S_StartStopOverride input

State-controlled input for the request/removal of the override function by the operator.

Connection: Connect this input to a corresponding control device, e.g., a key switch or push button with temporary effect. Constant TRUE or FALSE values are not permitted.

Note
The control device (e.g., a key switch) must be activated for the duration of the override operation and return into its starting position when released.

Note
You have to place the control device in a position where the zone of operation can be watched!

The status at the S_StartStopOverride input has only an impact if an override operation is possible (output OverridePossible = TRUE).

When the function block is activated (input Activate = TRUE) and output OverridePossible = TRUE, i.e.,

no startup inhibit is active
and a muting error occurs
and the light grid is interrupted or one of the muting sensors detects an object,

then the possible values at this input lead to the following function block behavior:

Value

Description

SAFEFALSE

The override function is not requested.

If the override operation is interrupted by releasing the control device (S_StartStopOverride = SAFEFALSE), the override timer (MaxOverrideTime input) continues to run.

SAFETRUE

The override function is requested.

If the requirements for the override function are given (OverridePossible = TRUE):

the safety shutdown is temporarily deactivated, i.e., the S_AOPD_Out output switches to SAFETRUE,
the override timer (MaxOverrideTime) starts,
the OverrideActive output switches to TRUE.

Note
If the override operation is interrupted, although the muting error still exists, the S_AOPD_Out output switches to SAFEFALSE and the Error output to TRUE.

WARNING

Non-conformance to safety function requirements

Be sure that your risk analysis includes an evaluation of a manual override operation (S_StartStopOverride = SAFETRUE).
Observe the regulations given by relevant sector standards regarding the override operation.
Make certain that appropriate procedures and measures (according to applicable sector standards) have been established to help avoid hazardous situations when activating the override operation.