Rice Lake SCT-20 Technical Manual

Rice Lake SCT-20 Technical Manual

Signal conditioning transmitter/indicator
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SCT-20 Series
Signal Conditioning Transmitter/Indicator
Technical Manual
March 2, 2022
PN 131128 Rev H

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Summary of Contents for Rice Lake SCT-20

  • Page 1 SCT-20 Series Signal Conditioning Transmitter/Indicator Technical Manual March 2, 2022 PN 131128 Rev H...
  • 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 ..............27 Technical training seminars are available through Rice Lake Weighing Systems.
  • Page 4 FCC Compliance..................63 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

    IMPORTANT When the SCT-20 is installed inside of the electrical panel, it is recommended that the units be installed vertically to a horizontal DIN rail. This minimizes heat buildup from multiple units being stacked and also enables optimal ventilation through the unit. If possible, it is recommended that the unit be installed towards the bottom of a panel to avoid the warmest parts of the panel.
  • 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-20 Series Connectivity Analog Output (Current and Voltage) DC Power Other Options Supplier DeviceNet (12-24 Volt) PROFIBUS PROFINET 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...
  • 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-20 Series 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...
  • Page 11: Key Functions

    The LEDs are activated in sequence to indicate that a setting and not a weight is being viewed. Note After pressing the first digit flashes and can be edited. For numeric entries, press to select desired digit, then press to increment the digit. © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 12: Instrument Commissioning

    SCT-20 Series 1.11 Instrument Commissioning 1. Plug power cord into an outlet to power on the indicator. The display shows in sequence: •  followed by the software code () •  followed by the software version () •  followed by the hardware code () •...
  • 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

     (Section 2.10 on page      PROFIBUS settings (Section 2.7 on page   SCT-20 EtherNet/IP settings (Section 2.8 on page      Outputs and Inputs configuration (Section 2.10 on page  ...
  • Page 15 To calibrate the instrument, the theoretical calibration (Section 2.1.2 on page 12) 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). © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 16: Theoretical Calibration

    SCT-20 Series 2.1.2 Theoretical Calibration This function allows load cell rated values to be set. To perform the theoretical calibration set ,  and  in sequence. See Figure 2-2 on page 1. Press and hold , then press .  is displayed.
  • Page 17: Zero Value Manual Entry

    (). © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 18: Setting Units Of Measure

    SCT-20 Series 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 5. Press twice to exit set-up menu.
  • Page 19: Filter On The Weight

    Filter Value Response Time [ms] Display and Serial Port Refresh Frequency [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-20 Series 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 . The currently programmed value is displayed.
  • 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-20 Series 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: Sct-20 Devicenet™ Settings

    Example: for a 4-20 mA output and a minimum analog setting, the PLC or tester reads 4.1 mA. Set the parameter to 3.9 to obtain 4.0 on the PLC or tester. See Analog Output Type Scale Corrections for additional information. Table 2-10. Analog Menu Parameters © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 24: Soldered Jumper

    SCT-20 Series Parameter Options Description Full scale analog output correction: if necessary adjust the analog output, allowing the PLC to indicate the value set in the  parameter. Example: for a 4-20 mA output with the analog set to full scale and the PLC or tester reads 19.9 mA, set the parameter to 20.1 to obtain 20.0 on the PLC or tester.
  • Page 25: Sct-20 Ethernet/Ip™ Settings

     Big Endian Set IP address in the  EtherNet/IP™ network. * Set Subnet mask  * Set the Gateway address  * * Indicates default value. Table 2-13. SCT-20 IP Menu Parameters © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 26: Sct-20 Ethernet Tcp/Ip Settings

    NOdbUS 4800 ASCII 9600 EUEn 19200 HdrI P 38400 HdrI Pn 115200 Figure 2-8. SCT-20 TCP/IP Menu Structure Parameter Options Description Set IP address in the EtherNet/IP™ network. **  * Set Subnet mask. **  * * Set the Gateway address.
  • 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-20 Series 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-20 Series 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: Default Scale

     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 32: Operation

    SCT-20 Series Operation Semi-automatic Tare (Net/Gross) The semi-automatic tare value is lost upon instrument power-off. Note The semi-automatic tare operation is not available if the gross weight is zero. 1. To capture tare and weigh in net mode (Semi-Automatic Tare), close the Net/Gross input or press for three seconds.
  • Page 33: 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 34: Sct-20 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 SCT-20 DeviceNet (Read) Addresses Gross Weight [4 bytes] 0x0000-0x0003...
  • Page 35 Net weight beyond 999999 or less than -999999 Bit 13 — Bit 6 — Bit 14 — Bit 7 Gross weight negative sign Bit 15 Force Output Table 3-9. Status Register (DeviceNet) © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 36: Profibus

    SCT-20 Series PROFIBUS • The SCT20-PB works as a PROFIBUS DP V0 source in a PROFIBUS-DP network. • Load the included .gsd file (Profibus_20.gsd) attached to the instrument in the development system of the PROFIBUS primary. • The available modules are: •...
  • Page 37 Bit 13 — Bit 6 — Bit 14 — Bit 7 — Bit 15 — Table 3-12. Digital Input Status (PROFIBUS) Bit a 1: input high; Bit a 0: input is low © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 38 SCT-20 Series Digital Outputs Command It allows control to the outputs status in See Section 2.10 on page Bit No. Description Bit No. Description Bit 0 OUTPUT 1 status Bit 8 — Bit 1 OUTPUT 2 status Bit 9 —...
  • Page 39 Changing some instrument parameters via keyboard can take the PROFIBUS network out of the data exchange Note status and put the PLC in stop status; when programming the instrument the plant must be in stand-by status © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 40: Sct-20 Ethernet/Ip

    SCT-20 Series SCT-20 EtherNet/IP™ The SCT20-IP works as a device in a EtherNet/IP network. 3.8.1 Instrument Setup 1. Press and hold .  displays. 2. Press until  displays. Press 3. Press to navigate through menu. • : select the reading/writing of the byte in LITTLE-ENDIAN or BIG-ENDIAN mode –...
  • Page 41: Single Port Ethernet/Ip Interface

    Input Data to SCT-20 EtherNet/IP (Write) Addresses Type Command Register [2 byte] 0x0000-0x0001 Integer Digital Outputs Command [2 byte] 0x0002-0x0003 Integer Exchange Register [4 byte] 0x0004-0x0007 Double Integer Table 3-20. Input Data to SCT-20 (EtherNet/IP) © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 42 SCT-20 Series Generic EtherNet/IP Module Setup The configuration used when setting up a device with the generic module file. Figure 3-2. Dual Port – Generic EtherNet/IP Module Setup Output Data from SCT-20 EtherNet/IP (Read) Addresses Type Header Information [4 bytes]...
  • Page 43 Operation Internal Status When the internal status is not 0 there is an internal error, so data from SCT-20 EtherNet/IP are not reliable. When the internal status is 0 data from SCT-20 EtherNet/IP are reliable. Header Information The header information value must be a 1, if it is a 0 then the SCT-20 needs to be replaced.
  • Page 44 SCT-20 Series Digital Outputs Command It allows control to the outputs status in  mode. See Section 2.10 on page 24 Bit No. Description Bit No. Description Bit 0 OUTPUT status Bit 8 — Bit 1 OUTPUT 2 status Bit 9 —...
  • Page 45: Sct-20 Ethernet Tcp/Ip

    Press Enter to confirm. 7. Press 1 Chann to change the serial baud rate of the Ethernet Module to match the baud rate set in SCT-20 TCP/IP Protocol Selection (default 9600). Do not change any other parameters. Press Enter to confirm.
  • Page 46 To connect to the SCT-20 TCP/IP using a socket (for example Winsock), the port to use is 10001. To connect to SCT-20 TCP/IP via Ethernet TCP/IP through a serial virtual port (virtual COM port of a PC) perform the following steps.
  • Page 47: Modbus/Tcp

    2. Enter 1 to manually configure IP Address, Default Gateway Address and Netmask. 3. Enter S to save. Modbus/TCP commands and registers are the same as ModbusRTU protocol. For more information, see Section 3.11 Note on page © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 48: Set Ip Address With Lantronix Software

    SCT-20 Series 3.10.2 Set IP Address with Lantronix Software To configure IP address of SCT-20 TCP/IP, the Lantronix DeviceInstaller must be installed on a Windows PC. 1. Connect the PC and SCT-20 TCP/IP through a LAN, point-to-point or with hub/switch.
  • Page 49: Modbus-Rtu Protocol

    Tot. bytes = 3+2*No. registers+2 in which: No. registers= number of Modbus register to be read, starting from the Address 1° register No. bytes = number of data bytes to follow © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 50 SCT-20 Series Function 16: Preset Multiple Registers (Multiple Register Writing) QUERY Address Function Add. reg. 1 No. reg. No. bytes Val. reg.1 Val. reg.2 2 bytes 0x10 0x0000 0x0002 0x04 0x0000 0x0000 Table 3-31. Multiple Register Writing Query (Modbus-RTU) Tot. bytes = 7+2*No. registers+2...
  • Page 51 40037-40038. To save this value, send the control 101 from the Command Register. If the operation is completed successfully, the two test weight registers are set to zero. © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 52 SCT-20 Series Analog Output Setting (Analog Models Only) Write the weight in the registers 40045 (Weight value corresponding to the Full Scale of analog output H) and 40046 (Weight value corresponding to the Full Scale of analog output L), or write the weight 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).
  • Page 53 Zero-setting for calibration Reserved Test weight storage for calibration Reserved — Reserved — Reserved — Reserved — Reserved — Reserved 9999 Reset (reserved) Table 3-39. Commands to Command Register (Analog Model) © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 54: Ascii Bidirectional Protocol

    SCT-20 Series 3.12 ASCII Bidirectional Protocol All the sample commands use address 1. If a different address is used it will need a different Check-Sum calculated. Note The instrument replies to the requests sent from a PC/PLC. Using the  parameter, it is possible to set a delay time for the instrument before it transmits a response. See Section 2.4...
  • Page 55 Possible instrument responses: • Correct reception: &&aa!\ckckCR • Incorrect reception: &&aa?\ckckCR Switching From Net Weight To Gross Weight The PC transmits: $aaGROSSckckCR$01GROSS5BCR Possible instrument responses: • Correct reception: &&aa!\ckckCR • Incorrect reception: &&aa?\ckckCR © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 56 SCT-20 Series Reading Of Decimals And Number Of Divisions The PC transmits: $aaDckckCR$01D45CR Possible instrument responses: • Correct reception: &aaxy\ckckCR Response Value Definition number of decimals division value The y field acquires the following values: for division value = 1...
  • Page 57 The PC transmits: $aaFREckckCR$01FRE50CR Possible instrument responses: • Correct reception: &&aa!\ckckCR • Incorrect reception: &&aa?\ckckCR Display And Keypad Lock The PC transmits: $aaKDISckckCR$01KDIS14CR Possible instrument responses: • Correct reception: &&aa!\ckckCR • Incorrect reception: &&aa?\ckckCR © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 58: Fast Continuous Transmission Protocol

    SCT-20 Series Check-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-bit ASCII codes of the only part of the underlined string.
  • Page 59: Continuous Transmission Protocol

    In case weight value is under -99999, the minus sign (-) is sent alternated with the most significant figure. In the event of error or alarm, the 6 characters of the gross and net weight are replaced by the messages found in Table 3.5 on page © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 60: Interface To Remote Display

    SCT-20 Series 3.15 Interface to Remote Display Remote Display (Laser Light) 1. Press and hold , then press .  is displayed. 2. Press until  is displayed. 3. Press .  is displayed. 4. Press .  is displayed.
  • Page 61 Assuming that we wish to read the two gross weight values (in the example 4000) and net weight values (in the example 3000), reading from address 40008 to address 40011 must be performed by sending the following string: H01 h03 h00 h07 h00 h04 hF5 hC8 © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 62 SCT-20 Series The instrument will respond with the string: H01 h03 h08 h00 h00 hF hA0 h00 h00 h0B hB8 h12 h73 Query Field Name Response Field Name Instrument Address Instrument Address Function Function Instrument Address Instrument Address Function Function...
  • Page 63 Operation © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 64: Compliance

    SCT-20 Series Compliance DECLARATIONOF CONFORMITY SCT-10, SCT-20, SCT-30, SCT-40 2014/35/EU low voltage EN 61010-1:2010 for 230/115 VAC type 2014/30/EU EMC EN 55011:2016+A1+A11:2020 EN 61000-6-2:2019 EN 61000-6-4:2019 EN 61000-4-2:2009 EN 61000-4-3:2006+A2:2010 EN 61000-4-4:2012 EN 61000-4-5:2014+A1:2017 EN 61000-4-6:2014 2011/65/EU RoHS EN 50581:2012...
  • Page 65 EN 55011:2016+A1+A11:2020 EN 61000-6-2:2019 EN 61000-6-4:2019 EN 61000-4-2:2009 EN 61000-4-3:2006+A2:2010 EN 61000-4-4:2012 EN 61000-4-5:2014+A1:2017 EN 61000-4-6:2014 2012/3032 RoHS EN 50581:2012 Rice Lake, WI USA Brandi Harder February 4, 2022 Quality Manager © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 66: Specifications

    SCT-20 Series Specifications Power DC Max Sensitivity of ±7 mV/V Usable Load Cells Power Supply and 12/24 VDC ± 10%; 5W Consumption (VDC) Max Conversions 300/second Operator Interface per second Display STN backlight transmissive LCD 128 x 64 pixel resolution Display Range ±999999...
  • Page 67: Fcc Compliance

    Le présent appareil numérique n'émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques de la Class A prescites dans le Règlement sur le brouillage radioélectrique edicté par le ministère des Communications du Canada. © Rice Lake Weighing Systems ● All Rights Reserved...
  • Page 68 SCT-20 Series www.RiceLake.com Visit our website...
  • Page 70 © Rice Lake Weighing Systems Specifications subject to change without notice. 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 March 2, 2022 PN 131128 Rev H...

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