Chapter 9 Communication instructions
204 Rockwell Automation Publication 2080-RM001D-EN-E - February 2015
Com queue: Message requests added to the Com queue have a buffer allocated
and processed by the communication task. The maximum queue size limit is 4.
Wait queue: Messages that cannot be added to the Com queue are added to the
Wait queue to be processed at a later time. The Wait queue does not have a
maximum size limit.
MODBUSTARPARA data type
The following table describes the MODBUSTARPARA data type.
Parameter Data type Description
Addr UDINT Target data address (1 - 65536). Decreases by one when sending.
Node USINT The default slave node address is 1. The range is 1- 247. Zero is the Modbus broadcast address and is only valid for Modbus write
commands (for example, 5, 6, 15 and 16).
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