ProSoft MVI56E-MCMR User Manual page 69

MVI56E-MCMR ♦ ControlLogix Platform
Modbus Communication Module with Reduced Data Block
Preset (Write) Single Register 4x (Modbus Function Code 6)
Used to write to Modbus Holding Registers 4x, this function code will write a
single register to the slave device. The Enable code can be set to a value of 1 for
a continuous write, or a value of 2 to write the data to the slave device only when
the data associated with the Internal Address field has changed.
The following illustration shows a sample command to write Modbus addresses
41041 of Modbus Slave Device Address 1.
Parameter
Enable = 1
Internal Address = 5
Reg Count = 1
Node Address = 1
Modbus Function =2
MB Address in Device =
1040
ProSoft Technology, Inc.
Description
The module will send the command every time it goes through the
command list.
Writes the data from address 5 of the module memory to the slave
device. Based on the B
ACKPLANE
data from MCMR.DATA.W
to the slave device.
Writes 1 register (16-bit) to the slave device.
Issues the Modbus command to Modbus Slave Device Address 1.
Issues Modbus Function Code 6 to write a single register.
Function Code 6, MB Address in Device of 1040 will write to address
41041 of the Modbus slave device.
Configuring the MVI56E-MCMR Module
C , this will take the
ONFIGURATION
D [5] and write that information out
RITE ATA
User Manual
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