Fail-Safe Digital Input - Siemens SINAMICS G120 Operating Instructions Manual

Adapting the terminal strip

7.2 Fail-safe digital input

7.2 Fail-safe digital input
This manual describes the STO safety function with control via a fail-safe input. All other
safety functions, further fail-safe digital inputs of the converter and the control of the safety
functions via PROFIsafe are described in the Safety Integrated Function Manual.
Specifying the fail-safe input
If you use the STO safety function, then you must configure the terminal strip during the
basic commissioning for a fail-safe input, e.g. with p0015 = 2 (see Section Selecting the
interface assignments (Page 44)).
The converter combines digital inputs DI 4 and DI 5 to form a fail-safe input.
Terminals of the fail-safe digital
input
Connect devices
A fail-safe input is designed for the following devices:
● Direct connection of safety sensors, e.g. EMERGENCY STOP command devices or light
● Pre-processing safety relays, e.g. fail-safe controllers.
Permitted sensors and signals
The fail-safe input of the converter
is designed for connecting sensors
with two NC contacts.
If you interconnect pre-processing safety relays via two separate cables with the converter,
the two transferred must always have the same signal state.
The converter expects the following signals at its fail-safe input:
● High signal: Fail-safe input is not active.
● Low signal: Fail-safe input is active.
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curtains.
Function
You must enable STO to select the STO safety function via FDI 0.
See also Section Fail-safe function Safe Torque Off (STO)
(Page 228).
Operating Instructions, 03/2012, FW V4.5, A5E02999804B AB
SINAMICS G120C frequency converter