Function Blocks
MBR Modbus Read Function Block
Revision 11 HC900 Hybrid Control Designer Function Block Reference Guide 193
2/07
MBR Modbus Read Function Block
Description
The MBR label stands for Modbus Read. This block is part of the Communications category. It looks like
this graphically.
Function
A communication function block that expands the read capability of the Modbus Slave function block to 16
additional data points. Multiple blocks may be connected to the same Modbus Slave block.
The Modbus read block has no inputs and 16 outputs. Up to 16 registers can be configured as the source of
data for the outputs.
The configuration data for each point will consist of:
• the address of the source device on the Modbus link,
• the register address of the desired data,
• and the register type: Integer, Float, or Bit Packed.
The sixteen outputs can be connected or tagged in the same manner as any other function block output.
Inputs
ADDR
= Slave address from associated MBS block. (Must be connected to a MBS block)
Outputs
RD1 through RD16
– Last read value from selected address
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