Siemens SINAMICS S120 Function Manual page 247

● Adjustable time window for monitoring discrepancy at both digital inputs by means of
parameter p10002 for all F-DIs
Note
Discrepancy time
To avoid incorrect triggering of fault messages, at these inputs the discrepancy time must
always be set less than the shortest time between 2 switching events (ON/OFF,
OFF/ON).
Further notes for setting the discrepancy time (also see the following diagram
"Discrepancy time") are provided in the "SINAMICS S120/S150 List Manual" for the
following message:
– F01611 (Basic Functions)
– C01770 (Extended/Advanced Functions)
T
T
T
Figure 5-8
● 2nd digital input with additional tap of the optocoupler cathode for connecting an output of
a failsafe control grounded through a switch.
More information on this topic is available on the Internet at:
Parameterizing and configuring safety hardware
(https://support.industry.siemens.com/cs/ww/en/view/39700013)
Safety Integrated
Function Manual, 12/2018, 6SL3097-5AR00-0BP1
5.6 Control of the Extended/Advanced Functions via F-DI (for CU310-2)
Switching interval
S
Discrepancy time
D
Response time
R
Discrepancy time
WARNING
Unwanted movement due to incorrect signal states as a result of diagnostic currents in
the switched-off state (logical state "0" or "OFF")
Unlike mechanical switching contacts, e.g. emergency stop switches, diagnostic
currents can also flow when the semiconductor is in the switched-off state. If
interconnection with digital inputs is faulty, the diagnostic currents can result in incorrect
switching states. Incorrect signal states of digital inputs can cause unwanted
movements of machine parts and result in serious injury or death.
• Observe the conditions of digital inputs and digital outputs specified in the relevant
manufacturer documentation.
• Check the conditions of the digital inputs and digital outputs with regard to currents in
the "OFF" state and if necessary connect the digital inputs to suitably dimensioned,
external resistors to protect against the reference potential of the digital inputs.
Control of the safety functions
245