monitoring bits on other PLCs

[drummin89]

I haven't had any experience setting up communication between two PLCs in the past so this is new to me.

I have 2 PLCs in 2 seperate pieces of equipment, 1 down stream from the other. The first PLC is a Controllogix, the second PLC (the down stream one) is a Micrologix 1100. I need the Controllogix to sound an alarm when the Micrologix goes into alarm to alert operators that the down stream equipment is not running.

All PLCs in my plant are networked together through ethernet.

I'm just not sure how to set this up.

 

[Timbert]

I think there is a bunch of ways of doing this. MSG instruction is probably the best way. I just came across Knowledgebase article 38513 which describes setting up a heartbeat between a CompactLogix and an 1100 to tell when communications is lost. That may not be what you want but it will point you in the correct direction.

 

[drummin89]

Thanks, with the help of a coworker and this http://www.rockwellautomation.com.a...between_micrologix_and_controllogix_processor
we figured it out.