Tuesday, March 28, 2000 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 RSLogix 500 Programming Software for SLC500 Programming Cable for SLC500 West.RSS Driver File Communication Cable between MLC9000 and MCM3150 Card

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

SLC500 Backplane Communications Basics M0M1 Integer File Block Transfer Example

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Completing Communications between MCM and MLC9000 MLC9000 to ProSoft 3150-MCM Cable Pin-out (RS485) 3150-MCMMLC (A) 14 (B) 53 (GND) 7 8

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

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

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

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

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