Beckhoff TwinSAFE logic FB

Function blocks
Function blocks for TwinSAFE logic components 195
3.27.2 Signal description
Table 3-163: FB SLI inputs
Name
Permitted type
Data type
Description
SLI
TwinSAFE-In
FB-Out
TwinSAFE SC
BOOL
Input for activating the function and saving the
current position.
Position
TwinSAFE-In
FB-Out
TwinSAFE SC
INT16
INT32
UINT16
UINT32
Position value. Is set with a rising edge at SLI
stored and compared with the saved position
as long as SLI remains set. The difference is
output at PositionDiff.
Table 3-164: FB SLI outputs
Name
Permitted type
Data type
Description
Error
TwinSAFE-Out
FB-In
Standard-Out
BOOL
Error output (see diagnostic information)
SLIActive
TwinSAFE-Out
FB-In
Standard-Out
BOOL
SLIActive is set if SLI is TRUE and PositionDiff
is within the defined limits.
PositionDiff
TwinSAFE-Out
FB-In
Standard-Out
INT16
INT32
The difference between the saved position
(LatchPosition) and the current position is
output. PositionDiff is set to 0 if SLIActive is
FALSE.
Table 3-165: Input and output types
Type
Description
TwinSAFE-In
TwinSAFE input of an EL1904/KL1904, e.g.
Standard-In
Standard PLC variable (output in the PLC %Q*)
FB-Out
TwinSAFE FB output
TwinSAFE-Out
TwinSAFE output of an EL2904/KL2904, e.g.
Standard-Out
Standard PLC variable (input in the PLC %I*)
FB-In
TwinSAFE FB input
TwinSAFE SC
Input of a TwinSAFE connection (TwinSAFE SC technology)
Table 3-166: FB SLI parameters
Parameter
Description
Limit pos
Permitted deviation of the saved position (LatchPosition) in positive
direction (UINT32)
Limit neg
Permitted deviation of the saved position (LatchPosition) in negative
direction (UINT32)
Table 3-167: Internal identifier of the FB
Type
Description
FB SLI
This description applies to BLG 1.0 (internal version number)