Technical data

Safety Integrated Functions
8.6 Controlling the safety functions
Function Manual
Function Manual, 06/2012, 6SL3097-4AB10-0BP4
419
F-DI features
● Failsafe configuration with two digital inputs per F-DI
● Input filter for test signals with an adjustable gating time (p10017/p10117)
● Configurable connection of NC/NC or NC/NO contacts by means of parameter
p10040/p10140
● Status parameter r0722, r10051/r10151
● Adjustable time window for monitoring discrepancy at both digital inputs by means of
parameter p10002/p10102 for all F-DIs
Note
To avoid incorrect triggering of fault messages, on these inputs the discrepancy time
must always be set less than the shortest time between two switching events (ON/OFF,
OFF/ON).
● 2. Digital input with additional tap of the optocoupler cathode for connecting an M-
switching output of a failsafe controller.
WARNING
In contrast to mechanical switching contacts (e.g. Emergency Stop switches), leakage
currents can still flow in semiconductor switches such as those usually used at digital
outputs even when they have been switched off. This can lead to false switching states
if digital inputs are not connected correctly.
The conditions for digital inputs/outputs specified in the relevant manufacturer
documentation must be observed.
WARNING
In accordance with IEC 61131 Part 2, Chapter 5.2 (2008), only outputs that have a
maximum residual current of 0.5 mA when "OFF" can be used to connect CU305 digital
inputs with digital semiconductor outputs.
The inclusion of additional load resistors makes it possible to use digital outputs with
larger residual currents to connect CU305 inputs.