BECKHOFF EL6900-FB - Manual (Page 49)

Function blocks
Function blocks for TwinSAFE logic terminals 47
3.7.2 Signal description
Table 3-31: FB TWO-HAND inputs
Name Permitted type Description
Twohand1 TwinSAFE-In
FB-Out 1 st input channel. The parameterization determines, whether the
input is linked to a normally closed contact (safe state will be
requested by logical 0) or normally open contact (safe state will
be requested by logical 1).
Twohand2 TwinSAFE-In
FB-Out 2 nd input channel, behaves like Twohand1
If the discrepancy time is not equal 0, the 1 st and 2 nd input
channel are considered to be the 1 st input group and a
discrepancy time monitoring is carried out between both
channels, if one of the two input channels requests the safe
state.
Twohand3 TwinSAFE-In
FB-Out 3 rd input channel or 1 st input channel of the 2 nd input group,
otherwise corresponds with Twohand1
Twohand4 TwinSAFE-In
FB-Out 4 th input channel or 2 nd input channel of the 2 nd input group,
otherwise corresponds with Twohand2
Table 3-32: FB TWO-HAND outputs
Name Permitted type Description
Error TwinSAFE-Out
FB-In
Standard-Out TRUE:
The discrepancy time monitoring for a 2-channel input group has
detected an error. The error must be acknowledged via the
ERR_ACK input of the corresponding TwinSAFE group
FALSE:
No error was found
TwoHandOut TwinSAFE-Out
FB-In
Standard-Out 1 st output channel, the safe state corresponds to a logical 0.
Table 3-33: FB TWO-HAND input and output types
Type Description
TwinSAFE-In TwinSAFE input at an EL1904/KL1904
Standard-In Standard PLC variable (output in the PLC %Q*)
FB-Out TwinSAFE FB output
TwinSAFE-Out TwinSAFE output at an EL2904/KL2904
Standard-Out Standard PLC variable (input in the PLC %I*)
FB-In TwinSAFE FB input