Rice Lake SCT20-DN Technical Manual
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Rice Lake SCT20-DN Technical Manual

Sct 20 series. sct weight transmitter
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SCT Weight Transmitter
20 Series
Technical Manual
June 26, 2018
PN 131128 Rev F

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  • Page 1 SCT Weight Transmitter 20 Series Technical Manual June 26, 2018 PN 131128 Rev F...
  • Page 2 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 reserves the right to make changes to the technology, features, specifications and design of the equipment without notice.

  • Page 3: Table Of Contents

    Keypad Or Display Locking ..............28 Technical training seminars are available through Rice Lake Weighing Systems.
  • Page 4 4.0 Specifications ............... . . 57 Rice Lake continually offers web-based video training on a growing selection of product-related topics at no cost.

  • Page 5: Introduction

    Do not 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 any Rice Lake Weighing Systems dealer for replacement manuals.

  • Page 6: Equipment Recommendations

    SCT Weight Transmitter – 20 Series Technical Manual Equipment Recommendations Failure to follow the installation recommendations is considered a misuse of the equipment. IMPORTANT To Avoid Equipment Damage • Keep away from heat sources and direct sunlight. • Protect the instrument from rain. •...

  • Page 7: Load Cells

    Make sure it reads between 0 and 0.5 mV. • Apply load to the load cell and make sure that there is a signal increment. If one of the above conditions is not met, please contact Rice Lake Weighing Systems Customer Support for IMPORTANT assistance.

  • Page 8: Connectivity

    SCT Weight Transmitter – 20 Series Technical Manual Connectivity Analog Output (Current and Voltage) DC Power Other Options Supplier DeviceNet (12-24 Volt) PROFIBUS Ethernet Junction Box Serial Port RS-485 RS-232 MAX 8 Load Cells Modbus RTU In Parallel 3 Relay Outputs 2 Digital Inputs PLC or Field Signals (Opto-isolated,...

  • Page 9: Electrical Connections

    Modbus/TCP Figure 1-3. Wiring Diagram Three outputs: configurable setpoints or remote output management via protocol. Two inputs: default of SEMI-AUTOMATIC ZERO input 1; NET/GROSS input 2. See Section 2.10 on page © Rice Lake Weighing Systems ● All Rights Reserved...

  • Page 10: Led Functions

    SCT Weight Transmitter – 20 Series Technical Manual LED Functions Figure 1-4. Display Main Function Secondary Function * Net weight LED None Zero LED (deviation from zero not more than +/- 0.25 divisions) LED lit: output 3 closed Stability LED LED lit: output 2 closed Unit of measure: kg LED lit: output 1 closed...

  • Page 11: Key Functions

    4. Reset to zero. See Section 2.1.4 on page 5. Check the calibration with test weights and correct the indicated weight if necessary. See Section 2.1.6 on page © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 12 SCT Weight Transmitter – 20 Series Technical Manual 6. Set the desired output type and the full scale value. • Analog Output Model (Section 2.6 on page • DeviceNet Model (Section 2.5 on page • Ethernet Model (Section 2.8 on page •...

  • Page 13: Configuration

    Serial Communications settings (Section 2.4 on page       DeviceNet options for outputs and inputs configuration (Section 2.10    on page Table 2-1. Configuration Parameters © Rice Lake Weighing Systems ● All Rights Reserved...

  • Page 14: Calibration

    SCT Weight Transmitter – 20 Series Technical Manual Parameter Options Description   Analog options for outputs and inputs configuration  (Section 2.10 on page       PROFIBUS settings (Section 2.7 on page   SCT20-IP (EtherNet/IP) settings (Section 2.8 on page ...
  • Page 15 Multiplier Value – if entered, displays an alternative unit of measure if digital input is set for COEFF and is in a closed state   Table 2-2. Calibration Menu Parameters (Continued) © Rice Lake Weighing Systems ● All Rights Reserved...

  • Page 16: Theoretical Calibration

    SCT Weight Transmitter – 20 Series Technical Manual To calibrate the instrument, the theoretical calibration (Section 2.1.2 on page 11) must be completed first. After Note theoretical calibration is set, the scale can be set with actual weights (Section 2.1.6 on page 13).

  • Page 17: Weight (Span) Calibration (With Test Weights)

    (). © Rice Lake Weighing Systems ● All Rights Reserved...

  • Page 18: Setting Units Of Measure

    SCT Weight Transmitter – 20 Series Technical Manual 2.1.7 Setting Units of Measure 1. Press and hold , then press .  is displayed. 2. Press ,  is displayed. 3. Press until  is displayed. Press 4. Press until desired unit is displayed. Press twice to exit set-up menu.

  • Page 19: Filter On The Weight

    Response Time Display and Serial Port Refresh Frequency Filter Value [ms] [Hz] 12.5 1700 12.5 2500 12.5 4000 6000 7000 Anti-peak * Indicates default value. Table 2-5. Filter Values © Rice Lake Weighing Systems ● All Rights Reserved...

  • Page 20: Zero Parameters

    SCT Weight Transmitter – 20 Series Technical Manual Zero Parameters 1. Press and hold , then press .  is displayed. 2. Press until  is displayed. Press 3. Press until desired parameter is displayed. See Table 2-6 . 4. Press .
  • Page 21 Delay in milliseconds which elapses before the instrument replies * nOnE* * parity none  EUEn even parity odd parity 1* * Stop bit  * Indicates default value. Table 2-7. Serial Communications Menu Parameters © Rice Lake Weighing Systems ● All Rights Reserved...

  • Page 22: Rs-485 Serial Communication

    SCT Weight Transmitter – 20 Series Technical Manual 2.4.1 RS-485 Serial Communication 0 VDC RS485 - RS485 + 0 VDC RS485 - RS485 + If the device is labeled A and B Connect A to RS485- Connect B to RS485+ 0 VDC RS485 - RS485 +...

  • Page 23: Sct20-Dn (Devicenet™) Settings

    (default: calibration full scale). Example: if using a 4-20 mA output and in the PLC program a 20 mA = 8000 kg is desired, set the parameter to 8000. Table 2-10. Analog Menu Parameters © Rice Lake Weighing Systems ● All Rights Reserved...

  • Page 24: Soldered Jumper

    SCT Weight Transmitter – 20 Series Technical Manual Parameter Options Description Analog output correction to zero: if necessary adjust the analog output, allowing the PLC to indicate 0. The sign ‘-‘ can be  set for the last digit on the left. Example: for a 4-20 mA output and a minimum analog setting, the PLC or tester reads 4.1 mA.

  • Page 25: Sct20-Ip (Ethernet/Ip™) Settings

     Set IP address in the EtherNet/ IP™ network. *  Set Subnet mask *  Set the Gateway address * * Indicates default value. Table 2-13. SCT20-IP Menu Parameters © Rice Lake Weighing Systems ● All Rights Reserved...

  • Page 26: Sct20-Ip (Ethernet Tcp/Ip) Settings

    SCT Weight Transmitter – 20 Series Technical Manual SCT20-IP (Ethernet TCP/IP) Settings SEtP1 000000 P-tArE CALIb PArA 0 EtHnEt SErIAL FILtEr Out-In tESt 1 PAddr SUbnEt GAtuAY NodE nOnE bAud Addr HErt2 dELAY PArItY StOP UEb5ru Enter # Enter # 2400 nOnE NOdbUS...
  • Page 27  will be displayed. 2. Press until  is displayed. Press 3. Press until desired parameter is displayed. Press 4. Press until desired value is displayed. Press 5. Press twice to exit set-up menu. © Rice Lake Weighing Systems ● All Rights Reserved...

  • Page 28: Outputs And Inputs Configuration

    SCT Weight Transmitter – 20 Series Technical Manual 2.10 Outputs And Inputs Configuration DeviceNet Options Analog Options Profibus Options Ethernet Options Figure 2-9. Outputs and Inputs Menu Structure Parameter Options Description OUt 1 OPEn Normally Open: the relay is de-energized and the contact is open when the weight is lower than the programmed OUt 2 setpoint value;...

  • Page 29: Test

    Current output test UOLt voltage output test NU-CEL Millivolt Test - displays the load cell response signal in mV with four decimals. * Indicates default value. Table 2-16. Test Parameters © Rice Lake Weighing Systems ● All Rights Reserved...

  • Page 30: Setpoints Programming

    SCT Weight Transmitter – 20 Series Technical Manual 2.12 Setpoints Programming 1. Press to enter setpoints and hysteresis settings. 2. Press until desired setpoint or hysteresis parameter is displayed. Press 3. Press until desired value is displayed. Press 4. Press to exit setpoints and hysteresis settings.

  • Page 31: Reserved For The Installer

    1. With power off, press and hold , then power on.  is displayed. 2. Press is displayed.  3. Press is displayed.  4. Press is displayed. Instrument will reboot.  © Rice Lake Weighing Systems ● All Rights Reserved...

  • Page 32: Program Selection - Not Legal

     Press to quit the program without introducing any 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 Note Support. 2.13.7 Keypad Or Display Locking 1.

  • Page 33: Operation

    By keeping the input closed, the maximum weight value reached remains displayed. Upon opening the input, the current weight is displayed. Note To view a sudden variation peak, set the FILTER ON THE WEIGHT to 0. © Rice Lake Weighing Systems ● All Rights Reserved...

  • Page 34: Alarms

    The load cell is a 4-wire and there are no jumpers between EX- and REF- and between EX+ and REF+.  The weight display exceeds 110% of the full scale. Internal instrument converter failure. Check load cell connections and, if necessary, contact Rice Lake Weighing Systems Technical  Support.

  • Page 35: Sct20-Dn (Devicenet)

    Operation SCT20-DN (DeviceNet) The SCT20-DN works as a source in a DeviceNet network. Load the included eds file (DeviceNet_20.eds) in the DeviceNet primary’s development instrument. The data exchanged by SCT20-DN are: Outgoing Data from SCT20-DN (Read) Addresses Gross Weight [4 bytes]...
  • Page 36 SCT Weight Transmitter – 20 Series Technical Manual Digital Inputs Status Bit No. Description Bit No. Description Bit 0 INPUT 1 status Bit 4 — Bit 1 INPUT 2 status Bit 5 — Bit 2 — Bit 6 — Bit 3 —...

  • Page 37: Profibus

    EEPROM memory, so that they are maintained upon the instrument power on, it is necessary to send the command 99 (Save data in EEPROM) of the Command Register. © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 38 SCT Weight Transmitter – 20 Series Technical Manual Divisions And Units Measure Registry (40014) This register contains the current setting of the divisions (parameter ) and of the units of measure ( parameter). Use this register together with the coefficient registers to calculate the value displayed by the instrument. Least significant byte Most significant byte L Byte (Division)
  • Page 39 Bit 13 (writing error) rises if the PLC tries to write a value out of a parameter’s permitted interval. In this case the writing has no effect and the previous parameter value is maintained. © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 40 SCT Weight Transmitter – 20 Series Technical Manual Possible Command To Send To The Command Register Code Description Code Description No command Reserved NET display Reserved SEMI-AUTOMATIC ZERO Keypad lock Reserved Keypad and display unlock Reserved Keypad and display lock Reserved Save data in EEPROM Reserved...

  • Page 41: Sct20-Ip (Ethernet/Ip™)

    Input Data to SCT20-IP (Write) Addresses Enable Writing [2 bytes]0 0x0000-0x0001 Command Register [2 bytes] 0x0002-0x0003 Command of Digital Outputs [2 bytes] 0x0004-0x0005 Exchange Register [4 bytes] 0x0006-0x0009 Table 3-18. Input Data to SCT20 (EtherNet/IP) © Rice Lake Weighing Systems ● All Rights Reserved...

  • Page 42: Double Port Ethernet/Ip Interface

    SCT Weight Transmitter – 20 Series Technical Manual 3.8.2 Double Port Ethernet/IP Interface The double port interface included the following: • uses a different configuration file • Different structuring of the Ethernet/IP interface in terms of data exchange zones Output Data from SCT20-IP (Read) Addresses Type Gross Weight [4 byte]...
  • Page 43 Bit a 1: output is closed; Bit a 0: output is open. Note Setting bit 15 to 1 on the PLC DeviceNet takes control of all the outputs, even if they are in different modes. © Rice Lake Weighing Systems ● All Rights Reserved...

  • Page 44: Sct20-Tcp/Ip (Ethernet Tcp/Ip)

    SCT Weight Transmitter – 20 Series Technical Manual Status Register Bit No. Description Bit 0 Cell Error Bit 1 A/D Converter Malfunction Bit 2 Maximum weight exceeded by 9 divisions Bit 3 Gross weight higher than 110% of full scale Bit 4 Gross weight beyond 999999 or less than -999999 Bit 5...
  • Page 45 2. Enter the IP Address of SCT20-TCP/IP and press . This activates the socket connection. ACTIVATE 3. Type the ASCII command (without CR) and press . The answer displays in the Received box. SEND © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 46 SCT Weight Transmitter – 20 Series Technical Manual Figure 3-4. TCP/IP Socket Test Screen Figure 3-5. TCP/IP Socket Test Screen (Examples) Use the added COM to communicate with SCT20-TCP/IP using the selected protocol. SCT20 TCP/IP.exe is included on the CD for testing commands and it only works with Port 10001. Note Do not include the <CR>...

  • Page 47: Modbus/Tcp

    The data received and transmitted via MODBUS-RTU protocol have the following characteristics: • 1 start bit • 8 data bits, least significant bit sent first • Instrument settable parity bit • Instrument settable stop bit © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 48 SCT Weight Transmitter – 20 Series Technical Manual Modbus Supported Functions Among the commands available in the MODBUS-RTU protocol, only the commands in Table 3-26 are used to manage communication with the instruments. Other commands may not be interpreted correctly and could generate errors or system shut-downs: Function Description...
  • Page 49 — 40008 GROSS WEIGHT H — 40009 GROSS WEIGHT L — 40010 NET WEIGHT H — 40011 NET WEIGHT L — 40012 PEAK WEIGHT H — Table 3-33. Usable Registers (Modbus-RTU) © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 50 SCT Weight Transmitter – 20 Series Technical Manual REGISTER DESCRIPTION Saving to EEPROM ACCESS 40013 PEAK WEIGHT L — 40014 Divisions and Units of measure ) — 40015 Coefficient H — 40016 Coefficient L — 40017 Setpoint 1 H Only after command ‘9’’ of the COMMAND REGISTER 40018 Setpoint 1 L...
  • Page 51 Use this register together with the registers to calculate the value displayed by the SCT20-MB. Least significant byte Most significant byte L Byte (Division) H Byte (Units of Measure) Table 3-36. Divisions and Units of Measure (Analog Model) © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 52 SCT Weight Transmitter – 20 Series Technical Manual Utilization of the Coefficient value with the different units of Division Units of measure Units of measure measure settings compared to value Divisor Decimals value description the gross weight detected Kilograms Does not intervene Grams Does not intervene Tons...

  • Page 53: Ascii Bidirectional Protocol

    Using the  parameter, it is possible to set a delay time for the instrument before it transmits a response. See Section 2.4 on page The following communication modes available (Section 2.4 on page 16): • : • ?:? © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 54 SCT Weight Transmitter – 20 Series Technical Manual Data Identifiers Data Sent Definition Beginning of a request string (36 ASCII) & o && Beginning of a response string (38 ASCII) 2 characters for instrument address (48 ÷ 57 ASCII) 1 character to indicate the correct reception(33 ASCII 1 character to indicate a reception error (63 ASCII) 1 character to indicate an error in the command execution (23 ASCII) ckck...
  • Page 55 The y field acquires the following values: for division value = 1 for division value = 2 for division value = 5 Table 3-41. Decimal and Division Definitions © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 56 SCT Weight Transmitter – 20 Series Technical Manual Response Value Definition for division value = 10 for division value = 20 for division value = 50 for division value = 100 Table 3-41. Decimal and Division Definitions • Incorrect reception: &&aa?\ckckCR Tare Weight Zero Setting The PC transmit the following ASCII string containing the zeroing command: •...
  • Page 57 The check-sum inserted in the strings transmitted is made up of the 2 characters which represent the result of the XOR operation in hexadecimal notation (in this example the character 7 and the character 5. © Rice Lake Weighing Systems ● All Rights Reserved...

  • Page 58: Fast Continuous Transmission Protocol

    SCT Weight Transmitter – 20 Series Technical Manual 3.13 Fast Continuous Transmission Protocol This protocol allows for continuous serial output at high update frequencies. Up to 300 strings per second are transmitted (with a minimum transmission rate of 38400 baud). The communication modes available are (Section 2.4 on page 16):...
  • Page 59 E CHAR = CR Connector Connector LWPOS = 7 J8 (RS-232) RS-485 RX- LENGTH = 19 RS-485 RX+ Table 3-49. Laser Light Setup Laser Light 1550 S CHAR = SoH LWPOS = 000008 © Rice Lake Weighing Systems ● All Rights Reserved...

  • Page 60: Communication Examples

    SCT Weight Transmitter – 20 Series Technical Manual 3.16 Communication Examples The numerical data below are expressed in hexadecimal notation with prefix h. Example 1: Command for multiple writing of registers (hexadecimal command 16, h10) Assuming that we wish to write the value 0 to the register 40017 and the value 2000 to the register 40018, the string to generate must be: h01 h10 h00 h10 h00 h02 h04 h00 h00 h07 hD0 hF1 h0F The instrument will respond with the string:...
  • Page 61 Datum 4 H Datum 4 L CRC16 H CRC16 L Table 3-52. Communication Example 3 For additional examples regarding the generation of correct control characters (CRC16) refer to the manual Modicon PI- MBUS-300. © Rice Lake Weighing Systems ● All Rights Reserved...

  • Page 62: Specifications

    Max 8 (350 ohm); 5 VDC/ 120 mA in parallel and Supply Linearity/ Analog <0.01% F.S.; <0.01% F.S./ ° Output Linearity Thermal Drift <0.0005% F.S./°C; <0.003% F.S./°C (Analog Only) A/D Converter 24 bit (16.000.000 points) © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 63 SCT Weight Transmitter – 20 Series Technical Manual Max Divisions (with ±999999 Measurement Range ± 10 mV = Sensitivity 2mV/V) Measurement Range ±39 mV Max Sensitivity of ±7 mV/V Usable Load Cells Max Conversions 300/second per second Display Range ±999999 Number of Decimals/ 0-4/ x 1 x 2 x 5 x 10 x 20 x 50 x 100 Display Increments...
  • Page 65 Specifications subject to change without notice. Rice Lake Weighing Systems is an ISO 9001 registered company. 230 W. Coleman St. • Rice Lake, WI 54868 • USA U.S. 800-472-6703 • Canada/Mexico 800-321-6703 • International 715-234-9171 • Europe +31 (0)26 472 1319...

This manual is also suitable for:

Sct20-anSct20-mbSct20-pbSct20-ipSct20-tcp/ip

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