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Chapter 6 COMMREQ/Data_Init_Comm
Programming
This chapter explains how to use Communication Requests (COMMREQs) to perform specific tasks with Genius
devices that are attached to a Gateway's Genius bus.
COMMREQs are instructions in the RX3i ladder logic (see example in Figure 30). When a COMMREQ is executed
in ladder logic, communications traffic is directed to the indicated PROFINET Controller module
(IC695PNC001). The PROFINET Controller then communicates with the Genius Gateway over PROFINET. The
Genius Gateway subsequently sends the corresponding background datagram to the Genius block Serial Bus
Address (SBA) specified in the COMMREQ. Status, and optionally some data, is returned from the Genius Block
via the Genius Gateway to the PROFINET Controller and then to the reference memory in the CPU module.
Data_Init_Comm is a ladder logic instruction that can be used to help set up a COMMREQ. It is a more user-
friendly instruction from the programmer's perspective. It performs the same functions as are described in this
Chapter. An example is shown at Figure 31.
For additional information about Genius datagrams, refer to the Genius I/O System and Communications
Manual, GEK-90486–1, which describes Genius Datagrams in detail.
GFK-2892F
March 2019
49
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