Mitsubishi Electric WS0-CPU0 Operating Manual page 201

Table 87:
Parameters for the tolerant
dual channel monitor
function block
Table 88:
State of the tolerant dual
channel monitor as a
function of the input mode
Logic programming – Function blocks
Function block parameters
Parameters
Input mode
Evaluation mode
Max. time for AND
mode
Discrepancy time on
switching on
Discrepancy time on
switching off
Discrepancy time
Off-delay timer input
Off-delay
Use outputs Status
input A and Status input
B
Use Fault present
Dual channel monitor
The value necessary on the two signals to achieve the required state depends on
the Input mode selected. There are two possibilities:
 equivalent evaluation
 complementary sampling
Input mode Input A
Equivalent 0
0
1
1
Complementary 0
0
1
1
Possible values
 Equivalent
 Complementary
 Dual channel
 Dual channel/AND mode
0 = infinite, 1 to 60000 s
 Without
 With
 Without
 With
0 = infinite, 10 ms to 60 s in 10 ms increments.
If the value is not 0, the value must be greater than the logic
execution time
 Without
 With
0 to 10 s in 10 ms increments.
If the value is not 0, the value must be greater than the logic
execution time.
 Without
 With
 Without
 With
Input B State of the tolerant dual channel monitor
0 Inactive
1 Discrepant, Input A switched off
0 Discrepant, Input B switched off
1 Active, if correct sequence has been followed
1 Inactive
0 Discrepant, Input A switched off
1 Discrepant, Input B switched off
0 Active, if correct sequence has been followed
Chapter 9
198