BECKHOFF EL6900-FB - Manual (Page 75)

Function blocks
Function blocks for TwinSAFE logic terminals 73
3.13 The TOF function block
3.13.1 Functional description
FB TOF is used to realize a switch-off delay. Logic 1 at input TofIn is transferred to the output with a set
delay time. The output remains activated if the input is set to 1 again before the switch-off delay time has
elapsed. The error output is inactive since the block sets no errors.
The maximum switch-off delay is 6000 x 100 ms (10 minutes).
Figure 3-33: TOF function block
Note
KL6904
The TOF block is not available in the KL6904.