ABB AC500-S Application Note page 12
Safety programmable logic controllers
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Also See for AC500-S:
- Safety user manual (452 pages) ,
- System manual (119 pages) ,
- Operation manual (31 pages)
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Application Note for "Usage of AC500 digital standard I/Os in functional safety applications up to PL c (ISO 13849-1)", V1.0.0
Figure 5. Exemplary realization of cyclic test stimulus by dynamic change of the input
signals using AC500 digital standard I/O module
In Figure 5, Channel C16 of DC523 is configured as an output and Channel C0 is
configured as an input. Test pulses (for example, with LOW phase duration of 10 ms,
HIGH phase duration of 50 ms and a period of 60 ms) are generated on Channel C16
using PM573 application program and are read back through Channel C0 to which
normally-closed position switch S1 is connected. Using DPRAM data exchange (two
options are available, refer to [1] and [2], respectively), one can transfer the observed
signal pattern to SM560-S Safety CPU for supervision. If the test pulse pattern (both
LOW and HIGH phases are supervised) is not available, the safety reaction is triggered
to stop the machine, e.g., through DX581-S digital safety input/output module.
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