PROSOFT Modbus communication module of MVI56-MCM ControlLogix platform

System Requirements 

The MVI56-MCM module requires the following minimum hardware and software 

components: 

Rockwell Automation ControlLogix™ processor, with compatible power supply and one free slot in the rack, for the MVI56-MCM module. The module requires 800 mA of available power.  

Rockwell Automation RSLogix 5000 programming software version 2.51 or higher Rockwell Automation RSLinx communication software Pentium® II 450 MHz minimum. Pentium III 733 MHz (orbetter) recommended 

Supported operating systems: 

o Microsoft Windows XP Professional with Service Pack 1 or 2  

o Microsoft Windows 2000 Professional with Service Pack 1, 2, or 3 

o Microsoft Windows Server 2003  128 Mbytes of RAM minimum, 256 Mbytes of RAM recommended  100 Mbytes of free hard disk space (or more based on application requirements)  

256-color VGA graphics adapter, 800 x 600 minimum resolution (True Color 1024 × 768 recommended)  CD-ROM drive ProSoft Configuration Builder, HyperTerminal or other terminal emulator 

Deployment Checklist 

Before you begin configuring the module, consider the following questions. Your 

answers will help you determine the scope of your project and the configuration 

requirements for a successful deployment.  

1 ____________ Are you creating a new application or integrating the module into an existing application? Most applications can use the Sample Ladder Logic without any edits to the Sample Program. 

2 ____________ Which slot number in the chassis will the MVI56-MCM module occupy? For communication to occur you must enter the correct slot number in the sample program.  

3 ____________ Are RSLogix 5000 and RSLinx installed? RSLogix and RSLinx are required to communicate to the ControlLogix processor (1756-L1, L55, L61 & L63). Sample Ladder programs are available for many versions of RSLogix 5000.  

4 ____________ How many words of data do you need to transfer in your application (from ControlLogix to Module / to ControlLogix from Module)? The MVI56-MCM module can transfer a maximum of 5000 (16-bit) registers to/from the ControlLogix processor. The Sample Ladder transfers 600 words to the ControlLogix processor (into the Read Data array) and obtains 600 words from the ControlLogix processor (from the Write Data array). 

5 ____________ Will you be using the module as a Modbus Master or Modbus Slave Will you be transferring data using Modbus RTU or Modbus ASCII? Modbus is a master/slave network. Only one master is allowed on the Com line (max 32 devices/RS485). The Master is responsible for polling data from the slaves on the network. 

6 ____________ For a Modbus Master, what devices (node ID) and Modbus addresses do you need to exchange data with on the Modbus network? As a Modbus master, you must know thenode ID # of the slave devices you wish to obtain data from, as well as the Modbus address (coil 0001, register 4001 and so on) of the data that must be read from or written to that slave device. 

7 ____________ For a Modbus Slave, how many words or bits of data do you need to send to the master device? The MVI56-MCM module can send data to a Modbus master as 0x coil data, 1x input coil data, 3x input registers and 4x holding registers. The sample program transfers 600 (16-bit) words or 9600 bits to the ControlLogix processor, and 600w or 18 bits from theControlLogix processor. 

8 Serial Communication Parameters for the Modbus network:  

____________ Baud rate? 

____________ Data bits? 

____________ Parity? 

____________ Stop bits?

Required for master and slave configurations. 

9 ____________ Wiring type to be used (RS232, 422 or 485). Set by jumper settings (page 16). Required for proper implementation of the module in master and slave configurations. 

Setting Jumpers If you use an interface other than RS-232 (default), you must change the jumper configuration to match the interface. There are three jumpers located at the bottom of the module. The following illustration shows the MVI56-MCM jumper configuration: 1 Set the PRT 2 (for application port 1) and PRT 3 (for application port 2) jumpers for RS232, RS422, or RS485 to match the wiring needed for your application. The default jumper setting for both application ports is RS-232.   2 The Setup Jumper acts as "write protection" for the module’s flash memory. In "write protected" mode, the Setup pins are not connected, and the module’s firmware cannot be overwritten. Do not jumper the Setup pins together unless you are directed to do so by ProSoft Technical Support.  

Installing the Module in the Rack If you have not already installed and configured your ControlLogix processor and power supply, please do so before installing the MVI56-MCM module. Refer to your Rockwell Automation product documentation for installation instructions.

1 Turn power OFF. 2 Align the module with the top and bottom guides, and slide it into the rack until the module is firmly against the backplane connector.   3 With a firm but steady push, snap the module into place.   4 Check that the holding clips on the top and bottom of the module are securely in the locking holes of the rack. 5 Make a note of the slot location. You must identify the slot in which the module is installed in order for the sample program to work correctly. Slot numbers are identified on the green circuit board (backplane) of the ControlLogix rack.   6 Turn power ON.