OperationStop input
This state-controlled input evaluates the operation stop feedback signal from the standard PLC.
Data type: BOOL
Initial value: FALSE
According to the standard, the restart of the machine/system after the event of an error may only be initiated if all corresponding requirements are met. To achieve this, you are responsible for planning and implementing the startup behavior according to your risk analysis.
The risk analysis may result in two realization versions for the application:- Version 1: The manual reset function and the startup of the machine/system must be executed separately: the manual reset function is requested by the button, connected to the ResetIn input of the RESET function block, and the startup of the machine/system by a separate button.In this case, the OperationStop input supports the separation of the manual reset function and the startup of the machine/system, required in the standard, by evaluating the operation stop signal from the standard PLC for the creation of the reset signal at the ResetOut output of the SF_Reset function block.Connection: Connect this input in this application case to an operation stop feedback signal from the standard PLC, either directly or via other functions/function blocks.
- Version 2: The manual reset function and the startup of the machine/system may be executed together via a connected control device, i.e., the reset of the Safety PLC (i.e., of the safety-related code) and the startup of the machine is executed via one and the same button.In this case, the evaluation of the operation stop feedback signal from the standard PLC is not necessary.Connection: Connect this input in this application case to a TRUE constant.A connection to a constant TRUE value can result in immediately outputting a reset signal at the ResetOut output (depending on the state at the ResetIn input). Refer to the following warning.
WARNING
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Unintended start-up
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If the function block is activated (input Activate = TRUE), the possible values at this input lead to the following function block behavior:
Value | Description |
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TRUE | The system is in operation stop mode. By triggering the reset button, a manual reset function can be executed. |
FALSE | The system is not in the operation stop mode. A manual reset function can not be executed. |