S_EquivalentOut output

Output signal of the function block (enable signal).

Data type: SAFEBOOL

Following activation of the function block (with Activate = TRUE), the value of the output signal depends on the values at the function block inputs S_ChannelA and S_ChannelB, and also on whether or not the function block has detected an error.

Note
As the enable signal is present at the S_EquivalentOut output, this output is also referred to as the enable output.

Connection: Connect this output to other safety-related function blocks/functions.

The function block supports a safety-related monitoring function but not a safety-related control function.

WARNING

Unintended machine operation

Verify that the S_EquivalentOut enable signal does not directly control the safety process.

Validate the overall safety-related function, including the start-up behavior of the process, and thoroughly test the application.

Note
Permanent signals (S_ChannelA = SAFETRUE and S_ChannelB = SAFETRUE) at the inputs when the function block is activated (Activate = TRUE) or when the Safety PLC is started up switch the enable signal (S_EquivalentOut) to SAFETRUE.

Value Description

SAFETRUE The S_EquivalentOut output can only be SAFETRUE if the following conditions are met:

The function block has been activated (input Activate = TRUE)

and both inputs must be SAFETRUE

and both inputs must have switched to SAFETRUE within the time set at DiscrepancyTime

and the function block has not detected an error.

SAFEFALSE The S_EquivalentOut output is SAFEFALSE if

the function block is not activated (input Activate = FALSE)

or unless both of the inputs show the state SAFETRUE

or at least one input shows the state SAFEFALSE

or the inputs both show the state SAFETRUE, but the function block has detected an error (Error output = TRUE).

Value	Description
SAFETRUE	The S_EquivalentOut output can only be SAFETRUE if the following conditions are met: The function block has been activated (input Activate = TRUE) and both inputs must be SAFETRUE and both inputs must have switched to SAFETRUE within the time set at DiscrepancyTime and the function block has not detected an error.
SAFEFALSE	The S_EquivalentOut output is SAFEFALSE if the function block is not activated (input Activate = FALSE) or unless both of the inputs show the state SAFETRUE or at least one input shows the state SAFEFALSE or the inputs both show the state SAFETRUE, but the function block has detected an error (Error output = TRUE).