5-4 Procedures for Communicating with an Allen-Bradley ControlLogix PLC
5-9
5
Appendix
- EtherNet/IP Compatible Network Unit DL-EP1 User’s Manual (GT2) -
To carry out cyclic communication with multiple PLCs using the
InputOnly connection, the DL-EP1 input data must be sent as a
Multicast packet. With ControlLogix, the DL-EP1 transmission is
fixed to Multicast packet. However, caution is required when using
devices, such as KV or SYSMAC, for which the connection method
can be selected from Multicast or Point to Point.
Changing the message communication settings
After completing "Changing the cyclic communication settings" (Page 5-6), issue
the MSG instruction from the ladder program to execute message communication.)
• Refer to "Logix500 Controllers General Instructions" (1756-RM003) for
details on the MSG instructions.
• Select Inhibit Module when not using cyclic communication.
1
Define the following tags under the RsLogix5000 "Controller Tags" field.
• Tag for storing control information for MSG instruction (message- Message
type)
• Tag for storing data exchanged with MSG instruction (tx_param, rx_param -
INT type)
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