Chapter 9 Communication instructions
184 Rockwell Automation Publication 2080-RM001D-EN-E - February 2015
MSG_CIPSYMBOLIC sends a common industrial protocol (CIP) symbolic
message over an Ethernet channel or a serial port.
MSG_CIPSYMBOLIC operation
When the function block is enabled, the receive buffers for the Read operations
are cleared on the rising edge of Enable. See the Message execution processes and
timing diagrams on page 213 for examples.