AC 800M Controller Firmware, all versions <3.2/7 - ABB Drives Lost Communication
- The problem is corrected in Control<sup>IT</sup> for AC 800M/C version 3.2/7.
Increasing the modulebus Scan Cycle Time setting has in some cases been seen to avoid the problem.
[ref 3BSE029566D0014 VASMASOITA0851 ]
- AC 800M Controller Firmware, all versions <3.2/7 - ABB Drives Lost Communication
The modulebus communication between PM8xx and ABB Drives (both Standard and Engineered) sometimes stops for a short while (less than one second); the communication resumes automatically.
The problem only happens when using some, typically older, types of communication boards in the Drive.
The communication drop is very short.
Control Builder M will afterwards mark the Drive with a yellow warning icon and the unit status will be "Module missing".