Hello All! I have a question about communicating alarms from a plc/controller to another plc/controller. Generally I am looking for the best practices or industry standard approach. For instance, I need a controller/plc (called "PLC1") to gather alarm information from another controller/plc (called "PLC2")that does all the actual alarm detection. I could have PLC1 poll PLC2 for the data or I could have PLC2 push data to PLC1 only when an alarm or event that I care about happens. An upside to the first method would be that changes to programming will only need to be done at PLC1. But a downside is that the constant polling will unnecessarily use some bandwidth and processor time (which may or may not be a problem). The second method will surely save on bandwidth & processor time but will require programming at both PLC1 & PLC2. Do you have any thoughts on what a best practice or industry standard approach to this would be? Thanks for your time : )