Mitsubishi Electric WS0-CPU0 - Page 201

Chapter 9
198
Logic programming – Function blocks
Function block parameters
Parameters Possible values
Input mode  Equivalent
 Complementary
Evaluation mode  Dual channel
 Dual channel/AND mode
Max. time for AND
mode
0 = infinite, 1 to 60000 s
Discrepancy time on
switching on
 Without
 With
Discrepancy time on
switching off
 Without
 With
Discrepancy time 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
Off-delay timer input  Without
 With
Off-delay 0 to 10 s in 10 ms increments.
If the value is not 0, the value must be greater than the logic
execution time.
Use outputs Status
input A and Status input
B
 Without
 With
Use Fault present  Without
 With
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 Input B State of the tolerant dual channel monitor
Equivalent 0 0 Inactive
0 1 Discrepant, Input A switched off
1 0 Discrepant, Input B switched off
1 1 Active, if correct sequence has been followed
Complementary 0 1 Inactive
0 0 Discrepant, Input A switched off
1 1 Discrepant, Input B switched off
1 0 Active, if correct sequence has been followed
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