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13

HART Multiplexer Master KFD2-HMM-16

Product description

Subject to reasonable modifications due to technical advances.

Copyright Fuchs, Printed in Germany

Fuchs Group • Tel.: Germany (06 21) 7 76-0 • USA (330) 4 25 35 55 • Singapore 7 79 90 91 • Internet http://www.pepperl-fuchs.com

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2.1.11

Connection to the service station (PC, DCS/Process control system)

The connection to the service station or to the control system is made via a multidrop able RS 485 interface. 
The baud rate of this interface can be set to 9600, 19200 or 38400 baud via the DIP switches 2 and 3 (see 
section 2.1.12). The device address for the communication via RS 485 is set by the DIP switches 4 to 8 (see 
section 2.1.12).

2.1.12

DIP switch settings

8 DIP switches are located on the top of the device. DIP switch 1 is used by the manufacturer for testing the 
device and must therefore always be set to "OFF".

DIP switches 2 and 3 determine the baud rate of the RS 485 interface.

DIP switches 4 to 8 determine the RS485 address. A value is assigned to each of the individual DIP 
switches for this purpose. The resulting address is given by the addition of the set values.

Condition on delivery

When setting the address, care should be taken to ensure that no address is assigned more 
than once, since this can lead to communication errors or even communication failure.

The adjusted baud rate must comply with the service station.

DIP switch

1

Meaning

Setting

OFF Normal status (LED test de-activated)

ON LED test activated; all three LEDs flash one after the other

DIP switch

2

3

Meaning

Setting

OFF OFF 9600 Baud

OFF ON 19200 Baud

ON OFF 38400 Baud

ON

ON Not permitted

DIP switch

4

5

6

7

8

Meaning

Setting

ON

Value 16

ON

Value 8

ON

Value 4

ON

Value 2

ON Value 1

Example:

OFF ON

ON OFF ON address = 8 + 4 + 1 = 13

To accept the values set on the DIP switches, the device must be isolated briefly from power 
supply.

DIP switch

1

2

3

4

5

6

7

8

Meaning

Setting

OFF OFF OFF OFF OFF OFF OFF OFF

Manufacturer test de-activated
Baud rate 9600 baud
RS 485 address 0

The address 0 is set on the device when delivered. Care should be taken that no address is 
assigned more than once.

Содержание KFD2-HMM-16

Страница 1: ...Manual KFD2 HMM 16 PROCESS AUTOMATION PEPPERL FUCHS HART Multiplexer Master BA268F 00 en 02 03 Part No 52017696 ...

Страница 2: ...by the Zentralverband Elektrotechnik und Elektroindustrie ZVEI e V in its most recent edition as well as the supplementary proviso Extended property proviso are applicable We at Pepperl Fuchs feel obligated to contribute to the future this publication is therefore printed on paper bleached without the use of chlorine ...

Страница 3: ...nce 11 2 1 8 Operation 11 2 1 9 LED indicators 12 2 1 10 Device parameter parameterisation 12 2 1 11 Connection to the service station PC DCS Process control system 13 2 1 12 DIP switch settings 13 2 1 13 Connection and Connection Assignment of RS 485 14 2 2 Description of the HART communication 15 2 3 System construction 16 2 3 1 System description 16 2 3 2 Service station 16 2 3 3 Integration in...

Страница 4: ...sue 29 11 2000 4 COMMISSIONING 23 4 1 Commissioning check list 23 4 2 Data access to the connected transmitters 23 5 DIAGNOSIS AND FAULT ELIMINATION 24 5 1 General 24 5 2 LEDs 24 5 3 Status Response code Response code 24 5 3 1 General 24 5 3 2 Structure of the first byte 24 5 3 3 Device status structure of the second byte 26 5 4 Extended device status 27 6 APPENDIX 28 6 1 Supported commands 28 6 2...

Страница 5: ...via an R S485 interface This symbol warns of danger If the instruction given in this warning is not heeded the result could be the injury or death of personnel and or the severe damage or destruction of equipment This symbol advises of a possible failure If the instruction given in this warning is not heeded the device and any plant or systems connected to it could develop a fault or even fail com...

Страница 6: ...ures the user must make himself ac quainted with the equipment and must have read and understood the manual before undertaking its instal lation and commissioning 1 5 Marking The following identification is affixed to the KFD2 HMM 16 multiplexer Pepperl Fuchs GmbH D 68307 Mannheim KFD2 HMM 16 TÜV 00 ATEX 1547 X II 3G EEx n A II T4 Repairs to the device must only be undertaken by specialist personn...

Страница 7: ...T multiplexer can operate up to 256 analogue transmitters The built in slave unit operates the first 16 loops and a maximum of a further 15 KFD0 HMS 16 slaves can be connected The external connections are shown in Figure 2 1 and Figure 2 2 The power supply 2 4 VDC nominal voltage is provided via the power rail or terminals 17 and18 The op tional slave units or the RPI control module are connected ...

Страница 8: ...e of issue 29 11 2000 Figure 2 1 Block diagramm KFD2 HMM 16 Figure 2 2 Location of the plug connectors and controls and the indicators of the KFD2 HMM 16 26 pin connector for up to 16 analog signal sources 14 pin connector for up to 15 KFD0 HMS 16 devices Micro processor Multiplexer Power supply Power Rail RS 485 Repeater 17 18 13 14 15 19 20 21 grd T T Front view LED red Fault signal 26 pin conne...

Страница 9: ...aces with screw terminals are available for the purpose of individual wiring 2 1 6 Device function Channel number The HART multiplexer master KFD2 HMM 16 provides 16 channels for the connection of smart transmit ters or control devices which support digital communication in accordance with the HART specification A maximum of 15 additional KFD0 HMS 16 slaves can be connected each of which in turn s...

Страница 10: ...se This can be used to intermediately store a message the command for which requires a long execution time Loop construction REBUILD Software function On power up the device searches the multiplexers in the multiplexer table for the connected HART field devices commands 0 and 41 and generates the internally required access tables This function can also be carried out by the connected service stati...

Страница 11: ... loops per interface Automatic search of all existing HART field devices REBUILD Facility for self standing cyclic interrogation of the HART variables SCAN Acts as a primary or secondary master Fast RS 485 interface multidrop with up to 38400 baud Integrated Modem Removable terminals Supply via power rail Approval for zone 2 2 1 7 Start up sequence Following connection of the power supply the devi...

Страница 12: ...on 5 3 2 The range of adjustment is 0 11 repeats In the case of communication errors the pre setting is 2 in the case of the response code Busy it is 0 SCAN command see section 2 1 6 and commands 146 and 147 Of the available SCAN parameters only the SCAN command is stored by non volatile means It signifies which HART command 1 2 or 3 is to be sent to the transmitter as the SCAN command Master type...

Страница 13: ...rface DIP switches 4 to 8 determine the RS485 address A value is assigned to each of the individual DIP switches for this purpose The resulting address is given by the addition of the set values Condition on delivery When setting the address care should be taken to ensure that no address is assigned more than once since this can lead to communication errors or even communication failure The adjust...

Страница 14: ... connection of a terminating resistance The terminating resistor terminates the cables with its characteristic impedance At minimal baud rates and with short lengths of cable in practice quite often no terminating resistors are used If communication errors arise or if these are to be positively excluded from the outset terminating resistors typically of 120 Ω 220 Ω should be used Such can for exam...

Страница 15: ... field device does only respond when requested except in Burst mo de The message duration is several hundred milliseconds so that between two and three messages can be transferred per second On HART there are three groups of commands The Universal commands these must be supported by all field devices the Common practice commands these are pre defined commands suitable for many field devices which ...

Страница 16: ...FD2 STC4 Ex2 smart current repeaters and KFD2 SCD Ex1 32 KFD2 SCD Ex1 LK smart isolated transformers Similarly the HART multiplex system can also be connected to other smart Ex isolation stages This means that existing systems can be expan ded very easily thus taking full advantage of the HART communication system The system comprises a max of 31 HART multiplexer masters which are connected to the...

Страница 17: ...e slave address 0 Under these slave units there are the HART compatible field devices 2 3 4 System construction with and without multiplexer slaves In a system structure without multiplexer slaves only one multiplexer master is used The arrangement is restricted to 16 HART channels With two to three messages per second the system cycle time can be up to one minute In a system structure with multip...

Страница 18: ...ield devices are provided as screw terminals or in the form of Pepperl Fuchs system connectors for cable tree installa tion The connections for the control system are likewise either provided as screw terminals or as control system specific connectors Such a system is presented in Figure 2 5 The distinguishing characteristics of the FI in detail Power feed option also redundant switchable for each...

Страница 19: ... connection to the control system Such a system is shown in Figure 2 6 The distinguishing characteristics of the MB in detail Power feed also redundant with fuses and LEDs 250 Ω resistance Control system specific connector also redundant Control system specific arrangement of the Ex isolation modules Number and type Figure 2 6 System with motherboard KFD2 STC4 Ex2 PWR 7 8 10 13 14 1 23 4 KFD2 STC4...

Страница 20: ...n the KFD2 HMM 16 different addresses must be assigned The sequence therefore plays no role in this The analogue signals are fed via a 26 core flat cable into the KFD0 HMS 16 16 of these are intended for the HART signal of the analogue instrument circuit the remaining 10 are to ground for the assignment see section 6 2 The minimum load resistance of the analogue measuring circuit is 23 0Ω minimum ...

Страница 21: ...tallation options are described in the accompanying product information about the K System KFD series 3 4 Electrical connection 3 4 1 General notes for connection 3 4 2 Location of electrical connections The power supply 24 V DC nominal voltage is provided via the power rail or terminals 1 7 and1 8 The device is protected against reverse polarity by means of a protection diode The connection of a ...

Страница 22: ...uctive and earthed control cabinets Leads that are fed into the control cabinet should be screened and the screen should be connected with the control cabinet at the point of entry preferably directly in the cable gland Unscreened leads in the control cabinet e g power supply leads should be fed via filters 3 5 Dismantling packaging and disposal When dismantling the device keep it in the original ...

Страница 23: ... the polarity of the R S485 connection see section 2 1 13 Operation Wait for the start up sequence to finish see section 2 1 7 Start the parameter assignment see section 2 1 10 in particular establish the position of the multiple xers that are being used in the module table see section 2 1 6 Carry out the loop construction REBUILD see section 2 1 6 Activate the SCAN function if required see sectio...

Страница 24: ...tion is coded bit by bit If bit 7 is cleared 0 the first status byte contains a summary of the command responses This information is numbered consecutively and not coded bit by bit Communication error This byte contains information concerning the reception of a message The individual bits indicate a detected error which has resulted in non acceptance of the message Thus neither can a response be g...

Страница 25: ...lowing response codes can occur on the multiplexer Bit Meaning 7 6 5 4 3 2 1 0 1 Communication error if bit 7 1 coded bit by bit 1 1 Parity error 1 1 Overrun error 1 1 Message error 1 1 Checksum error 1 0 Always 0 reserved 1 1 Input buffer overrun 1 1 undefined Details can be found in 1 All the codes that occur on the HART system are described in 1 Code Description Meaning Can occur with commands ...

Страница 26: ...rovide further information see section 5 4 Read extended device status section 5 4 Check LEDs section 5 2 Re parameterise device 6 Configuration changed Configuration changed A write command has been execu ted This bit can be cleared by com mand 38 5 Start up sequence is running The power supply has been con nected or a reset has been activa ted Transient data are reset to the preset values Wait f...

Страница 27: ...ltaneously The bit by bit coded information is shown in the following table Bit Operation in progress Meaning 7 Reset Start up sequence running and must be completed 6 REBUILD REBUILD function is running and must be completed 5 Internal EEPROM write function Switching off the power supply can result in loss of the parameter assignment 4 SCAN SCAN function is running and must be completed 3 Self te...

Страница 28: ...ead unique identifier 12 bytes device identifier are given in the response 1 Read HART variables process values Commands are only supported for compatibility purpo ses and are without any meaning Used with transmitters e g SCAN function they have the following meanings 1 Read primary variable 2 Read primary variable as current in mA and percent of range 3 Read primary variable as current in mA and...

Страница 29: ...the status of the current loop can be read out The following information is supplied Hardware fault Rebuild running for this loop SCAN activated for this loop Searching transmitter due to disappeared Transmitter not responding disappeared Transmitter responding again appeared An other transmitter responded instead mismat ched 130 Read transmitter list max 49 ent ries beginning with the given index...

Страница 30: ...Read the selected SCAN com mand During SCAN the HART commands 1 2 or 3 see above can be executed 147 Select SCAN command 148 Read SCAN status With these commands the status of the SCAN function is set or read respectively see section 2 1 6 0 SCAN function disabled default after power up 1 Normal SCAN function activated 2 Special SCAN function activated see 158 159 149 Write SCAN status 150 Read ma...

Страница 31: ...s For the given current loop and polling address has to be 0 the threshold data length 0 62 and the SCAN command to be used can be written 160 Read loop switch delay When the multiplexer switches the communication channel loop 0 255 it can insert a delay time 0 ms 300 ms before any HART commands are sent to the loop This is necessary when using the multiple xer together with the RPI product family...

Страница 32: ...reserved for 4m A 2 0mA analogue transmitters in point to point networks polling addres ses 1 15 for transmitters in multidrop networks Broadcast Mode Burst Mode Burst Mode A communication mode in which a master device instructs slave devices to continiously broadcast process values e g the primary variable until the master instructs it to stop The multiplexer recognizes and supports this mode but...

Страница 33: ...he bus access the primary master has a higher priority than the secondary master Messages sent by the masters are characterised by a master bit so that the masters can recognise which responses are intended for them Point to point In a point to point communcation system only two communicating devices are connected together to one segment pair of wires A point to point system is for example the mas...

Страница 34: ...easonable modifications due to technical advances Copyright Pepperl Fuchs Printed in Germany Pepperl Fuchs Group Tel Germany 06 21 7 76 0 USA 330 4 25 35 55 Singapore 7 79 90 91 Internet http www pepperl fuchs com Part No 109143 Date of issue 29 11 2000 ...

Страница 35: ...by the Zentralverband Elektrotechnik und Elektroindustrie ZVEI e V in its most recent edition as well as the supplementary proviso Extended property proviso are applicable We at Pepperl Fuchs feel obligated to contribute to the future this publication is therefore printed on paper bleached without the use of chlorine ...

Страница 36: ...lication Machine engineering Conveyor or transport Packaging and bottling Automotive industry Subject to reasonable modifications due to technical advances Copyright PEPPERL FUCHS Printed in Germany Part No Worldwide Headquarters Pepperl Fuchs GmbH Königsberger Allee 87 68307 Mannheim Germany Tel 49 621 7 76 0 Fax 49 621 7 76 10 00 http www pepperl fuchs com e mail pa info de pepperl fuchs com The...

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