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MELSEC-Q
8 TROUBLESHOOTING
(2) Example of checking SW009C to SW009F
An example of incorrect cable connection at Station No. 2 is shown below.
(a) Wiring diagram
(b) SW009C to SW009F status
Station No. SW009C to SW009F status
Station No. 1 Only Station No. 2 (bit 1) is ON or OFF.
Station No. 3
Station No. 4
Station No. 2
All stations (bit 0, bit 2, bit 3) other than Station No. 2 (bit 1) are ON or OFF.
QCPU QJ71LP21-25
IN OUT
QCPU QJ71LP21-25
IN OUT
QCPU QJ71LP21-25
IN OUT
QCPU QJ71LP21-25
IN OUT
Station No. 1 Station No. 2 Station No. 3 Station No. 4
Cables are connected to wrong connectors
at Station No. 2 (connected OUT-OUT with
Station No. 1 and IN-IN with Station No. 3).
0100
b0b1b2b3
0
b15 b4to
SW009C
0SW009D
0SW009E
0SW009F
1011
b0b1b2b3
0
b15 b4to
SW009C
0SW009D
0SW009E
0SW009F
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