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ControlLogix
Installation manual
MVI56-MCM
Prosoft Tehcnology
Page 5 of 11
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1.2
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 Add-On Instruction or Sample Ladder Logic
without any edits to the Sample Program.
2 Which slot number in the chassis will the MVI56E-MCMXT & MVI56E-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 MVI56E-MCMXT & MN/I56E-MCM module can transfer a maximum of 5000 (16-bit)
registers to and 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?
For a Modbus Master, you must know the node ID # of each Slave device to poll. You
also need the Modbus address (for example, coil 0001, register 4001) of the data to
read from or write to each Slave device.
7 For a Modbus Slave, how many words or bits of data do you need to send to the
Master device?
The MVI56E-MCMXT & MN/I56E-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 the ControlLogix processor.
