Siemens SIMATIC ET 200pro - 10.7 Inputs

Setting functions
8.8 Safe Torque Off (STO) safety function
SIMATIC ET 200pro FC-2 converter
160 Operating Instructions, 04/2015, FW V4.7.3, A5E34257324B AB
In order to avoid an undesirable inverter response, a signal filter in the inverter suppresses
the off test of the F0 bus.
The filter increases the inverter response time. The inverter only selects the STO function
after the debounce time has elapsed.
Figure 8-25 Filter to suppress the off test of the F0 bus
Parameter
Description
p9651
STO debounce time
(factory setting: 1 ms)
Debounce time for the basic functions.
8.8.3.6
Setting the forced checking procedure (test stop)
Procedure
To set the forced checking procedure (test stop) of the basic functions, proceed as follows:
1. Select the advanced settings for STO.
2. Set the monitoring time to a value to match your application.
3. Using this signal, the inverter signals that a forced checking procedure (test stop) is
required.
Interconnect this signal with an inverter signal of your choice.
You have set the forced checking procedure (test stop) for the basic functions.
Description
The forced checking procedure (test stop) of the basic functions is an inverter self test. The
inverter checks its circuits to switch off the torque. If you are using the Safe Brake Relay, for
a forced checking procedure, the inverter also checks the circuits of this component.