Mitsubishi Electric WS0-CPU0 Operating Manual page 275

Table 114:
Dual-channel evaluation
Note
I/O modules
The following truth table describes the discrepancy conditions for the dual-channel
equivalent and the dual-channel complementary input evaluation:
Input A Input B
Evaluation
(I1, I3, (I2, I4,
type
I5, I7) I6, I8)
Equivalent 0
0
1
1
x
Comple- 0
mentary
0
1
1
x
*1 If the discrepancy time is active (> 0), the discrepancy timer is restarted on the first signal change
resulting in a discrepant status. If the discrepancy time is inactive (= 0), the discrepancy timer does
not start, i.e. a timeout will never occur.
*2 Unchanged = Last status is preserved.
*3 If the correct sequence has been observed.
For the change between the different states of the dual-channel evaluation the
following rules apply:
A dual-channel evaluation can only change to Active (the input of the safety I/O
module in the logic editor changes from Low to High), if ...
 since the last Active status at least once the status was Inactive, i.e. it is not
possible to switch from Active to Discrepant and back to Active, and
 the discrepancy time has not elapsed or the discrepancy time is deactivated.
If the correct sequence to reach the Active status has not been observed (i.e. if the
status has changed from Active to Discrepant to Active), WS0-XTIO and WS0-XTDI
modules with firmware V2.00.0 and higher will display this sequence error after 100
ms at the latest, if the discrepancy time has not elapsed earlier (i.e. if the discrepancy
time is set to 0 or to a value > 100 ms). Older modules will not display the sequence
error, although their input in the logic editor remains Low as well.
In case of a discrepancy error or sequence error the module will behave as follows:
 The MS LED of the affected module will start flashing
with firmware V1.xx.0:
with firmware ≥ V2.00.0:
 the LEDs of the affected inputs will start flashing
 the module's Status input data in the logic editor will be Low.
Resetting the error:
A discrepancy error (timeout) or sequence error is reset, if the Inactive status has
been reached.
Status of the
Discrepancy
dual-channel
*1
timer
evaluation
0 0 Inactive
< Discrepancy
1 Discrepant
time
< Discrepancy
0 Discrepant
time
1 0 Active
≥ Discrepancy
x
time (timeout)
1 0 Inactive
< Discrepancy
0 Discrepant
time
< Discrepancy
1 Discrepant
time
0 0 Active
≥ Discrepancy
x
time (timeout)
Red (1 Hz)
Red/Green (1 Hz)
Safety I/O
module input in
the logic editor
0
0
0
*3
1
Error 0
0
0
0
*3
1
Error 0
Green (1 Hz),
Chapter 10
Discrepancy
error
0
*2
Unchanged
*2
Unchanged
0
1
0
*2
Unchanged
*2
Unchanged
0
1
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