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Description
43310
Logical device for a safe sensor with 2 conditionally interdependently acting contacts/channels
SF_IN_local_conditionally_dependent detects the switching states of the two input channels of the
local I/O interface (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 sequence of the signal changes of the two contacts/channels is monitored during switch-on
and switch-off. If the sequence of the signal change deviates from the set sequence, the logical
device changes to the locked error state. (Chan_B_first)
If both signal channels do not take the same switching status during the fixed time, the logical
device changes to the locked error state. (InvalidTime = const. = 140ms)
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 (→ S. 194).
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