Function Blocks
MBW Modbus Write Function Block
204 HC900 Hybrid Control Designer Function Block Reference Guide Revision 11
2/07
MBW Modbus Write Function Block
Description
The MBW label stands for Modbus Write. This block is part of the Communications category. It looks
like this graphically.
Function
A communication function block that expands the write capability of the Modbus Slave function block to 8
additional data points. Multiple blocks may be connected to the same Modbus Slave block.
The Modbus write block has 8 inputs and no outputs. The Modbus destination for each of the eight inputs
can be configured. An enable pin lets the data value be written once per scan.
The configuration data for each point will consist of : the address of the destination device on the Modbus
link, the register address of the desired data, and the register type: Integer or Float.
Inputs
EN1 through EN8
= [ON] Data value is written once per scan
WR1 through WR8 = Value to be written to the selected register address.
ADDR = Slave address from associated MBS block. (Must be connected to MBS block)
Outputs
None
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