SmartPLC SafeLine AC4S with fieldbus interfaces
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SF_IN_local_dependent_filter_ntestreq
43090
Interface type:
Local I/O interface (input)
Library:
sf_logicalinterfaces.library
Symbol in CODESYS:
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Description
43309
Logical device for a safe sensor with 2 interdependently acting contacts/channels
SF_IN_local_dependent_filter_w_testreq detects the switching states of the two input channels
(IN_Channel_A, IN_Channel_B). The logical device forms the logical AND connector from the two
values and provides the result as safe control signal. The following additional conditions apply for the
logical signal evaluation:
The contacts/channels are debounced during switch-on: Signal changes that are applied shorter
than the set stabilisation time do not lead to a change in state. (StabilisingTime)
If the signal states are not equal for a longer time than the set synchronisation time, both
contacts/channels have to take the value FALSE simultaneously before switch-on is possible
again. (SynchTime)
Simultaneity of the signal change of the two contacts/channels is monitored during switch-on: If
both contacts/channels take the value TRUE again during the switch-off process, switch-on occurs
at once. When the tolerance time has elapsed, the two contacts/channels have to take the value
FALSE again simultaneously before switch-on is possible again. (ToleranceTime)
If after the start the two contacts/channels do not take a valid signal state within a firmly set time,
the logical device changes to the locked error state. (InvalidTime = const. = 140 ms)
If during switching both signals are longer invalid than the set stabilisation time, the logical device
changes to the locked error state. (StabilisingTime)
The programmer can activate the following functions as option:
EnableIN_Test:
A test signal for cross-fault monitoring generated at a local output channel at the local I/O interface
is evaluated.
StartupTest:
Both signal channels must take the state FALSE simultaneously before the logical device can start
with the signal evaluation.
DisableLogging:
Only error events are transmitted to the online support centre (OSC) of the AC4S user interface.
If cross-fault detection is activated for 2-channel safe devices at the local I/O interface
(EnableIN_Test = TRUE), the following applies:
Signal change at the inputs (IN_Channel_A, IN_Channel_B) must be applied longer than the
cycle time of the test pulses (3 PLC cycles). Otherwise the logical device changes to the
locked error state.
To reset the logical device from the locked error state and to read diagnostic information of the
logical device:
→
CtrlLocalInputs
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