5.6.3 Terminals for STO, SS1 (time-controlled), SBC
Safety functions STO, SS1 (time-controlled) and SBC are selected/deselected separately for
each drive using 2 terminals.
Basic procedure
The functions are separately selected/deselected for each drive using two terminals.
1. Switch-off signal path, Control Unit:
– Input terminal for Safe Torque Off (STO):
Selected using BICO interconnection (BI: p9620[0]).
– Possible signal sources:
CU320-2: Digital input DI 0…7
2. Motor Module shutdown path
The input terminal is the "EP" terminal ("Enable Pulses").
The EP terminal is periodically interrogated with a sampling time, which is rounded off to an
integer multiple of the current controller cycle; however, it is a minimum of 1 ms. (Example: t
i
= 400 µs, t
EP
=> 3x, t
i
= 1.2 ms)
Both terminals must be energized within the tolerance time p9650/p9850 (Page 216),
otherwise a fault is output.
5.6.4 Grouping drives
To ensure that the safety function for several drives can be initiated simultaneously, you must
group the terminals for the corresponding drives.
Note
Response of the "STO" safety function when grouping
If a fault in a drive results in a "Safe Torque Off" (STO), this does not automatically mean that
the other drives in the same group also switch to "Safe Torque Off" (STO).
Basic procedure
Proceed as follows to group the corresponding drives:
1. Switch-off signal path, Control Unit
Group by appropriately interconnecting the binector input to the common input terminal for
the drives belonging to a group.
2. Motor Module switch-off signal path
Group by appropriately connecting terminal "EP" for the individual Motor Modules belonging
to a group.
Controlling safety functions integrated in the drive
5.6 Control via terminals on the Control Unit and Motor/Power Module
Safety Integrated (with SINAMICS S120)
Commissioning Manual, 02/2020, A5E46305916B AB 215
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