State-controlled inputs for the status of the connected two-channel switch or sensor.
Data type: SAFEBOOL
Initial value: SAFEFALSE
In order to switch the S_EquivalentOut output to SAFETRUE, the S_ChannelA and S_ChannelB input must both be SAFETRUE at the same time (taking the time set at DiscrepancyTime into account when switching to SAFETRUE).
Connection: Connect these inputs to the two-channel switch or sensor connected to the Safety Logic Controller. Constant TRUE or FALSE values are not permitted.
Closed-circuit current principle: Connect the signal of an N/C contact to each of the two inputs if you want the S_EquivalentOut output to display a SAFETRUE signal when the contacts are not activated (closed-circuit current principle).
Operating current principle: Connect the signal of an N/O contact to each of the two inputs if you want the S_EquivalentOut output to display a SAFETRUE signal when the contacts are not activated (operating current principle).
Both inputs must always be connected to the same type of contact:
- either N/O contact to S_ChannelA and S_ChannelB
- or N/C contact to S_ChannelA and S_ChannelB
|
Value |
Description |
|---|---|
|
SAFETRUE |
Request to switch S_EquivalentOut to SAFETRUE. |
|
SAFEFALSE |
Request to switch S_EquivalentOut to SAFEFALSE. |
If both S_ChannelA and S_ChannelB inputs switch to the SAFETRUE value within the set discrepancy time, the S_EquivalentOut output switches to SAFETRUE. The S_EquivalentOut output remains SAFETRUE for as long as both inputs have the SAFETRUE value.
The discrepancy time is exceeded if different states are present at the inputs (S_ChannelA and S_ChannelB) once the time set at DiscrepancyTime has elapsed. This results in an error message (Error = TRUE). In such cases, the function block always switches to the defined safe state (S_EquivalentOut = SAFEFALSE).