Control Of The Extended Functions Using Safe Input Terminals - Siemens Sinamics S110 Function Manual

8.6.2

Control of the Extended Functions using safe input terminals

General information
Control Unit CU305 has 6 digital inputs, which can be used as 3 safe input terminal pairs (F-
DI) for controlling the Extended Functions.
Furthermore, a single digital output on the CU305 can be extended as a safe output terminal
pair (F-DO) and used for the Extended Functions.
● F-DI 0 = DI16/DI17
● F-DI 1 = DI18/DI19
● F-DI 2 = DI20/DI21
● F-DO 0 = DO16+/DO16-
The signal states of the two digital inputs of the F-DI are frozen at logical 0 (safety function
selected) when different signal states are present within a failsafe F-DI, until a safe
acknowledgment has been carried out by means of an F-DI via parameter p10006 (SI
acknowledgment internal event input terminal) or the extended alarm acknowledgment has
been carried out.
The monitoring time (p10002) for the discrepancy of the two digital inputs of an F-DI may
have to be increased so that switching operations do not trigger an undesired response,
thereby necessitating a safe acknowledgment. The signal states at the two related digital
inputs (F-DI) will need to have the same state within this monitoring time or fault message
C01770/C30770 will be triggered. This requires safe acknowledgment.
Function Manual
Function Manual, 01/2011, 6SL3097-4AB10-0BP3
Safety Integrated Functions
8.6 Controlling the safety functions
415