Reset input

Edge-triggered input used for the following purposes:

Resetting error messages when the cause of the error is no longer present.
Manually resetting a restart inhibit set using S_AutoReset (see EN ISO 13849-1).

Data type: BOOL

Initial value: FALSE

The Reset input supports manual resetting of a restart inhibit by the operator (see EN ISO 13849-1).

NOTE:

Resetting does not occur with a negative (falling) edge, as specified by the EN ISO 13849-1 standard, but with a positive (rising) edge.

Additional measures, e.g., an additional function stop, can be taken to reduce the risk of an unintended restart.

Connection: With the signal of a reset button connected to the Safety Logic Controller (value TRUE or FALSE). Constant TRUE or FALSE values are not permitted.

WARNING
	UNINTENDED EQUIPMENT OPERATION Make certain that the Reset input is not connected to any other device than a suitable manual reset device. Failure to follow these instructions can result in death, serious injury, or equipment damage.

Value	Description
FALSE	Error resetting and removal of an active restart inhibit are not requested.
Edge FALSE > TRUE	Error resetting and removal of an active restart inhibit are requested. The function block performs internal edge monitoring for the Reset input. A reset is only executed on a positive signal edge. A further static TRUE signal after a positive signal edge has no effect. Refer to the first hazard message below this table.

Resetting the function block by means of a positive signal edge at the Reset input can cause the S_EnableSwitchOut output to switch to SAFETRUE immediately (depending on the status of the other inputs).

WARNING
	UNINTENDED START-UP Include in your risk analysis the impact of the reset by means of a positive signal edge at the Reset input. Make certain that appropriate procedures and measures (according to applicable sector standards) have been established to help avoid hazardous situations when resetting. Do not enter the zone of operation when resetting. Ensure that no other persons can access the zone of operation when resetting. Use appropriate safety interlocks where personnel and/or equipment hazards exist. Failure to follow these instructions can result in death, serious injury, or equipment damage.

WARNING

UNINTENDED START-UP

Include in your risk analysis the impact of the reset by means of a positive signal edge at the Reset input.
Make certain that appropriate procedures and measures (according to applicable sector standards) have been established to help avoid hazardous situations when resetting.
Do not enter the zone of operation when resetting.
Ensure that no other persons can access the zone of operation when resetting.
Use appropriate safety interlocks where personnel and/or equipment hazards exist.

Failure to follow these instructions can result in death, serious injury, or equipment damage.

If you have not activated a restart inhibit (S_AutoReset = SAFETRUE), a manual reset does not have to be performed following error removal. In such cases, the error message is confirmed automatically once the error is removed.

WARNING
	UNINTENDED START-UP Include in your risk analysis the impact of removing the cause of an error with regard to the automatic reset and restart of the machine if the restart inhibit is deactivated (S_AutoReset = SAFETRUE). Make certain that appropriate procedures and measures (according to applicable sector standards) have been established to help avoid hazardous situations when removing the source of an error if the restart inhibit is deactivated. Do not enter the zone of operation when removing an error under this condition. Ensure that no other persons can access the zone of operation when removing an error under this condition. Use appropriate safety interlocks where personnel and/or equipment hazards exist. Failure to follow these instructions can result in death, serious injury, or equipment damage.

WARNING

UNINTENDED START-UP

Include in your risk analysis the impact of removing the cause of an error with regard to the automatic reset and restart of the machine if the restart inhibit is deactivated (S_AutoReset = SAFETRUE).
Make certain that appropriate procedures and measures (according to applicable sector standards) have been established to help avoid hazardous situations when removing the source of an error if the restart inhibit is deactivated.
Do not enter the zone of operation when removing an error under this condition.
Ensure that no other persons can access the zone of operation when removing an error under this condition.
Use appropriate safety interlocks where personnel and/or equipment hazards exist.

Failure to follow these instructions can result in death, serious injury, or equipment damage.

NOTE:

If the function block is expecting a positive edge for resetting (restart inhibit is active or an error state applies), a static TRUE signal at Reset will be regarded as an error. In such cases, switch Reset to FALSE to exit the error state.