Mitsubishi Electric Q01UCPU User Manual page 524

(4)
Replacement example of the CHKST and CHK instructions
In the example below, if the replacement program for the CHKST and CHK instructions detects a failure, a failure
number (contact number + coil number) is stored in D200 and the annunciator F200 is turned on.
(a) Example of device assignment
Advance end detection sensor input 1
Retract end detection sensor input 1
Advance end detection sensor input 2
Retract end detection sensor input 2
Advance end detection sensor input 3
Retract end detection sensor input 3
Advance end detection sensor input 4
Retract end detection sensor input 4
Failure detection output 1
Failure detection output 2
Failure detection output 3
Failure detection output 4
If the device numbers in the example above are used for other applications, assign unused device numbers
instead.
When the advance end detection sensor input performs a failure detection of Xn, assign device numbers for
the retract end detection sensor input and the failure detection output as described below.
Advance end detection sensor input
Retract end detection sensor input
Failure detection output
(b) Program before replacement
522
Before replacement
Application
X
X
Y
Device
X100 Advance end detection sensor input 1
X101 Retract end detection sensor input 1
X102 Advance end detection sensor input 2
X103 Retract end detection sensor input 2
X104 Advance end detection sensor input 3
X105 Retract end detection sensor input 3
X106 Advance end detection sensor input 4
X107 Retract end detection sensor input 4
Y100 Failure detection output 1
Y102 Failure detection output 2
Y104 Failure detection output 3
Y106 Failure detection output 4
Coil number (failure type detected)
Contact number
Failure number
Failure detection display
For index modification
n
n+1
n
After replacement
Application Device
X100
X101
X102
X103
X104
X105
X106
X107
Y100
Y102
Y104
Y106
D100
D101
D200
F200
Z0