7. APPLICATION INSTRUCTIONS
7 − 130
MELSEC-A
Operation Errors In the following cases, operation error occurs and the PC CPU stops operation.
• When parallel circuits are provided:
• When NOP is contained:
• When label P254 is not contained:
• When the number of contact points exceeds 150:
• When there is no circuit block of CJ:
POINT
Operation error occurs when the NOP instruction is in the format determined
by the CHK instruction.
Check the NOP instruction in list mode because it is not displayed in the
ladder mode of GPP.
Bit device specified at (D1).
Label
P254
CJ P
CHK (D1) (D2)
CJ P
CHK (D1) (D2)
P254
Eliminate parallel contacts.
Eliminate parallel contacts
in the circuit block of CJ.
CJ P
CHK (D1) (D2)P254
Delete NOP.
(LDI and ANI substitute NOP.)
NOP
Not displayed in ladder mode.
CJ P
CHK (D1) (D2)
Insert label P254.
CJ P
CHK (D1) (D2)
Reduce contact points below 150.
P254
151 or more contact points
CHK (D1) (D2)
Add a circuit block of CJ.
P254
To Next Page
Loading...
Need help?
General
