These state-controlled inputs evaluate the status of the connected buttons of the two-hand control device (as actuated or not actuated). The S_TwoHandOut output can only be switched to SAFETRUE if both inputs switch from SAFEFALSE to SAFETRUE synchronously or with a time offset of less than 500 ms and remain in this state.
Data type: SAFEBOOL
Initial value: SAFEFALSE
Connection: Connect these inputs to the buttons of the two-hand control device to be evaluated, either directly or via additional safety-related functions/function blocks. Constant SAFETRUE or SAFEFALSE values are not permitted.
If the function block is activated (input Activate = TRUE), the possible values at these inputs lead to the following function block behavior:
|
Value |
Description |
|---|---|
|
SAFETRUE |
If both inputs S_Button1 und S_Button2 switch from SAFEFALSE to SAFETRUE simultaneously or consecutively within a period of 500 ms (both of the buttons on the two-hand control device are pressed within 500 ms), the S_TwoHandOut output switches to SAFETRUE. The S_TwoHandOut output remains SAFETRUE for as long as both inputs have the SAFETRUE value. |
|
SAFEFALSE |
If at least one of the inputs is SAFEFALSE, output S_TwoHandOut = SAFEFALSE. |
The S_TwoHandOut output can only switch to SAFETRUE if both inputs have been in the SAFEFALSE state before.
Irrespective of whether there is a single-channel or two-channel connection between the buttons of the two-hand control device and the Safety Logic Controller, both inputs S_Button1 und S_Button2 are only connected to one signal each. When using two-channel buttons, each two-channel signal must be evaluated or monitored as follows:
Either through a suitable upstream safety-related function block, e.g., SF_Equivalent, if the button has two N/C contacts.
Or the evaluation of equivalence or antivalence must be performed in the safety-related input device, also see section "Application example".
A single-channel button design for category 3 is only permissible if the safety chain of the connected button of the two-hand control device satisfies the requirements of EN ISO 13849-1 up to category 3 in terms of single-channel applications. With this in mind, the following components in the safety chain need to be considered:
Safety Logic Controller, including programming (cross-circuit detection),
the connection and cabling between the Safety Logic Controller and the button of the two-hand operator panel, and
the complete two-hand operator panel.
Refer to the user documentation specific to the devices used in the safety chain for details of other measures which need to be taken.
| WARNING | |
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