February 2012 29 – 555
Grounding screw
on front panel
The terminal X131 of the Siemens E/R module of boards with metallic isolation has to be
connected to the central signal ground of the machine!
The individual expansion boards must also be connected to the central signal ground of the
machine via the grounding screw on the front panel.
Interface boards with and without metallic isolation must not be used together!
Either all boards are metallically isolated and X131 is wired, or all boards are not metallically
isolated and X131 is not wired!
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