S_TwoHandOut output

Control signal for stopping (stop request) or starting and maintaining machine operation.

Data type: SAFEBOOL

The state of this signal depends on the states at inputs S_Button1 and S_Button2 of the function block, and whether the function block is activated and has detected an error.

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

Connection: Connect the S_TwoHandOut output to an output terminal of your application, either directly or via other safety-related functions/function blocks.

The enable signal may only control the process directly if this does not adversely affect the safety-related function.

WARNING

Unintended machine operation

Verify that the enable signal only controls the process directly if this does not adversely affect the safety-related function.

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

Value Description

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

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

and both inputs switch from SAFEFALSE to SAFETRUE either simultaneously or consecutively (after both inputs had previously been SAFEFALSE at the same time)

and the function block does not detect any errors.

SAFEFALSE The S_TwoHandOut output is SAFEFALSE if

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

or one or both inputs are showing the SAFEFALSE state (i.e., none or only one button actuated)

or both inputs are SAFETRUE, but only one input had the initial state SAFEFALSE prior to this (only one button is actuated again; the other button was not released and remained actuated throughout)

or the function block has detected an error (output Error = TRUE).