Scenario: client has a non-redundant L81E controller with one Ethernet connected remote chassis. Several spare slots are available. By contract, they were also supplied a spare L81E that sits on the shelf in case the production module dies. We are responsible for maintaining a current program in that spare, and that situation arose this week when I was on-site making edits on the production controller.
I had no spare chassis with me. I was about to plug the spare into an open slot in the remote chassis so I could download the revised program via USB, but I stopped myself over concern that the production program might fault due to a second nearly identical program causing conflict over ownership of output modules, even if left in Program mode.
What to do? Are my concerns unfounded? Suggestions on how to take care of this? I have remote access to the system so I don't necessarily need to make another road trip for this.
I had no spare chassis with me. I was about to plug the spare into an open slot in the remote chassis so I could download the revised program via USB, but I stopped myself over concern that the production program might fault due to a second nearly identical program causing conflict over ownership of output modules, even if left in Program mode.
What to do? Are my concerns unfounded? Suggestions on how to take care of this? I have remote access to the system so I don't necessarily need to make another road trip for this.