Response when canceling safe communication

If the "Safe communication fault response" is not activated during a failure of the safe process data communication, all process data bits will be overwritten and processed with the substitute value "0". This means that all enabled safety subfunctions (including the STO safety subfunction) will be activated. This can lead to an abrupt stop of the system.

With activated "Safe communication fault response", the "SS1" fault response can be set and the corresponding SSx instance can be selected.

Before first establishment of the safe process data communication, all process data bits are set to the substitute value "0". After the safe process data communication is established and fails again, the process data bit of the set SSx instance will be set to "0". The additional process data bits of the STO, SOS, SDI, SLI, SLS, SSR, SLP, SLA, and SCA function retain the last value. All other process data bits are set to "0". After the SSx ramp has reached the final state of the STO function, all process data bits will be set to "0".

If "Safe communication fault response" is activated, if communication is interrupted, the response time until the STO safety subfunction is activated will be extended by the times of the parameterized SSx instance.