S_Unlock input

State-controlled input for locking/unlocking mode selector switching (S_Mode0 to S_Mode7).

Data type: SAFEBOOL
Initial value: SAFEFALSE

Connection: Connect this input to a switch (e.g., a key switch) connected to the Sicherheitssteuerung. Constant SAFETRUE or SAFEFALSE values are permitted.

Hinweis
If a connection is made to the SAFEFALSE constant, the operating mode cannot be switched.

Value Description

SAFEFALSE Operating mode switchover is locked.
In the locked state, a TRUE at AutoSetMode or a positive signal edge at S_SetMode does not cause the input values (S_Mode0 to S_Mode7) to be accepted at the outputs (S_Mode0Sel to S_Mode7Sel).
In this state, the status of S_Mode0Sel to S_Mode7Sel cannot be modified.

SAFETRUE Operating mode switchover is not locked.
In the unlocked state, a TRUE at AutoSetMode or a positive signal edge at S_SetMode does cause the input values (S_Mode0 to S_Mode7) to be accepted at the outputs (S_Mode0Sel to S_Mode7Sel).

Value	Description
SAFEFALSE	Operating mode switchover is locked. In the locked state, a TRUE at AutoSetMode or a positive signal edge at S_SetMode does not cause the input values (S_Mode0 to S_Mode7) to be accepted at the outputs (S_Mode0Sel to S_Mode7Sel). In this state, the status of S_Mode0Sel to S_Mode7Sel cannot be modified.
SAFETRUE	Operating mode switchover is not locked. In the unlocked state, a TRUE at AutoSetMode or a positive signal edge at S_SetMode does cause the input values (S_Mode0 to S_Mode7) to be accepted at the outputs (S_Mode0Sel to S_Mode7Sel).

The input signals are only evaluated for permissible signal combinations (only one input SAFETRUE at the same time, not all inputs SAFEFALSE) if the operating mode switchover is not locked with S_Unlock = SAFEFALSE.

WARNUNG

Non-conformance to safety function requirements

Verify the impact of a locked mode selector switching on your machine or process prior to implementation.

Make certain that appropriate procedures and measures (according to applicable sector standards) have been established to help avoid hazardous situations when the operating mode switchover is locked by S_Unlock = SAFEFALSE.