Connecting the MLC9000 to the Allen Bradley SLC500 via Modbus
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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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Equipment and Software Needed Modbus

  • 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


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SLC500 Backplane Communications Basics Modbus

  • 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


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SLC500 Backplane Communications Basics Modbus

Integer File

Integer File

M0

M1

...

...

...

...

Block Transfer Example


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Setting Up the ProSoft 3150-MCM Modbus

  • Verify Jumpers are in position for RS485 2-Wire (Factory Default)


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Setting Up Communications between PC and SLC500 Modbus

  • From Start Menu, start RSLinx under Rockwell Software

  • Under Communications, select Configure drivers


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Setting Up Communications between PC and SLC500 Modbus

  • From Available Driver Types select 1747-PIC/AIC+ Driver


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Setting Up Communications between PC and SLC500 Modbus

  • Set station number to 31, pick open comm. port on PC


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Setting Up Communications between PC and SLC500 Modbus

  • Close window then reboot PC to start driver


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Loading the Driver for the 3150-MCM Modbus

From Start Menu, load RSLogix 500


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Loading the Driver for the 3150-MCM Modbus

Select File, then Open and select the directory that West.RSS is stored in.



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Loading the Driver for the 3150-MCM Modbus

  • From Menu Bar on Left, Double-Click on IO Configuration

  • Verify Configuration for correct number of racks and position of modules


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Loading the Driver for the 3150-MCM Modbus

  • From Menu on left, under Data Files, double-click on N255 West

  • Adjust N255:110 to the proper number of loops in the system


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Loading the Driver for the 3150-MCM Modbus

  • N255:111-N255:142 Contain the Modbus Addresses for up to 32 loops

  • Adjust these files to match Modbus Addresses of LCM’s


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Loading the Driver for the 3150-MCM Modbus

  • To begin download, first go to communications menu and select System Comms


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Loading the Driver for the 3150-MCM Modbus

  • Select PLC to download program to

  • Select Download


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Loading the Driver for the 3150-MCM Modbus

  • Select OK to begin download


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Loading the Driver for the 3150-MCM Modbus

Press Yes to Go Online


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Completing Communications between 3150-MCM and MLC9000 Modbus

MLC9000 to ProSoft 3150-MCM Cable Pin-out (RS485)

3150-MCM

MLC 9000

9

5 (A)

1

4 (B)

5

3 (GND)

7

8


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Diagnostics on 3150-MCM Modbus

  • Eight indicator lights on module used as communications diagnostics


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MLC 9000 Parameters Modbus

  • 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


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MLC9000 Parameters Modbus

  • Alarm Words are broken down into sixteen read accessible bits

  • Bits are accessed through address format N250:XXX/XX


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MLC9000 Parameters Modbus

  • 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


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MLC9000 Parameters Modbus

  • Control Bits are broken down into 16 Read/Write bits

  • Parameters are addressed in N254:XXX/XX format


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