Communicate two Compactlogix without adding PLC in Program

       If you need to data send or receive between two compactlogix using Message(MSG) instruction. Without adding PLC in program (Studio 5000, Rslogix 5000). Communication path is important for Message instruction.

Data Read from L18 Controller

        Configure the MSG instruction Message Type, No of Elements and Destination Element in Configure tab.

Configuration Tab

Communication Tab

       Message Read from the 1769-L32E at IP address 192.168.100.1 would have a Connection path that looks like Project,2,192.168.100.1 (Controller Name, Communication Type, Target Controller IP)

Port #	Communication Type
1	Backplane
2	DH485 -out channel A DHRIO -out channel A ENET -out onto Ethernet ENBT -out onto Ethernet CNB(R),CN2 -out onto ControlNet Controllers -out the serial port
3	DH485 -out channel B DHRIO -out channel B

 

Network Type	Address Format and Value
Backplane	Backplane slot number (0-16 depending on Chassis size)
Ethernet	Ethernet IP address (a.b.c.d)
ControlNet	ControlNet node address (0-99)
DeviceNet	DeviceNet node address (0-63)
DH+	Decimal equivalent of Octal DH+ node address (0-63 or 8#00 -8#77)
RS232 Serial	DF1 node address (0-255, 1 for point to point)

  

CompactLogix (1769-L32E, L35E, 1768-L43(S), L45(S))

CompactLogix needs a 1 for the virtual backplane and always a 0 for controller slot 0 for the path, after the IP. For example, ENBT, 2, 10.10.10.2, 1, 0 

CompactLogix (1769-L16x, L18x, L24x, L27x, L30x, L33x, L36x)

ENBT, 2, 10.10.10.2 (do not use 1 for backplane, and slot number)