BECKHOFF EL6900-FB - Manual (Page 12)

System description
10 Function blocks for TwinSAFE logic terminals
linked.
Apart from this the TwinSAFE group has an input (RUN), with which the processing of the assigned
function blocks can be stopped and started. All TwinSAFE group assigned outputs are in a safe state
when stopped.
2.1.1.1 TwinSAFE group inputs and outputs
Table 2-1: TwinSAFE group inputs
Name Permitted type Description
RUN FB-Out
Standard-In
TRUE:
The function blocks assigned to the TwinSAFE group are executed
FALSE:
All assigned function blocks of the TwinSAFE group are at a STOP
state and thus all associated outputs are in a safe state
When the input is not linked it is in the TRUE 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.
Table 2-2: TwinSAFE group outputs
Name Permitted type Description
FB ERR TwinSAFE-Out
FB-In
Standard-Out
Local-Out
TRUE:
At least one assigned function block has an error
FALSE:
All assigned function blocks have no errors
COM ERR TwinSAFE-Out
FB-In
Standard-Out
Local-Out
TRUE:
At least one TwinSAFE connection of TwinSAFE group has an error
FALSE:
All TwinSAFE connections of the TwinSAFE group have no errors
OUT ERR TwinSAFE-Out
FB-In
Standard-Out
Local-Out
TRUE:
At least one local output assigned to the TwinSAFE group has an
error
FALSE:
All of the local outputs assigned to the TwinSAFE group have no
errors
Always FALSE for EL6900, since the device has no local outputs.