BECKHOFF EL6930 - Manual (Page 31)

Operation
EL6930 29
4.2.7.1 TwinSAFE group signals
TwinSAFE group inputs
Name Permitted type Description
RUN FB-Out
Standard-In
TRUE: The function blocks assigned to the TwinSAFE group are
executed. When the input is not linked it is in the TRUE
state
FALSE: All of the TwinSAFE group assigned function blocks are at
a STOP state and thus all associated outputs are in a safe
state.
ERR Ack FB-Out
Standard-In
All pending errors in the assigned function blocks and in the
TwinSAFE connections are acknowledged by the FALSE->TRUE-
>FALSE signal sequence.