Troubleshooting; L Err. Indicator Blinking; L Err. Indicator On; L Run Indicator Off - M-system R1C-GH Instruction Manual

13. TROUBLESHOOTING

Basic troubleshooting methods are explained in this section.
For problems concerning the PLC CPU and Master Unit, consult users manuals for these units.

13.1. L ERR. INDICATOR BLINKING

CHECK
Have you changed the station No. and/or baud rate settings
during normal operation?

13.2. L ERR. INDICATOR ON

CHECK
Are the station No. and/or baud rate settings correct?

13.3. L RUN INDICATOR OFF

Consult the users manual for the Master Unit.

13.4. UNABLE TO READ/WRITE DIGITAL VALUES?

CHECK
Is the L RUN indicator OFF?
Is the L ERR. indicator blinking or ON?
Is the RUN indicator on the PLC CPU blinking or OFF?
Is the RUN indicator on the Master Unit OFF?
Are the RD/SD indicators on the Master Unit ON?
Are the wires for analog I/O properly connected to respective
terminals? No wire breakdown?
Remove analog input wires and apply test voltage to the termi-
nals (e.g. Use a dry cell). Try to read out digital value.
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Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: info@m-system.co.jp
TROUBLESHOOTING
Return these settings to the state when the unit operated
normally.
TROUBLESHOOTING
Set them correctly.
TROUBLESHOOTING
Refer to Section "13.3. L RUN INDICATOR OFF".
Consult the users manual for the Master Unit.
Consult the users manual for the CPU.
Consult the users manual for the Master Unit.
Consult the users manual for the Master Unit.
Check these wires visually or check conductivity for each pair
of wires.
If the digital value is read out normally, there are possibili-
ties of noise interference via external wires. Check wiring and
grounding.
R1C-GH
EM-5956 Rev.11 P. 12 / 13