Beckhoff TwinSAFE logic FB User Manual

Function blocks
Function blocks for TwinSAFE logic components 41
3.3.4 Restart behavior
If exactly one OpIn input is TRUE and the Restart signal is TRUE, Start state (FB State 6) is assumed.
The detection of a change of the Restart signal from TRUE to FALSE triggers a check whether exactly
one OpIn input is still logical 1. The corresponding output is enabled if these criteria are met and the
function block is not in ERROR state.
NOTE
Restart input
The function block expects a button with make contact at the restart input.
CAUTION
Restart
If the risk and hazard analysis indicates that a restart is to be implemented in the safety controller, the
restart signal must be applied to a safe input.
The following diagram shows an error-free behavior with a change of the operation mode and subsequent
acknowledgement of the OPMODE function block via the restart input.
RESTART
OpIn1
OpIn2
OpOut2
FB State
State 1
State 3
State 6
State 1
OpOut1

Beckhoff TwinSAFE logic FB Specifications

General

Brand	Beckhoff
Model	TwinSAFE logic FB
Category	Industrial Electrical
Language	English