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If you lose power on a M340 extended rack, do you lose communication to racks down the line?

Published date: 30 January 2019

Issue
M340 extended rack communication with loss of power

Product Line
Modicon M340

Cause 
Loss of power

Resolution
If you lose power on an extended rack in a M340 system the remaining racks will communicate to the main head rack as long as the physical link is not broken.

Example:
If there are four extended racks in an M340 system and the second rack loses power, racks three and four will still be communicating to the main head rack.

 

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