beanpole_ecc
Member
In our plant, we have a lot of issues with IO from one machine to another getting corrupted and failing. I put forth the idea to have the permissive signals (downstream running signals) to be communicated over ethernet instead of relying on this constant downtime problem. So they approved a test line to incorporate this idea and see how it operates. Now let me start by saying the safety circuit and associated interlocks are not part of this. it's just the single wire interlocks that over the years were put in place to tell one machine what's running and what's not ahead of it.
I've almost completed my work and was wondering if anyone else has done something like this and what others' thoughts are on this. I'm taking precautions where possible by having timeouts on both ends of each PLC-PLC comm end.
All message blocks are on data change triggers and repeat if no data change timers as triggers to continuously check for connection and turn off machine if loss of connection. All message blocks are write blocks and all receiving PLC's look at an always on bit in the date file, upon seeing it they unlatch that bit and reset a check timer.
Anyway, if you have any other questions on my setup or want to offer insights let me know. Thanks for an awesome forum.
I've almost completed my work and was wondering if anyone else has done something like this and what others' thoughts are on this. I'm taking precautions where possible by having timeouts on both ends of each PLC-PLC comm end.
All message blocks are on data change triggers and repeat if no data change timers as triggers to continuously check for connection and turn off machine if loss of connection. All message blocks are write blocks and all receiving PLC's look at an always on bit in the date file, upon seeing it they unlatch that bit and reset a check timer.
Anyway, if you have any other questions on my setup or want to offer insights let me know. Thanks for an awesome forum.