ProSoft Technology MVI56E-MCMR - Manual (Page 14)

Start Here MVI56E-MCMR ♦ ControlLogix Platform
User Manual Modbus Communication Module with Reduced Data Block
Page 14 of 225 ProSoft Technology, Inc.
May 13, 2014
1.3 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-MCMR
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 different 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-MCMR 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 serial
communications line (max 32 devices/RS485). The Master is responsible for
polling data from the Slaves on the network.
6 ____________ For a Modbus Master, what Slave Device Addresses and
Modbus Data Addresses do you need to exchange data with on the Modbus
network?
For a Modbus Master, you must know the Slave Device Address number of
each Slave device to poll. You also need the Modbus address (for example,
coil 00001, register 40001) 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-MCMR 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 600 (16-bit) words or 9600 bits from the ControlLogix
processor.
8 Serial Communication Parameters for the Modbus network:
____________ Baud rate?