S5-115F Manual Rules Governing the Use of the S5-115F
10.9 Digital Inputs
When configuring the I/Os ( Vol. 2 of the Manual), you define an I/O type according to the
characteristics of the process input signals for every DI.
There are three different DI types.
10.9.1 Implementation of Sensors
Permanently failsafe sensors may have a single-channel connection to a safety-related digital
input (requires permit). Other approved sensors must be of the two-channel type.
10.9.2 Requirements to be Met by the Sensor Signals
If the digital inputs are read in cyclically, the sensor signals must maintain a given state for longer
than one PLC cycle.
Note
Special conditions and restrictions apply to interrupt DIs ( 10.9.8).
EWA 4NEB 811 6148-02
10-17
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