28 – 556 HEIDENHAIN Service Manual iTNC 530
Photo: Siemens E/R module with terminal X131
Grounding screw on
the front panel
The terminal X131 of the Siemens E/R module of boards with metallic isolation must
be connected to the central signal ground of the machine!
The individual interface 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 may not be used together!
Either all boards are galvanically isolated and X131 is wired or all boards are not galvanically
isolated and X131 is not wired!
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