PM864 and PM864A compatibility
Our client have bought a replacement for a faulty PM864A controller working in a redundant pair. It has a label PM864 (without A) on the face and PM864AK01 (with A) on the tag (see photos attached).
We have updated the firmaware using the serial firmware update tool on the replacement controller to the version of the existing controller. In a single configuration the replacement controller starts normally, but in a redundant configuration with BC810 interconnection units the controller goes to fault (the fault LED blinking rapidly).
1. What is the real type of the replacement controller, PM864 or PM864A?
2. What's the difference between PM864 and PM864A?
3. Will PM864 and PM864A work together in a redundant configuration with or without BC810 interconnection units?
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