out a read operation on the complete MDS directory. In some
applications, the new directory can be backed up by the MOVE command.
The result of the last command will be delayed by the directory operation.

* The file handler interchanges sender and receiver identifiers.

Summary of Contents for MOBY I ASM 421

Page 1: ...mming the ASM 421 module 3 Cold start and restart 4 Checking entry and exit of MDS in SLG transmission window 5 System and transmission times 6 Troubleshooting and error messages 7 Warnings 8 Published in March 2002 6GT2 097 3AH00 0DA2 ASM 421 Interface Module Technical Description MOBY I ...

Page 2: ...vice and its components may only be used for the applications described in the catalog or technical description and only in connection with devices or components from other manufactorers which have been approved or recommended by Siemens This product can only function correctly and savely if it is transported stored set up and installed correctly and operated and maintained as recommended Trademar...

Page 3: ...locking of long data sequences 21 3 4 File handler commands 22 3 4 1 FORMAT 23 3 4 2 CREATE 24 3 4 3 QUEUE WRITE 25 3 4 4 WRITE UPDATE 27 3 4 5 READ 29 3 4 6 QUEUE READ 31 3 4 7 DELETE 34 3 4 8 COVER 35 3 4 9 DIR 36 3 4 10 MDS status 37 3 4 11 ASM Status 38 3 4 12 TRACE 39 3 4 13 ATTRIB 40 3 4 14 NEXT 41 3 4 15 RESET 42 3 4 16 LOAD MOVE 44 3 5 Telegrams from file handler 46 3 5 1 Start up message ...

Page 4: ...uch the same way as a floppy disk system MOBY I File Handler Floppy Disk System MDS Data is stored electronically in the MDS on a memory chip RAM or EEPROM SLG The SLG modulates the data stream arriving from the ASM and demodulates the data stream arriving from the MDS The positioning of the MDS must lie within the transmis sion window of the SLG This amounts to several centime ters The MOBY I int...

Page 5: ...r logical blocks Advantages of the file handler for the MOBY I user When specifying a system it is only necessary to define the names file names of the individual data objects that are to be stored on the MDS The project engineer does not need to structure MDS memory at all The list of data objects can be changed or extended as required during detailed planning The MDS data structure does not need...

Page 6: ...FORMAT com mand see section 3 4 1 The following table shows how the file handler structures the various types of MDS 05H 85H 8 189 7 154 32 32 7 456 6 464 233 202 32 32 Type Hex Enter this parameter when initi alizing 01H 81H 02H 03H 83H 04H 84H 62 MDS capacity in bytes gross Total MDS memory size 42 1 Max no of files Max number of files that can 1 be stored User data in bytes net Max no of user b...

Page 7: ...eration 3 LEDs red LED indicates a fault see table in chap 7 yellow LED indicates that the SLG device is active green LED indicates that an MDS is present 9 way subminiature D connector screw locking X2 for connecting the SLG read write device The SLG can also be connected via the back plane connector if required Pin Function 1 2 3 4 5 6 7 8 9 reserve transmit receive reserve receive transmit grou...

Page 8: ...s TTY 1000 m shielded RS422 1000 m shielded V 24 30 m shielded Serial interface to SLG transmission rate gross 19200 Baud procedure Asynchronous 8 bit data even parity MOBY I MDS protocol cable lengths SLG dependent max 1000 m see cable configurations in manual for configuration installation and service Power supply 20 to 30 V DC Current input max off load current 200 mA no SLG DO s off load Dimen...

Page 9: ... z14 z16 z18 z20 z22 z24 z26 z28 z30 z32 DI0 DO0 SLG transmit 0 V DI1 DO1 Select module Select SLG receive SLG transmit 0 V Interface type dependent 24 V Interface type dependent Protective ground same as green LED Protective ground MDS entry when EAKO 2 and EAKO 3 free MDS exit when EAKO 3 free ASM has user data or acknowledgement Request Error code same as red LED Presence ANW R terminatingresis...

Page 10: ...ors conforming to DIN 41612 design F must be used as mating components for the ASM 421 connector In principle all 48 way female connectors conforming to DIN 41612 design F are suitable Various types of female connectors are available e g with solder terminations with a screw connection as a wire wrap version e g SFL 0 5 F 32 2 B 10 5 23 6 14 8 Female connector with screw connec tion 0 5 mm2 rows z...

Page 11: ...mity message from ASM Z message 0 no proximity message Access rights of this ASM station 00 01 Step D Delete all commands allowed 10 Step W Write Formatting of MDS and deletion of files are not allowed 11 Step R Read only only read operations on the MDS are allowed 0 Siemens file handler is set up 1 reserved for 8 E41 1 Master 0 Slave 1 odd parity 0 even parity Baud rate 00 9600 Baud 01 4800 Baud ...

Page 12: ... The SLG read write device can be connected to either the X1 backplane connector or the 9 way subminiature D connector X2 one select line for each ASM 421 one request line for each ASM 421 serial interface PLC PC or computer Please note The Select and Re quest lines may be omitted if only one ASM 421 is being driven from a serial in terface The external wiring of unnecessary signals can also be om...

Page 13: ...he ASM indicates that it wants to send a telegram The computer PC recognizes this and selects the module The selected ASM then sends the result telegram Task telegram to ASM Response telegram from ASM t2 t5 t4 t2 t1 t3 Data Request Select t1 100 ms Wait time from select until data transmission t2 0 Wait time from data transmission until deselection of ASM 421 t3 Depends on Processing of user comma...

Page 14: ...UV 24 V UV 30 V 30 70 85 210 230 570 320 800 660 1000 UV 24 V Max cable length when Max cable length when SLG 44 I 80 mA UV 24 V UV 30 V 90 200 250 650 700 1000 1000 1000 1000 1000 Max cable length when Con ductor cross section mm2 0 07 0 2 0 5 0 8 1 5 The values for resistance are average values and relate to the feed and return conductors An individu al conductor has half the quoted resistance I...

Page 15: ...ve b4 z4 b6 z6 X1 SE SE EM EM X2 1 9 SLG b30 z30 The ASM module does not contain any power sources for energizing the active part of the TTY interface Should however it become necessary for the ASM to power the interface the ASM should be wired as follows to make it active TxD RxD max length 1000 m TxD RxD R R R R ASM 421 active b4 z4 b6 z6 b32 z2 X1 Computer passive X2 1 9 SLG b30 z30 The resisto...

Page 16: ... ASM 421 No 1 ASM 421 No 2 ASM 421 No 4 b16 b4 b6 z6 z4 b4 b6 z6 z4 b4 b6 SLG SLG z4 z4 b32 b32 Request dig out puts Select z16 b16 z16 b16 z16 Where possible the computer should handle the active part of the TTY interface in which case the resis tors shown on ASM no 1 will not be needed If this is not possible as shown in the diagram the active part of the interface must be simulated in the conne...

Page 17: ...articularly when long cables are used i e 200 m The jumpers may only be wired on the last ASM 421 when daisy chain operation is used see chapter 2 4 1 The indicated terminal resistors R 200 to 1000 Ohm must be present on the computer side These resistors can be wired on the ASM side when short cables are used This means jumpers z6 z8 and b4 z4 are omitted and 2 jumpers are added i e b4 b6 and z6 b...

Page 18: ...puter max length 30 m b32 b6 z4 X2 1 9 SLG X1 b30 z30 V 24 control lines e g DSR DTR RTS CTS are not supported by the ASM The acknowledgement of data is handled by the procedure 2 4 6 STG cabling TxD RxD 1 9 ASM 421 STG 4F Test cable length max 100 m E D D E X1 z2 z8 b8 b6 z4 b32 0V X2 1 9 SLG 24 V b30 z30 z6 b4 The ASM 421 RS422 can be operated directly with the STG 4F The complete path from the ...

Page 19: ...2 002 0DB00 ASM 421 RS422 6GT2 002 0DC00 ASM 421 TTY J31069 D0142 U001 A0 7618 2 4 7 DI DO cabling Cable length max 100 m shielded or unshielded 220 V 24 V ANW Error code DI 1 DI 0 Imax 200 mA per DO or Proximity switch total current ASM 421 z2 z18 b18 z12 b12 b2 Relay use break contact in load circuit of relay horn lamps etc ...

Page 20: ...hex to FFhex can be present in the data block Character frame Transmission asynchronous Baud rate 2400 4800 9600 19200 Baud Data bits 8 Parity odd even switch selectable Stop bit 1 1 2 3 4 5 6 7 8 P 8 data bits Start step Parity bit Stop bit Character frame 11 bits Start step Next character t Control characters in the 3964R procedure Character Code hex Purpose STX DLE ETX DLE NAK DLE DLE 02 10 03 ...

Page 21: ...964R has a repeat counter If a block cannot be correctly transmitted after a number of repeats the trans mission will be terminated The telegram is lost or the user receives an error message Initiation conflict Since both stations have equal rights an initiation conflict can arise if both partners try to transmit at the same time To avoid this one station is given a higher priority master than the...

Page 22: ...e G DIR Read file directory N NEXT Process next MDS X RESET Reset file handler F MDS STATUS Request MDS status S ASM STATUS ASM status request L LOAD Transmit directory to ASM M MOVE Read MDS directory out from ASM T TRACE absolute read H Start up message from ASM Z Special telegram ANW message Command index I MOBY I command from ASM xx MOBY I status byte acknowledgement from ASM The user data dep...

Page 23: ... segments DBN 1 Schematic sequence example WRITE I 0003 User data 1st command telegram from user to ASM CC CI ADB DBN DBL File description The command consists of three telegram segments 00 0003 1st acknowledgement telegram from ASM to user CC CI ADB DBN DBL 0001 0001 I 0003 User data 2nd command telegram from user to ASM CC CI ADB 0002 00 0003 2nd acknowledgement telegram from ASM to user CC CI 0...

Page 24: ...Read MDS status RWD X RESET Reset command to ASM RWD N NEXT Process the next MDS RWD T TRACE MDS absolute read RWD Z Presence Proximity message from ASM 00 00 0000 B 0001 0001 0C F name Attr res length I 00 00 0000 W ADB 0001 DBL F name Adr Leng I Data 00 00 0000 R 0001 0001 0E F name Adr Leng I 00 00 0000 D 0001 0001 08 F name I 00 00 0000 Y 0001 0001 09 F name Attr I 00 00 0000 G 0001 0001 00 I ...

Page 25: ...ta if the parameter INIT mode has the value L K Not initialized only DIR and FAT will be re created on the MDS The old user data remains physically in memory L Initialized the whole MDS will be written with the data in INIT value I 0001 See table in Chapter 1 0 0 0 0 7 6 5 4 3 2 1 0 Bit 1 Check sum mechanism enabled DIR and FAT are only read if the checksum in the interface module does not corresp...

Page 26: ...ot be erased with DELETE The data must be written using the automatic append function B CC CI ADB DBN DBL xx 00 0000 0001 0CH F name Attribute Data length to be res 0 1 2 3 4 5 6 7 8 9 10 11 18 19 20 22 File name 8 ASCII characters 20H 7EH The file handler reserves the file length given here If 000000H is given as the data length the file handler reserves a block as standard procedure Note Specifi...

Page 27: ...Data entry 13 18 19 21 25 file entries Additional data entries Option The following applies if the data carrier already contains an existing file structure Option 0000H The file structure is overwritten or deleted with the QUEUE WRITE command Option 0001H The file structure is added to the existing file structure with the QUEUE WRITE command A check is made to determine whether the file to be set ...

Page 28: ...handler detects a syntax error in the structure of the transmitted file entry the QUEUE WRITE command is aborted with an appropriate error message In addition the QUEUE WRITE command is aborted with the option 0001 hex if the file handler determines that the file to be set up already exists Error Identification for Parameter Error in File Entry K x x x xxx stands for the number of the file entry i...

Page 29: ...FF The automatic append function is activated by the start address 1 New data will be appended to the existing file User data in any format Total length of data to be written no of bytes in hex format I 0001 Length of the data following in the telegram Number of command segments for the write command The user must calculate ADB correctly U W WRITE All or only part of a file can be written with the...

Page 30: ... 230 244 and 26 bytes W CC CI ADB DBN DBL xx 00 0000 0003 0 1 2 3 4 5 6 7 8 9 10 0001 F4H I EXAMPLE 000000 0001F4H xx xx 11 18 19 21 22 24 25 254 File name Start addr Length Data 230 bytes 1st telegram segment to file handler W CC Status ADB DBN DBL 00 xx 0000 0003 0 1 2 3 4 5 6 7 8 9 10 00 0001 00 Acknowledgement W CC CI ADB DBN DBL xx 00 0000 0003 0 1 2 3 4 5 6 7 8 9 10 0002 F4H I xx xx xx xx xx...

Page 31: ...ds the complete file The start address must be given a value of 000000 The actual data length will be passed to the user in the DBL parameter If a start address not equal to 000000 is entered the file handler reads the file from the specified address to the end of file Offset address within the file hex A data file always begins at address 000000 If only a part of the file is read in order to give...

Page 32: ...xx 0000 0003 0 1 2 3 4 5 6 7 8 9 10 0001 F4H 00 xx xx xx xx xx xx xx xx xx xx 11 254 Data 244 bytes Acknowledgement R CC CI ADB DBN DBL xx 00 0000 0003 0 1 2 3 4 5 6 7 8 9 10 0002 00 I 2nd telegram segment to file handler R CC Status ADB DBN DBL xx 00 0000 0003 0 1 2 3 4 5 6 7 8 9 10 0002 F4H 00 xx xx xx xx xx xx xx xx xx xx 11 254 Data 244 bytes Acknowledgement R CC CI ADB DBN DBL xx 00 0000 0003...

Page 33: ...ata contain the files that are not to be read This means that all files of the data memory are read except the files specified in the command The length parameter in the file entry can be disregarded for this option 0010 The read file data are organized by word and are directly appended to each other This means that a skip byte with the value 20hex is added to odd length files The skip parameter h...

Page 34: ...ry 8 bytes 1 byte 3 bytes 2 bytes Length of the file data for this file The data may cover several subtelegrams The file name is identical to the file name in the com mand with option 0008 the unparameterized file names appear here Number of data bytes after the data up to the beginning of the next file name Skip is always valid With some options skip always has the value 0000 File data Skip bytes...

Page 35: ... 10 0001 F4H 00 11 to 254 Data 244 bytes Acknowledgment File entries data E KK KI ADB DBN DBL xx 00 0000 0003 0 1 2 3 4 5 6 7 8 9 10 0002 00 I 2nd subtelegram on filehandler E KK Status ADB DBN DBL xx 00 0000 0003 0 1 2 3 4 5 6 7 8 9 10 0002 F4H 00 11 to 254 Data 244 bytes Acknowledgment Con t File entries data E KK KI ADB DBN DBL xx 00 0000 0003 0 1 2 3 4 5 6 7 8 9 10 0003 00 I 3rd subtelegram on...

Page 36: ...eleased and becomes avail able for other MDS operations DELETE does not erase old user data A delete protected file cannot be deleted it must have its delete protection attribute removed using the ATTRIB command before it can be deleted Telegram to the file handler D CC CI ADB DBN DBL xx 00 0000 0001 0 1 2 3 4 5 6 7 8 9 10 0001 08H I 11 18 F name Name of file to be deleted 8 ASCII characters 20H 7...

Page 37: ...g checksums by accessing the data carrier An illegal command is rejected with error message D022 2 If the superuser wants to format the MDS or delete set up files he she must first open the data carrier again with the COVER command 3 A COVER command for an unformatted MDS is rejected with error D015 4 Specification of a volume name i e MDS name with the COVER command ensures that a data car rier m...

Page 38: ...0 no attribute 01 read only 02 write once over writing not possible 04 Fixed length The length cannot be changed with write commands 05 Same as 04 The file may only be read 00 0001 36 33 35 xxxx FILE1 00 Further file entries MDS related data A data record with the form as shown is transmittedto the user Free memory space in MDS in bytes 4 bytes hex Check sum calculated by file handler via DIR and ...

Page 39: ... incremented by 1 at each SLG station before being processed for the first time 00 0001 28 29 31 Type Free DIR entries Current count of free directory entries This number of further files can be opened 16 bits hex Current free capacity Free or not yet reserved memory capacity on the MDS 24 bits hex MDS capacity Max size of the user data area in the MDS in bytes 24 bits hex Free cap DIR Ind BZ ECC ...

Page 40: ...0 0001 0 1 2 3 4 5 6 7 8 9 10 0001 00 I Acknowledgement S CC Status ADB DBN DBL 00 xx 0000 0001 Vers no Last instruction Connection status 0 1 2 3 4 5 6 7 8 9 10 11 18 19 44 71 Status information regarding state of SLG hardware 24 V supply present fuse OK cable to SLG OK SLG OK 00H Connectionto SLG is OK 01H Fault in connection to SLG 26 bytes byte 0 to byte 25 of the acknowledge ment of the last ...

Page 41: ... Telegram to the file handler T CC CI ADB DBN DBL xx 00 0000 0001 0 1 2 3 4 5 6 7 8 9 10 0001 06 I Start addr xxxxxxH 11 13 Length 14 16 xxxxxxH Length of the data to be read 3 bytes hex Physical start address in the MDS of the data to be read 3 bytes hex Acknowledgement T CC Status ADB DBN DBL 00 xx 0000 0001 0 1 2 3 4 5 6 7 8 9 10 0001 xx 00 Data 11 254 Data If data length telegram length the fi...

Page 42: ...ile 00H no attribute for the data entered or delete existing attribute 01H attribute read only The file can only be read no DELETE or WRITE or UPDATE permissible 02H attribute write once The file can be written once and then only read DELETE or WRITE or UPDATE not permitted 04H attribute fixed length The length of the file cannot be changed by write commands such as UPDATE WRITE or APPEND i e the ...

Page 43: ... 2 3 4 5 6 7 8 9 10 0001 00 I Acknowledgement N CC Status ADB DBN DBL 00 xx 0000 0001 0 1 2 3 4 5 6 7 8 9 10 0001 00 00 It is essential to program the NEXT command for the following types of entry exit checking EAKO MDS recognition by field scanning EAKO 0 see section 5 1 MDS control via 1 DI EAKO 2 and field scanning see section 5 3 MDS control via 2 DI EAKO 3 see section 5 4 The NEXT command doe...

Page 44: ...mal SLG no Important Each SLG in a system must have a different SLG number FFFF Test function The next MDS can be the same one despite the NEXT com mand 0 ECC disabled default 1 ECC mode A description and function of ECC error correction code can be found in the FB 250 description Prior Block length 13 17 Type of entry exit checking 1 byte ASCII 0 MDS recognition by field scanning NEXT command is ...

Page 45: ...hich starts to function the single blinking of the red LED ceases and the yellow LED must come on if the connection to the SLG is OK The RESET command is required when a command or a sequence of telegram blocks is to be aborted If a command is terminated by the file handler with an error no RESET command is necessary Please note A RESET command declares the current MDS directory on the ASM to be i...

Page 46: ...l transport speed The file handler checks the directory transmitted by the L command for plausibility Check sums and di rectory data must correspond If this is not the case the user receives the error message D007 in the acknowledgement The file handler continues to function normally despite this error message The direc tory transmitted by the L command will be rejected The file handler reads the ...

Page 47: ...non volatile memory battery buffered or magnetic media Telegram to the file handler M CC CI ADB DBN DBL 00 xx 0000 0001 00 0 1 2 3 4 5 6 7 8 9 10 I 0001 The length of the DIR FAT data can vary It will be at its maximum when the maximum number of files has been created and the whole MDS is full of data Length DIR FAT 2 bytes Byte 11 12 of the telegram are already counted in the length M CC Status A...

Page 48: ...R procedure see section 3 1 If the user receives a start up message during operation the 24 V supply has failed for a short period A previously programmed command will no longer be processed by the file handler 3 5 2 Change in proximity status A change in proximity status Z message will only be signalled by the file handler if this has been specified by setting the DIL switch on the module see sec...

Page 49: ...ready or switched off the mes sage will be lost As a result the red LED flashes 28 times The ASM now always expects to receive a RESET telegram containing the relevant parameters from the user see section 3 4 15 Any other telegram will not be processed and will be rejected with an error Following the RESET the ASM is able to process all the commands described in section 3 4 Cold start and restart ...

Page 50: ...from the ASM to the user at any time e g following a short power fail ure To ensure stable operation the user must always be in a position to accept and evaluate the incom ing telegram Telegram received from ASM Yes No Start up message Correct acknowledgement evaluation of telegram Proximity message Z telegram Was command active on the ASM Yes No Send RESET telegram to ASM and fetch acknow ledgeme...

Page 51: ...S the station specific SLG number is written to the system area of the MDS The SLG number is written automatically before the first command to be executed on the MDS The file handler recognizes from the SLG number whether a new or an old data carrier is cur rently present in the transmission window of the SLG New MDS SLG numbers SLG no on MDS and station specific SLG no do not correspond Old MDS S...

Page 52: ...ion is handled by the pro cessor on the ASM Read write commands are handled completely transparently by the ASM and have no effect on proximity detection MDS SLG B a b L Hysteresis field for Transmission window Data exchange between MDS and SLG proximity detection h b c h 0 1 15 mm depends on MDS type L B Dimensions of the transmission window of an SLG read write device at operational distance to ...

Page 53: ...ximity switch I that an MDS is guaranteed to be present in the transmission window of the SLG before an MDS command is sent to the ASM Any com mand now sent to the ASM will be executed immediately If the ASM 421 does not find an MDS presence bit 0 the command will immediately be terminated with an error This also occurs if the MDS is defec tive No NEXT command is required when MDS processing is co...

Page 54: ...rection of movement of MDS MDS Prox switch on DI 0 Computer or PC ASM 421 SLG ÉÉ ÉÉ The entry of an MDS is detected by a proximity switch connected to DI 0 The switch should be positioned so that the MDS is guaranteed to be in the transmission window if the switch is activated If this is not the case or if the MDS is defective an error will be reported After processing the MDS it is imperative tha...

Page 55: ... anywhere between points A and E without causing an error When the MDS reaches point A exit the ASM 421 receives an impulse via DI 1 The ANW bit is reset The MDS has passed the Exit e a The distances from the SLG to the entry and exit proximity switches can largely be chosen at will by the user Note however that two MDSs can never be between points E and A at the same time After processing each MD...

Page 56: ...movement of MDS MDS Prox switch II ÉÉ ÉÉ ÉÉ Computer or PC ASM 421 SLG Dig inputs ANW In this mode of operation the user assumes control of the MDS Proximity switch I signals to the computer that an MDS has entered The MDS does not have to be within the transmission window of the SLG at this time Command processing begins as soon as the MDS enters the transmission window The user can check this by...

Page 57: ...ied out by the file handler The MDS control must be handled entirely by the user If a command is issued to the file handler it will be stored until an MDS arrives in the transmission window of the SLG The file handler then commences the processing of the command When executing com mands that do not change the DIR FAT structure i e no change to the checksum the system area is not updated This incre...

Page 58: ...The file switch is to be read dynamically by the SLG The computer sets a switch points and then waits for the next MDS 1 After a Restart and a RESET command from the user the file handler writes the SLG no to the MDS and goes into status 3 ANW bit 1 2 The user sends the READ switch command to the ASM The file handler starts the com mand and changes to status 27 3 After executing the command the AS...

Page 59: ...MMAND ARRIVES COMMAND COMPLETE COMMAND ARRIVES OLD MDS ARRIVES OLD MDS DEPARTS NEW MDS ARRIVES NEW MDS DEPARTS START COMMAND WRITE SLG NO START COMMAND NEW MDS BECOMES OLD MDS WRITE SLG NO START COMMAND NEW MDS BCOMES OLD MDS MDS DEPARTS EAKO 0 2 3 OLD MDS ARRIVES NEW MDS ARRIVES WITH EAKO 1 4 ACKNOWLEDGE NEXT WRITE SLG NO NEW MDS BECOMES OLD NEW MDS ARRIVES WITH EAKO 0 2 3 COMMAND ARRIVES WITH EA...

Page 60: ...D file A is sent to the ASM and is started by the file handler Status 27 4 Acknowledgement of command READ file A sent to the user status 3 5 Command READ file B to ASM status 27 6 Acknowledgement of command READ file B sent to the user status 3 7 Command WRITE file C to ASM status 27 8 Acknowledgement of command WRITE file C sent to the user status 3 The user has now completed the processing of t...

Page 61: ...1 1 ms byte 19200 Bd 0 6 ms byte File handler processing time ASM 421 processor run time This is very short and can generally be ig nored 1 msec Data transmission between file handler and MDS The gross data rate is 19200 baud Net data rate as shown in the following table PC ASM 421 SLG MDS K tB Oper type Memory 60 1 FH 32 2KB R S L 140 1 4 FH 8 KB E L 140 3 8 FH 8 KB E S 140 2 6 FH w ECC 32 2KB R ...

Page 62: ...nsmission of the command to the ASM 25 user bytes 6 procedure bytes response times in PC set to zero 3 File handler processing time 4 Processing time of the MDS by the file handler a on the first occasion when the MDS directory does not yet exist in the ASM b reading of 244 bytes file data 60 ms n 1 ms 5 Transmission of data to the PC 244 11 bytes user data 6 procedure bytes the acknowledgement ti...

Page 63: ...mand Error code When terminated within a block sequence the block in which the error was detected is shown here A block sequence will automatically be interrupted by an error Error flag is set Bit 0 in status byte 1 The error flag must always be interrogated by the user Command code showing where the error occurred In general An error terminates block creation There are no ignore or retry options ...

Page 64: ...initialize MDS C0 13 FORMAT timeout C0 14 FORMAT not initialized C0 15 CMD address error C0 16 ECC error C0 17 General driver error D0 01 Only RESET command permissible D0 05 Invalid file or volume name D0 07 The directory specified in the LOAD command is invalid MOVE command isn t possible D0 09 Incorrect parameter in RESET command D0 14 CREATE and WRITE the user data area in the MDS is full D0 1...

Page 65: ...SLG MDS 507 dialog battery is dead Batt2 bit is not set measure battery voltage EAKO 0 2 3 the old current MDS is out of the transmission window and the next new MDS has entered the transmission window A command has been started not NEXT This command refers to the new MDS but the old current MDS has not been terminated with NEXT a new MDS entered the transmission window of the SLG and left it agai...

Page 66: ...8 Field interference at the SLG The SLG is receiving interference impulses from the surround ing area external interference field the interference field can be detected by the inductive field indicator of the STG the distance between two SLGs is too small and does not conform to the design guidelines the connection cable to the SLG is subject to interference is too long or does not conform to spec...

Page 67: ...tion can only be remedied by a RESET command D0 05 The FORMAT CREATE ATTRIB WRITE UPDATE COVER and QUEUE WRITE com mands have been issued with incorrect parameters FORMAT with invalid volume name or MDS type CREATE with invalid file name invalid file attribute WRITE UPDATE with length 0 DLNG 0 QUEUE WRITE with invalid option COVER with invalid user Only 1 and 2 are valid D0 07 The data transferred...

Page 68: ...must be reformatted F0 01 Incorrect address with TRACE command the file addressed by a command e g WRITE does not exist in the directory The file must be created with CREATE check file name perhaps not in ASCII format F0 05 Attempt to write WRITE command to a read only file protected by an appropriate attri bute change the access rights with the ATTRIB command and then issue the WRITE DELETE UPDAT...

Page 69: ...rage media 1 Should you not be in possession of the MOBY catalog it can be obtained through your local Siemens office Warning English Beim Betrieb elektrischer Geräte stehen zwangsläufig bestimmte Teile dieser Geräte unter gefährlicher Spannung Sicherer Betrieb der Geräte setzt voraus dass diese von qualifizier tem Personal sachgemäß unter Beachtung der im MOBY Katalog1 und der technischen Beschre...

Page 70: ... C o incen diare la batteria oppure mettere il suo contenuto a contatto con acqua Nel caso di un supporto dati resistente al calore è necessario osservare le indicazioni speciali al riguardo 1 Se non doveste essere in possesso del catalogo MOBY potete ordi narlo presso qualsiasi filiale SIEMENS di zona Español Svensk Precaución Durante el funcionamiento de los equipos eléctricos hay partes de los ...

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