User manual

Berghof Automationstechnik Analog I/O expansion module
2VF100051FE01.doc 2D0172002ZD00.DOC 17
2.7.1. Fault currents
A large number of the conceivable incorrect assignments of analog connections can
be resolved by means of circuit organisation.
Nonetheless, it is not economically possible with the components available today to
guarantee absolute protection against all fault currents that can be implanted from
outside.
Caution
Faulty wiring, incorrect power supply or high potential differences in the measuring
circuits can cause serious damage to the module or permanently impair measur-
ing accuracy.
2.7.2. Commissioning
All connections should be re-checked for correct wiring and polarity the supply
voltage is applied.
The handling of the module depends on the software environment used. For this
reason, you should consult the information in the programming manuals for the
CP1131 or CPC++, as appropriate.
2.7.3. Initialisation and module identification
The analog expansion module is identified and initialised by the operating system of
the upstream Cell Controllers. The identification characteristics stored in the module
are evaluated by the Cell Controller for this purpose.
No dip switch settings are required. In the case of failure of the +24 V power supply
or interruption of the E bus transmission, the analog outputs are reset to 0 V
(LED “OUT_ENA”).