Rice Lake 20 series Technical Manual
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Rice Lake 20 series Technical Manual

Sct weight transmitter
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NicolScales.com
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Nicol Scales & Measurement is an ISO Accredited Calibration
Company that has provided calibration, repair and sales of all types
of weighing and measurement products since 1931.

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  • Page 1 Presented By Dallas Ft Worth Austin Houston NicolScales.com 800.225.8181 Contact Us Nicol Scales & Measurement is an ISO Accredited Calibration Company that has provided calibration, repair and sales of all types of weighing and measurement products since 1931.
  • Page 2 SCT Weight Transmitter 20 Series Technical Manual PN 131128 Rev D...

  • Page 4: Table Of Contents

    Course descriptions and dates can be viewed at www.ricelake.com/training or obtained by calling 715-234-9171 and asking for the training department. © Rice Lake Weighing Systems. All rights reserved. Printed in the United States of America. Specifications subject to change without notice.
  • Page 5 3.16 Communication Examples ............62 4.0 Specifications ..........................65 Rice Lake continually offers web-based video training on a growing selection of product-related topics at no cost. Visit www.ricelake.com/webinars...

  • Page 6: Introduction

    Introduction Manuals can be viewed and downloaded from the Rice Lake Weighing Systems website at www.ricelake.com Warranty information can be found on the website at www.ricelake.com/warranties Safety Safety Symbol Definitions: Indicates a potentially hazardous situation that, if not avoided, could result in death or serious injury, and WARNING includes hazards that are exposed when guards are removed.

  • Page 7: Weighing Instrument Installation

    1.1.1 Weighing Instrument Installation The terminals to be connected to ground, as indicated on the SCT Weight Transmitter wiring guide, must have the same potential as the scale structure ground. If unable to ensure this condition, connect a ground wire between the SCT Weight Transmitter and the scale structure.

  • Page 8: Load Cells

    Weighed Structure Grounding Using a 10 gauge solid or braided wire or braided grounding strap, connect the load cell upper support plate with the lower support plate, then connect all the lower plates to a single earth ground. Once installed, accumulated electrostatic charges are discharged to the ground without going through or damaging the load cells.

  • Page 9: Connectivity

    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 Important for assistance.

  • Page 10: Electrical Connections

    Electrical Connections Basic Information • It is recommended that the negative side of the power supply be grounded. • It is possible to power up to eight 350 ohm load cells or sixteen 700 ohm load cells. • For 4-wire load cells, make a jumper between EX- and REF- and between EX+ and REF+. •...

  • Page 11: Led And Key Functions

    LED and Key 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 Unit of measure: g LED lit: input 2 closed...
  • Page 12 Function Modbus/TCP Status Blinks quickly: Modbus/TCP OK RJ45 Connector Off: no link Left side [Link LED] Amber: 10 Mbps Green: 100 Mbps RJ45 Connector Off: no activity Right side [Activity LED] Amber: half duplex Green: full duplex Table 1-5. Modbus Model LED Funciton Key Functions Figure 1-5.

  • Page 13: Instrument Commissioning

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

  • Page 14: Configuration

    Configuration Scale Menu DeviceNet See Figure 2-5 Models See Figure 2-2 See Figure 2-3 on page21. on page10. on page18. Analog Models Enter # Ethernet Profibus Models Models See Figure 2-9 on page27. Enter # Enter # Figure 2-1. Scale Menu Structure Parameter Options Description...

  • Page 15: Calibration

    Parameter Options Description   Analog options for outputs and inputs configuration  (Section 2.10 on page 27)       PROFIBUS settings (Section 2.7 on page 23)   SCT20-IP (EtherNet/IP) settings (Section 2.8 on page 24) ...
  • Page 16 Parameter Options Description  Enter # System Full Scale is 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 4 = 4000 ...

  • Page 17: Theoretical Calibration

    Parameter Options Description  Enter # Weight (Span) Calibration - after the theoretical calibration is complete and zero is set, the  calibration can be adjusted with actual test weights by changing the displayed value in this parameter.  If changes are made to the theoretical Full Scale ( ), the Sensitivity ...

  • Page 18: Maximum Capacity (Nass )

    2.1.2 Maximum Capacity (NASS ) Maximum capacity is the highest weight of live load/product that can be displayed. When the weight exceeds this ------ value by 9 divisions, the following is displayed: . To disable this function, set to 0. .

  • Page 19: Weight (Span) Calibration (With Test Weights)

    2.1.5 Weight (Span) Calibration (With Test Weights) After performing the theoretical calibration (Section 2.1.1 on page 12) and the Zero setting (Section 2.1.3 on page 13), this function allows calibration to be done using test weights of known value. If adjustment is required, change the displayed value to display the test weight value.

  • Page 20: Display Coefficient

    Unit Display Description  Kilograms  Grams  Tons*  Pounds  Newtons*  Liters*  Bars*  Atmospheres*  Pieces*  Newton meters*  Kilogram meters*  Other generic units of measure not included on the list* * Indicates it is possible to set the display coefficient. To use  it is necessary to enable it, closing the ...

  • Page 21: Filter On The Weight

    Theoretical Calibration For Other Units Of Measure Set in the parameter the value divided by the conversion coefficient from kg to the new unit of measure. Example: The 4 load cells of 1000 kg are placed under a scale for olive oil, which has a specific gravity of 0.916 kg / l. Setting ...

  • Page 22: Zero Parameters

    Display and Serial Port Response Time 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 Zero Parameters .  is displayed. 1. Press and hold , then press until ...

  • Page 23: Serial Communication Settings

    Serial Communication Settings Enter # Enter # Figure 2-3. Serial Communications Menu Structure Parameter Options Description   Disables any type of communication. (Communicati  MODBUS-RTU protocol; possible addresses: from 1 to 99 (Section 3.11 on page 46) on Port) ...
  • Page 24 Parameter Options Description  Maximum Transmission Frequency To be set when the  transmission protocol is selected.     Max setting with min 2400 baud rate   Max setting with min 4800 baud rate    ...

  • Page 25: Rs-485 Serial Communication

    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 + 5 2 3 PC RS232 Figure 2-4.

  • Page 26: Sct20-Dn (Devicenet™) Settings

    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 -...

  • Page 27: Soldered Jumper

    Parameter Options Description  Select the analog output type. 4-20 mA 0-20 mA 0-10 V 0-5 V See Section 2.6.1 for more information. -10 +10 V See Section 2.6.1 for more information. -5 +5 V  Enter # Select the mode to be tracked, gross or net. If the net function is not active, the analog output varies ...

  • Page 28: Analog Output Type Scale Corrections

    2.6.2 Analog Output Type Scale Corrections Minimum and maximum values which can be set for the zero and full scale corrections Refer to  and . Analog Output Type Minimum Maximum 0–10 V -0.15 10.2 0–5 V -0.15 -10 +10 V -10.3 10.2 -5 +5 V...

  • Page 29: Sct20-Ip (Ethernet/Ip™) Settings

    SCT20-IP (EtherNet/IP™) Settings .  is displayed. 1. Press and hold until  is displayed. Press 2. 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. SEtP1 000000 P-tArE...

  • Page 30: Sct20-Ip (Ethernet Tcp/Ip) Settings

    SCT20-IP (Ethernet TCP/IP) Settings SEtP1 P-tArE 000000 CALIb FILtEr PArA 0 EtHnEt SErIAL Out-In tESt 1 PAddr SUbnEt GAtuAY NodE nOnE bAud Addr HErt2 dELAY PArItY StOP UEb5ru Enter # Enter # 2400 nOnE NOdbUS 4800 ASCII 9600 EUEn 19200 HdrI P 38400 HdrI Pn...
  • Page 31 Parameter Options Description   Transmission speed.   The baud rate must be the same as the baud rate setting in the Serial Communications Settings. See Section 2.4 on page 18.       Instruments address ...

  • Page 32: Outputs And Inputs Configuration

    2.10 Outputs And Inputs Configuration DeviceNet Options Analog Options Profibus Options Ethernet Options Figure 2-9. Outputs and Inputs Menu Structure Configuration...
  • Page 33 Parameter Options Description   Normally Open: the relay is de-energized and the contact is open when the weight is lower than  the programmed setpoint value; it closes when the weight is higher than or equal to the programmed setpoint value. ...

  • Page 34: Test

    2.11 Test . is displayed. 1. Press and hold until  is displayed. Press 2. Press 3. Press until desired parameter is displayed. Press 4. For  and , current reading is displayed. Press 5. For , press until the corresponding out value change is flashing. 6.

  • Page 35: Reserved For The Installer

    2.13 Reserved For The Installer 2.13.1 Menu Locking This procedure, makes it possible to block the access to any menu on the instrument. .  is displayed. 1. Press and hold then press 2. Press until menu to be locked is displayed. simultaneously for 3 seconds, the display shows .The decimal point 3.

  • Page 36: 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 Support. 2.13.7 Keypad Or Display Locking 1.

  • Page 37: Operation

    Operation Semi-automatic Tare (Net/Gross) The semi-automatic tare value is lost upon instrument power-off. 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 three seconds.

  • Page 38: Alarms

    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.  The weight exceeds the maximum weight by 9 divisions.

  • Page 39: Sct20-Dn (Devicenet)

    In Analog Models, if an alarm becomes active the relays open and the analog outputs go to the lowest possible value according to the following table: 0/20mA 4/20 mA 0/5 V 0/10 V -10/10 V -5/5 V Range -0.2 mA 3.5 mA -0.5 V -0.5 V...
  • Page 40 Setpoints: The Setpoints are weight values expressed as positive integer numbers, including decimal figures but without decimal point. • READING: send to the Command Register the reading command of the required setpoint (e.g. 90 for reading setpoint 1) and read the content of the Setpoint register. •...

  • Page 41: Profibus

    Status Register Bit No. Description Bit No. Description Cell Error Net weight negative sign Bit 0 Bit 8 A/D Converter Malfunction Peak weight negative sign Bit 1 Bit 9 Maximum weight exceeded by 9 divisions Net display mode Bit 2 Bit 10 Gross weight higher than 110% of full scale Weight stability...
  • Page 42 GROSS WEIGHT – NET WEIGHT – PEAK The weight values are expressed as positive integer numbers, include decimal figures but without decimal point. Read the Status Register to obtain information about sign and possible errors on the weight. To find out the decimal figures use the division module value; Example: the net weight is 100000 and the division is 0.001 (three decimals), the real weight value is 100.000kg.
  • Page 43 Coefficient Display The PROFIBUS register contains the value of parameter , expressed as integer number, with 4 decimal figures but without decimal point. E.g.: If  is 1.2000, the PROFIBUS register contains 12000 Digital Inputs Status Bit No. Description Bit No. Description INPUT 1 status —...
  • Page 44 Status Register Bit No. Description Cell Error Bit 0 A/D Converter Malfunction Bit 1 Maximum weight exceeded by 9 divisions Bit 2 Gross weight higher than 110% of full scale Bit 3 Gross weight beyond 999999 or less than -999999 Bit 4 Net weight beyond 999999 or less than -999999 Bit 5...

  • Page 45: Sct20-Ip (Ethernet/Ip™)

    Real Calibration Commands (With Sample Weight) calibration can be changed via PROFIBUS. SCT20-PB To correctly set the sample weight, the value of the division module must be taken into consideration. Example: to set the value to 100kg and the division value is 0.001, set the register value to 100000 (remove the decimal points from the value that would be 100.000 with decimals).
  • Page 46 The data exchanged by SCT20-IP are: Outgoing Data from SCT20-IP (Read) Addresses Internal Status [2 bytes] 0x0000-0x0001 Gross Weight [4 bytes] 0x0002-0x0005 Net Weight [4bytes] 0x0006-0x0009 Setpoint [4 bytes] 0x000A-0x000D Status Register [2 bytes] 0x000E-0x000F Digital Inputs Status [2 byte] 0x0010-0x0011 Digital Outputs Status [2 byte] 0x0012-0x0013...
  • Page 47 Setpoints: The setpoints are weight values expressed as positive integer numbers; they include decimal figures without a decimal point. • Reading: send to the Command Register the reading command of the required setpoint and read the content of the Setpoint Register. Example: 90 for reading setpoint 1.
  • Page 48 Status Register Bit No. Description Cell Error Bit 0 A/D Converter Malfunction Bit 1 Maximum weight exceeded by 9 divisions Bit 2 Gross weight higher than 110% of full scale Bit 3 Gross weight beyond 999999 or less than -999999 Bit 4 Net weight beyond 999999 or less than -999999 Bit 5...

  • Page 49: Sct20-Tcp/Ip (Ethernet Tcp/Ip)

    SCT20-TCP/IP (Ethernet TCP/IP) To configure Ethernet TCP/IP port of SCT40-TCP/IP, the Lantronix DeviceInstaller must be installed on a Windows PC. 1. Connect the PC and SCT20-TCP/IP through a LAN, point-to-point or with hub/switch. 2. Run the Lantronix Device Installer file (DevInst.exe) on the CD. 3.
  • Page 50 To connect to the SCT20-TCP/IP using a socket (for example Winsock), the port to use is 10001. To connect to SCT20-TCP/IP via Ethernet TCP/IP through a serial virtual port (virtual COM port of a PC) perform the following steps. 1. Run TCPIP.exe found on the CD 2.

  • Page 51: Modbus/Tcp

    3.10 Modbus/TCP works as a source in a Modbus/TCP network. The instrument is configured with DHCP as the SCT20-MB default. the IP Address can be automatically assigned by DHCP, or manually via Telnet. To manually set the IP address via PC, type "telnet <ipaddress> 9999" and press to confirm.
  • Page 52 Modbus Supported Functions Among the commands available in the MODBUS-RTU protocol, only the commands in Table 3-23 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 03 (0x03) Read Holding Register (Programmable Register Reading)
  • Page 53 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 3-26. Multiple Register Writing Query (Modbus-RTU) Tot. bytes = 7+2*No. registers+2 RESPONSE Address Function...
  • Page 54 List Of Usable Registers The MODBUS-RTU protocol implemented on this instrument can manage a maximum of 32 registers read and written in a single query or response. = the register can be read only = the register can be written only R/W = the register can be both read and written = high half of the DOUBLE WORD forming the number = low half of the DOUBLE WORD forming the number...
  • Page 55 REGISTER DESCRIPTION Saving to EEPROM ACCESS 40043 Weight value corresponding to Ony after command ‘99’ of the ZERO of the analog output H Command Register. (Analog Models Only) 40044 Weight value corresponding to ZERO of the analog output L 40045 Weight value corresponding to Full Scale of the analog output H 40046...
  • Page 56 INPUTS REGISTER (40029) OUTPUTS REGISTER (40030) (Read Only) (Read and Write) Bit 0 INPUT 1 Status Bit 0 OUTPUT 1 Status Bit 1 INPUT 2 Status Bit 1 OUTPUT 2 Status Bit 2 — Bit 2 OUTPUT 3 Status Bit 3 —...
  • Page 57 Divisions And Units Measure Registry (40014) This register contains the current settings of the divisions parameter () and the units of measure parameter (). 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)
  • Page 58 Possible Commands To Send To The Command Register (40006) Code Descriptions Code Description No command Reserved — Reserved — — — — — Keypad lock — Keypad and display unlock — Keypad and display lock NET display SEMI-AUTOMATIC ZERO Save data in EEPROM GROSS display Zero-setting for calibration Reserved...

  • Page 59: Ascii Bidirectional Protocol

    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. 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 on page 18.
  • Page 60 Reading Weight, The Setpoint And The Peak (If Present) From The Pc: The PC transmits: $aajckckCR Data Definitions a to read setpoint 1$01a60CR b to read setpoint 2$01b63CR c to read setpoint 3$01c62CR t to read gross weight$01t75CR n to read net weight$01n6FCR p to read the gross weight peak if the ASCII parameter is set as NOdU60;...
  • Page 61 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 for division value = 2 for division value = 5 for division value = 10 for division value = 20...
  • Page 62 Weight (Span) Calibration (With Test Weights) After having performed the Tare Weight Zero Setting, this function allows correct calibration to be done using test weights of known value and, if necessary, any deviations of the indicated value from the known value will be corrected.
  • Page 63 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. The procedure to calculate the check-sum is the following: •...

  • Page 64: Fast Continuous Transmission Protocol

    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 18): : communication compatible with TX RS-485 instruments....

  • Page 65: Continuous Transmission Protocol

    3.14 Continuous Transmission Protocol Using this protocol, the 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 18): : remote display shows the net or gross weight, depending on the remote display setting. •...

  • Page 66: Interface To Remote Display

    3.15 Interface to Remote Display Remote Display (Laser Light) .  is displayed. 1. Press and hold , then press until  is displayed. 2. Press .  is displayed. 3. Press .  is displayed. 4. Press until  is displayed. Press 5.

  • Page 67: Communication Examples

    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 68 Example 2: Command for multiple writing of registers (hexadecimal command 16, h10). Assuming that we wish to write the two setpoint values on the instrument, at 2000 and 3000 respectively, the string must be sent: h01 h10 h00 h10 h00 h04 h08 h00 h00 h07 hD0 h00 h00 h0B hB8 hB0 hA2 The instrument will respond with the string: h01 h10 h00 h10 h00 h04 hC0 h0F...
  • Page 69 Example 3: Multiple command reading for registers (hexadecimal command 3, h03). 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 The instrument will respond with the string: H01 h03 h08 h00 h00 hF hA0 h00 h00 h0B hB8 h12 h73...

  • Page 70: Specifications

    Specifications Power DC Max Divisions (with ±999999 Measurement Range Power Supply and 12/24 VDC ± 10%; 5W ± 10 mV = Sensitivity Consumption (VDC) 2mV/V) Operator Interface Display STN backlit transmissive LCD Measurement Range ±39 mV 128 x 64 pixel resolution 2.36 x 1.26 in (60 x 32 mm) viewing Max Sensitivity of ±7 mV/V...
  • Page 71 SCT Weight Transmitter Technical Manual...
  • Page 73 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 www.ricelake.com www.ricelake.mx www.ricelake.eu www.ricelake.co.in...

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