User`s guide

Function Blocks
Function Block Categories and Types
Release E UMC800 Control Builder User’s Guide 81
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Communications category
Table 26 lists the Function block types in the Communications category.
Table 26 Communications category
Block Type Description Graphic Form
MBR Modbus Read - Provides the Modbus interface to the
controller. 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.
MBS
Modbus Slave - A communication function block that is
internally assigned to optional Communication Port B that
allows the controller to communicate with slave devices using
the Modbus protocol. Requires one block per slave device,
up to 16 devices maximum. Supports 4 read and 4 write
parameters plus provides digital indication of communication
integrity. Only one block may be assigned to each slave
device.