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Connecting the MLC9000 to the Allen Bradley SLC500 via Modbus

Connecting the MLC9000 to the Allen Bradley SLC500 via Modbus. Equipment and Software Needed. MLC 9000 BCM with Modbus and appropriate number LCM’s AB SLC 5/03 CPU or higher, Power Supply and Rack 5/03 is smallest CPU to support M0/M1 file transfer ProSoft MCM3150 Modbus Communications Card

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Connecting the MLC9000 to the Allen Bradley SLC500 via Modbus

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  1. Connecting the MLC9000 to the Allen Bradley SLC500 via Modbus

  2. Equipment and Software Needed • MLC 9000 BCM with Modbus and appropriate number LCM’s • AB SLC 5/03 CPU or higher, Power Supply and Rack • 5/03 is smallest CPU to support M0/M1 file transfer • ProSoft MCM3150 Modbus Communications Card • RSLogix 500 Programming Software for SLC500 • Programming Cable for SLC500 • West.RSS Driver File • Communication Cable between MLC9000 and MCM3150 Card

  3. SLC500 Backplane Communications Basics • SLC 500 is a modular PLC • Racks can be configured with a wide variety of modules • PLC CPU receives information from modules in rack via one of two ways • I/O Transfer • Used with Analog or Digital I/O Modules where small amounts of information are being passed • Block Transfer via M0/M1 Files • Used for large blocks of data • M0/M1 files are local to the module • Information must be transferred form M0/M1 files into usable registers • Process is known as Block Transfer

  4. SLC500 Backplane Communications Basics Integer File Integer File M0 M1 ... ... ... ... Block Transfer Example

  5. Setting Up the ProSoft 3150-MCM • Verify Jumpers are in position for RS485 2-Wire (Factory Default)

  6. Setting Up Communications between PC and SLC500 • From Start Menu, start RSLinx under Rockwell Software • Under Communications, select Configure drivers

  7. Setting Up Communications between PC and SLC500 • From Available Driver Types select 1747-PIC/AIC+ Driver

  8. Setting Up Communications between PC and SLC500 • Set station number to 31, pick open comm. port on PC

  9. Setting Up Communications between PC and SLC500 • Close window then reboot PC to start driver

  10. Loading the Driver for the 3150-MCM From Start Menu, load RSLogix 500

  11. Loading the Driver for the 3150-MCM Select File, then Open and select the directory that West.RSS is stored in.

  12. Loading the Driver for the 3150-MCM

  13. Loading the Driver for the 3150-MCM • From Menu Bar on Left, Double-Click on IO Configuration • Verify Configuration for correct number of racks and position of modules

  14. Loading the Driver for the 3150-MCM • From Menu on left, under Data Files, double-click on N255 West • Adjust N255:110 to the proper number of loops in the system

  15. Loading the Driver for the 3150-MCM • N255:111-N255:142 Contain the Modbus Addresses for up to 32 loops • Adjust these files to match Modbus Addresses of LCM’s

  16. Loading the Driver for the 3150-MCM • To begin download, first go to communications menu and select System Comms

  17. Loading the Driver for the 3150-MCM • Select PLC to download program to • Select Download

  18. Loading the Driver for the 3150-MCM • Select OK to begin download

  19. Loading the Driver for the 3150-MCM Press Yes to Go Online

  20. Completing Communications between 3150-MCM and MLC9000 MLC9000 to ProSoft 3150-MCM Cable Pin-out (RS485) 3150-MCM MLC 9000 9 5 (A) 1 4 (B) 5 3 (GND) 7 8

  21. Diagnostics on 3150-MCM • Eight indicator lights on module used as communications diagnostics

  22. MLC 9000 Parameters • N250 File used to hold parameters read from MLC 9000 loops 1-16 • N250:XXX-address of parameter to be accessed • Read-Only data, to be used by PLC or HMI for reference • File N251 used for loops 17-32

  23. MLC9000 Parameters • Alarm Words are broken down into sixteen read accessible bits • Bits are accessed through address format N250:XXX/XX

  24. MLC9000 Parameters • N254 File used for data to be written to MLC9000 • N254:XXX-address format used for accessing write data • Data has Read/Write capabilities, can be manipulated by PLC or HMI

  25. MLC9000 Parameters • Control Bits are broken down into 16 Read/Write bits • Parameters are addressed in N254:XXX/XX format

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