F-Di Function - Siemens SINAMICS S120 Function Manual

For different signal states within a fail-safe F-DI of the TM54F, the signal states of the two
digital inputs of the F-DI are frozen at logical 0 (safety function selected) until a safe
acknowledgement has been carried out using an F-DI via parameter p10006 (SI
acknowledgement, internal event input terminal).
The monitoring time (p10002) for the discrepancy of the two digital inputs of an F-DI must,
under certain circumstances, be selected high enough so that switching operations do not
initiate an undesirable response and then require a safe acknowledgement. Therefore, the
signal states at the two related digital inputs (F-DI) must have the same state within this
monitoring time, otherwise the following fault message will be output F35151 TM54F:
Discrepancy error. This requires safe acknowledgement.
6.3.2

F-DI function

Description
Fail-safe digital inputs (F-DI) consist of two digital inputs. The cathode (M) of the optocoupler
is routed to the second digital input in order to allow the connection of an M-switching F-DO
output (the anode must be connected to 24 V DC).
Parameter p10040 is used to determine whether an F-DI is operated as NC/NC or NC/NO
contact. The status of DI can be read at parameter r10051 for the drive objects TM54F_MA
and TM54F_SL. The same bits of both drive objects are logically linked by AND operation
and return the status of the relevant F-DI.
Test signals from controls can be filtered out using parameters p9651/p9851 so that faults
are not incorrectly interpreted.
Explanation of terms:
NC contact / NC contact: to select the safety function, a "zero level" must be present on both
inputs.
NC contact / NO contact: to select the safety function, a "zero level" at input 1 and a "1 level"
at input 2 must be present.
The signal states at the two associated digital inputs (F-DI) must assume the same status
configured in p10040 within the monitoring time set in p10002.
In order to enable forced dormant error detection, connect the digital inputs of F-DI 0 ... 4
with the dynamic voltage supply L1+ and the digital inputs with F-DI 5 ... 9 to L2+ (for
additional information on forced dormant error detection, see the corresponding function
description in the chapter "Extended Functions").
In the SINAMICS S120/150 List Manual, function diagrams 2850, or 2851, show an overview
of the fail-safe inputs F-DI 0 .... 4, or F-DI 5 ... 9.
Safety Integrated
Function Manual, (FHS), 11/2009, 6SL3097-4AR00-0BP0
Control of the safety functions
6.3 Control via TM54F
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