PCD3.F27x and PCD2.F27xx M-Bus is not always short cut protected!

FAQ #101870

Those M-Bus cards have a short-cut protection on the bus but when the CPU isn't anymore power supplied and the F27x(x) card still has 24 V supply there is no short cut protection anymore!

 

Reason:

The 36 Volts from the M-Bus will destroy some components on the concerned serial port of the card!


Solution:

Use the same power supply for the CPU as for the PCDx.F27x(x) card or if for some reason a different power supply has to be used be aware that in case the CPU isn't power supplied that the M-Bus is NOT short-circuited!

 

Categories

PCD3 / Fxxx

Last update: 28.05.2015 13:39

First release: 22.10.2013 17:28

Views: 1262

The requested software / document is no longer marketed by Saia-Burgess Controls AG and without technical support. It is an older software version which can be operated only on certain now no longer commercially available products.

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