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IO Signal Forcing

For maintenance reasons, it may be desirable to force an input or an output signal to a certain fixed state, e.g. when exchanging a defective input sensor. This allows the sensor to be exchanged without affecting the continuation of the production. During the exchange, the applicable input is forced to its normal operational state. While being desirable in some situations, forcing a signal to a specific, fixed value may also create a potentially hazardous condition.

Safety Manager™ provides a force function which supports maintenance personnel in applying forces consciously. It only allows forcing of signals that were specifically selected during the system design. During operation, the system is protected against unauthorized forces via a key switch. Forcing of Safety Manager signals is only possible via Safety Builder, using a passwordprotected software function. All forcing actions are included in Safety Manager event reports for trace ability purposes.

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