I'll start off by saying I'm unfamiliar with communications between PLC's, hence my question here.
We have a machine with a ControlLogix & a SLC 5/04 that communicate over DH+. In the program for the ControlLogix PLC i see the MSG instructions for reading from and writing to the SLC 5/04. What has me confused is there are no MSG instruction in the SLC 5/04. So am i right in assuming that this works simply by having the source & destination elements listed in the ControlLogix program for the memory address in the SLC 5/04 and it just simply reads/writes directly to the SLC 5/04's memory and it's program just uses those memory addresses directly instead of having to use MSG instructions to send/receive data from the ControlLogix?
We have a machine with a ControlLogix & a SLC 5/04 that communicate over DH+. In the program for the ControlLogix PLC i see the MSG instructions for reading from and writing to the SLC 5/04. What has me confused is there are no MSG instruction in the SLC 5/04. So am i right in assuming that this works simply by having the source & destination elements listed in the ControlLogix program for the memory address in the SLC 5/04 and it just simply reads/writes directly to the SLC 5/04's memory and it's program just uses those memory addresses directly instead of having to use MSG instructions to send/receive data from the ControlLogix?