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Rice Lake SCT20-AN, Technical Manual

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SCT Weight Transmitter – 20 Series Technical Manual

18

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www.RiceLake.com

2.4.1

 

8

1
7

1

8

1
7

1

8

1
7

1

SCT

SCT

SCT

RS48

5 +

R

S

485  -

   

  

  

   

  

  

          

  max 500 m

RS485 +

RS485 -

 PC RS232

RX+

 

RX- 

TX-

TX

+

Converter

24 Vcc

+

-

0

TX

RX

VI

N

RS

4

8

5  +

R

S

485  -

RS

4

8

5 te

rmination

20

2

0

0 VDC

20

 

RS485 +

RS485 -

0 VDC

RS485 +

RS485 -

0 VDC

5   2   3

If the device is labeled A and B
Connect A to RS485-
Connect B to RS485+

RS-485 Serial Communication

Figure 2-4. RS-485 Serial Communications

Note

If the RS-485 network exceeds 100 meters in length or a baud rate over 9600 is used, close the two jumpers, called 

RS-485 termination, to activate two 120 ohm terminating resistors between the ‘+’ and ‘–’ terminals of the line, on the 

terminal strip of the furthest instrument. Should there be different instruments or converters, refer to the specific 

manuals to determine whether it is necessary to connect the above-mentioned resistors.

Direct Connection Between RS-485 And RS-232 Without Converter
Since a two-wire RS-485 output may be used directly on the RS-232 input of a PC or remote display, it is possible to implement 

instrument connection to an RS-232 port in the following manner:

Instrument

RS-232

RS-485 -

RXD

RS-485 +

GND

Table 2-8.  Connection Between RS-485 and RS-232

Summary of Contents for SCT20-AN

Page 1: ...SCT Weight Transmitter 20 Series Technical Manual PN 131128 Rev F June 26 2018...

Page 2: ...marks of their respective companies All information contained within this publication is to the best of our knowledge complete and accurate at the time of publication Rice Lake Weighing Systems reserv...

Page 3: ...n 10 2 1 2 Theoretical Calibration 11 2 1 3 Maximum Capacity NASS 12 2 1 4 Zero Setting 12 2 1 5 Zero Value Manual Entry 12 2 1 6 Weight Span Calibration With Test Weights 13 2 1 7 Setting Units of Me...

Page 4: ...o Weight Zero setting For Small Variations 29 3 4 Peak 29 3 5 Alarms 30 3 6 SCT20 DN DeviceNet 31 3 7 PROFIBUS 33 3 8 SCT20 IP EtherNet IP 37 3 8 1 Single Port Ethernet IP Interface 37 3 8 2 Double Po...

Page 5: ...operate or work on this equipment unless this manual has been read and all instructions are understood Failure to follow the instructions or heed the warnings could result in injury or death Contact a...

Page 6: ...n rigid stable structures within 0 5 of plumb and level It is important to use the mounting modules for load cells to compensate for misalignment of the support surfaces Use waterproof sheaths and joi...

Page 7: ...ce The value between the positive excitation wire and the negative excitation wire must be equal or similar to the one indicated in the load cell data sheet input resistance The insulation value betwe...

Page 8: ...llows the device to exchange the main system parameters with a DeviceNet primary The PROFIBUS Option has a PROFIBUS DP V0 Source port that allows the device to exchange the main system parameters with...

Page 9: ...0 on page 24 EXCITATION EXCITATION 4 wire load cell connection SHIELD SIGNAL SIGNAL 1 2 3 4 5 6 RS485 Relay Outputs 115Vac 150mA 12 24Vdc SIGNAL EXCITATION SHIELD EXCITATION SENSE SENSE Inputs 5 24Vdc...

Page 10: ...inks quickly DeviceNet OK Blinks slowly about 0 5s Initialization LED lighted source not initialized LED off DeviceNet KO PROFIBUS Model LED Function PROFIBUS Status Blinks quickly PROFIBUS OK Blinks...

Page 11: ...o indicate that a setting and not a weight is being viewed After pressing the first digit flashes and can be edited For numeric entries press to select desired digit then press to increment the digit...

Page 12: ...e 19 DeviceNet Model Section 2 5 on page 19 Ethernet Model Section 2 8 on page 21 PROFIBUS Model Section 2 7 on page 20 Modbus TCP Section 3 10 on page 42 7 If using serial communication set the relat...

Page 13: ...erial Communications settings Section 2 4 on page 16 DeviceNet options for outputs and inputs configuration Section 2 10 on page 24 Table 2 1 Configuration Parameters W 6W 2XW Q Q 2XW 18 Enter DeviceN...

Page 14: ...scription FS tEO System Full Scale determined by multiplying one load cell capacity by the number of load cells used Example of system full scale value calculation 4 cells of 1000 kg FULL SCALE 1000 X...

Page 15: ...scale contains product that cannot be removed the value entered is the dead load this value is replaced if the zero function is performed Weight Span Calibration after the theoretical calibration is...

Page 16: ...ifferent the calibration in use is the Weight Span Calibration based on test weights By modifying the theoretical full scale the sensitivity or divisions and all the system s parameters containing a w...

Page 17: ...Press twice to exit set up menu IMPORTANT Example For a system of maximum capacity of 1000 kg and 1 kg division two test weights are available one 500 kg and one 300 kg Load both weights onto the syst...

Page 18: ...ll be modified according to the coefficient When the input is opened the standard weight display will be restored 1 Press and hold then press to enter set up menu will be displayed 2 Press is displaye...

Page 19: ...is used to stabilize a weight as long as the variations are smaller than the corresponding Response Time The filter setting is dependent on the type of application and the required update rate See Ta...

Page 20: ...of full scale Automatically zeros the scale at power on If the weight value is lower than the value set in this parameter the scale will zero itself provided the weight does not exceed the value in th...

Page 21: ...t transmission protocol see Section 3 14 Set BAUD 9600 PARITY none STOP 1 When the remote display is set to gross weight if the instrument displays the gross weight the remote display shows the gross...

Page 22: ...d rate over 9600 is used close the two jumpers called RS 485 termination to activate two 120 ohm terminating resistors between the and terminals of the line on the terminal strip of the furthest instr...

Page 23: ...See Section 2 6 1 for more information See Section 2 6 1 for more information Select the mode to be tracked gross or net If the net function is not active the analog output varies according to gross...

Page 24: ...splayed 3 Press is displayed Press 4 Press or until desired value is displayed Press 5 Press twice to exit set up menu Table 2 12 PROFIBUS Parameters Parameter Options Description r 1 99 Set instrumen...

Page 25: ...is displayed Press 5 Press twice to exit set up menu Figure 2 7 SCT20 IP Menu Structure Table 2 13 SCT20 IP Menu Parameters Parameter Options Description Little Endian Big Endian Allows selection of r...

Page 26: ...nued Continuous weight transmission protocol streams net and gross including decimal See Section 3 14 on page 53 Set BAUD 9600 PARITY none STOP 1 Continuous weight transmission protocol Section 3 14 o...

Page 27: ...cted See Figure 2 3 on page 16 20Hz Max setting with min 2400 baud rate 30Hz 40Hz Max setting with min 4800 baud rate 50Hz 60Hz 70Hz 80Hz Max setting with min 9600 baud rate 100Hz Max setting with min...

Page 28: ...s of weight but is controlled by remote Modbus protocol commands Devi ceNet PROFIBUS Ethernet Only dEunEt The contact will not switch on the basis of weight but is controlled by DeviceNet DeviceNet Mo...

Page 29: ...tpoint 0 and nodes pos relay switching occurs for a weight higher than or equal to 0 the relay will switch again for values below 0 taking hysteresis into account Setpoint 0 and nodes neg relay switch...

Page 30: ...s are set to zero if the calibration is changed significantly See Section 2 1 2 on page 11 and Section 2 1 6 on page 13 Parameter Options Description Full Scale Setpoint relay switching occurs when th...

Page 31: ...king 1 Press and hold then press is displayed 2 Press or until menu to be temporarily unlocked is displayed 3 Press and simultaneously for 3 seconds the display shows The decimal point between the fir...

Page 32: ...ny changes and without deleting any of the set variables If necessary a manual for the newly set program can be requested it from Rice Lake Weighing Systems Technical Support 2 13 7 Keypad Or Display...

Page 33: ...ights up to show that a tare has been entered Note Press and hold for three seconds to display the gross weight temporarily When is released the net weight will be displayed again Note To delete a pre...

Page 34: ...999 or less than 999999 Note DeviceNet Error DeviceNet Models Only A problem in the DeviceNet communication is marked by a lack of flashing or a slow flashing duration about 0 5 s of the DeviceNet sta...

Page 35: ...bout sign and possible errors on the weight Setpoints The Setpoints are weight values expressed as positive integer numbers including decimal figures but without decimal point READING send to the Comm...

Page 36: ...et takes control of all the outputs even if they are in different modes Status Register Table 3 9 Status Register DeviceNet Bit No Description Bit No Description Bit 0 Cell Error Bit 8 Net weight nega...

Page 37: ...nd all the other bits are 0 To set them correctly consider the module Division value E g to set a set point to 100kg and the verification division value is 0 001 set the set point value to 100000 remo...

Page 38: ...9 Bit 2 Bit 10 Bit 3 Bit 11 Bit 4 Bit 12 Bit 5 Bit 13 Bit 6 Bit 14 Bit 7 Bit 15 Bit a 1 input high Bit a 0 input is low Least significant byte L Byte Division Most significant byte H Byte Units of Me...

Page 39: ...beyond 999999 or less than 999999 Bit 5 Net weight beyond 999999 or less than 999999 Bit 6 Bit 7 Gross weight negative sign Bit 8 Net weight negative sign Bit 9 Peak weight negative sign Bit 10 Net d...

Page 40: ...on value is 0 001 set the register value to 100000 remove the decimal points from the value that would be 100 000 with decimals To perform the edit calibration procedure 1 Using the command 100 Zero S...

Page 41: ...d in Section 3 8 1 Table 3 16 Manual Settings for Communication Field Read Write Service 0x0E 0x10 Class 0x04 0x04 Instance 0x65 0x64 Attribute 0x03 0x03 Data NO Byte array to be written 3 8 1 Single...

Page 42: ...90 Setpoint 1 reading 91 Setpoint 2 reading 92 Setpoint 3 reading 93 Setpoint 1 writing 94 Setpoint 2 writing 95 Setpoint 3 writing 98 99 Save data in EEPROM 100 Tare Weight Zero Setting for calibrati...

Page 43: ...in EEPROM to the command register Digital Inputs Status Bit a 1 input high Bit a 0 input is low Digital Outputs Status Table 3 23 Digital Output Status EtherNet IP Bit No Description Bit No Descripti...

Page 44: ...gn Bit 8 Net weight negative sign Bit 9 Peak weight negative sign Bit 10 Net display mode Bit 11 Weight stability Bit 12 Weight within of a division around ZERO Bit 13 Bit 14 Bit 15 3 9 SCT20 TCP IP E...

Page 45: ...ule to match the baud rate set in SCT20 TCP IP Protocol Selection default 9600 Do not change any other parameters Press Enter to confirm To connect to the SCT20 TCP IP using a socket for example Winso...

Page 46: ...nd it only works with Port 10001 Do not include the CR with the command Supports the same commands as ASCII See Section 3 12 on page 48 Protocol Selection To select the protocol to use on the Ethernet...

Page 47: ...writing of the registers listed in this section according to the specifications contained in the reference document for this standard Modicon PI MBUS 300 To select the communication with MODBUS RTU s...

Page 48: ...d Holding Registers Programmable Register Reading Table 3 27 Programmable Register Reading Modbus RTU Query Address Function Add Reg 1 No register 2 bytes A 0x03 0x0000 0x0002 CRC Tot bytes 8 Tot byte...

Page 49: ...col implemented on this instrument can manage a maximum of 32 registers read and written in a single query or response R the register can be read only W the register can be written only R W the regist...

Page 50: ...in the registers 40043 Weight value corresponding to the ZERO of the analog output H and 40044 Weight value corresponding to the ZERO of the analog output L After writing the value send the command 9...

Page 51: ...eded by 9 divisions Bit 10 Net display mode Bit 3 Gross weight higher than 110 of full scale Bit 11 Weight stability Bit 4 Gross weight beyond 999999 or less than 999999 Bit 12 Weight within of a divi...

Page 52: ...0 0 0 Kilograms Does not intervene 1 50 0 1 Grams Does not intervene 2 20 0 2 Tons Does not intervene 3 10 0 3 Pounds Does not intervene 4 5 0 4 Newton Multiples 5 2 0 5 Litres Divides 6 1 0 6 Bar Mul...

Page 53: ...ed 13 Reserved 14 Reserved 15 Reserved 16 Reserved 9999 Reset reserved Operation Rice Lake Weighing Systems All Rights Reserved 49 Possible Commands To Send To The Command Register 40006 3 12 ASCII Bi...

Page 54: ...upon instrument power off It is necessary to send a special command to save them permanently in the EEPROM memory Please note that the number of writes allowed in the EEPROM memory is limited about 1...

Page 55: ...n page 30 for more information on alarms Semi Automatic Zero Weight Zero Setting For Small Variations IMPORTANT The zero setting will not be maintained after an instrument power off The PC transmits a...

Page 56: ...to reset the weight quite often it is recommended to perform it by PC or PLC program keeping in mind the weight deviation respect to the zero instrument Weight Span Calibration With Test Weights Afte...

Page 57: ...k Sum Calculation The two ASCII control characters ckck are the representation of a hexadecimal digit in ASCII characters The check digit is calculated by performing the operation XOR exclusive or 8 b...

Page 58: ...instrument transmits in continuous mode the weight to remote displays the communication string is transmitted 10 times per second The communication modes available are Section 2 4 on page 16 remote d...

Page 59: ...Interface to Remote Display Remote Display Laser Light 1 Press and hold then press is displayed 2 Press or until is displayed 3 Press is displayed 4 Press is displayed 5 Press or until is displayed Pr...

Page 60: ...he string h01 h10 h00 h10 h00 h04 hC0 h0F Query Field Name Hex Response Field Name Hex Instrument Address h01 Instrument Address h01 Function h10 Function h10 Address of the first register H h00 Addre...

Page 61: ...0 Datum 1 L h00 Datum 2 H h07 Datum 2 L hD0 Datum 3 H h00 Datum 3 L h00 Datum 4 H h0B Datum 4 L hB8 CRC16 H hB0 CRC16 L hA2 Query Field Name Hex Response Field Name Hex Instrument Address h01 Instrume...

Page 62: ...tput 0 10 VDC 0 0 5 VDC 10 VDC 16 bit 65535 5 VDC min 10 kohm divisions Enclosure Dimensions W x H x D 0 98 x 4 52 x 4 72 in 25 x 115 x 120 mm Communications EtherNet IP Port RJ45 10Base T or 100Base...

Page 63: ...f Decimals 0 4 x 1 x 2 x 5 x 10 x 20 x 50 x 100 Display Increments Digital Filter Readings 0 060 7sec 5 300 Hz Analog per second DeviceNet 0 012 7 sec 5 300 Hz Ethernet PROFIBUS Relay Logic Outputs N...

Page 64: ......

Page 65: ...anada Mexico 800 321 6703 International 715 234 9171 Europe 31 0 26 472 1319 Rice Lake Weighing Systems is an ISO 9001 registered company Rice Lake Weighing Systems Specifications subject to change wi...

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