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Troubleshooting
10.2 What to DO If an Error Occurs
(For Each Communication Mode)
10.2.1 When Using PLC Link Function
What to do If an error occurs
Situation
Communication is not
possible.
(For the serial
communication unit, the
ERROR LED turns on.)
(Note) For checking communication parameters with PMGET instruction, the CPU should be set in the RUN mode.
Set "Mode selection when self-diagnostic error occurs - A unit error occurred." to "Continue operation" in the
CPU configuration.
10.2.2 When Using MEWTOCOL/ MEWTOCOL7/ MODBUS-RTU Function
What to do if an error occurs
Situation
Communication is not
possible.
(For the serial
communication unit, the
ERROR LED turns on.)
Communication is not
possible when SD/RDLED
of communication cassette
is flashing.
(Note) For checking communication parameters with PMGET instruction, the CPU should be set in the RUN mode.
Set "Mode selection when self-diagnostic error occurs - A unit error occurred." to "Continue operation" in the
CPU configuration.
10-4
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Contents to check
Is a communication cassette attached?
Are wirings correct?
Isn't there any problem in environments such as
noise?
Is the unit number of each unit set correctly?
- Are the unit numbers set sequentially and
consecutively from 1?
- Isn't there any overlapping unit number?
- Isn't any number over 17 used for unit number
with PMSET instruction?
Isn't there any overlapping transmission area for
each unit.
Is the transmission/reception area of PLC link
correct?
Is the maximum unit number used for the PLC
link correct?
Is the communication mode set correctly?
Contents to check
Is a communication cassette attached?
Are wirings correct?
Isn't there any problem in environments such as
noise?
Is the communication mode set correctly?
Are communication condition settings correct?
Are unit numbers set correctly?
Is the communication mode set correctly?
Is the communication mode set to the same
mode as that of a destination device?
Is the command length for MEWTOCOL or
MEWTOCOL-7 within the prescribed length?
Confirmation method
Check if the communication cassette
is attached firmly.
Check the wirings again.
Check the shielding.
- Check the configuration (COM.1
settings) of the CPU with built-in SCU
unit or the serial communication unit.
- Check the communication
parameters with PMGET instruction.
(Note)
Confirmation method
Check if the communication cassette
is attached firmly.
Check the wirings again.
Check the shielding.
- Check the configuration (COM.1
settings) of the CPU with built-in SCU
or the serial communication unit.
- Check the communication
parameters with PMGET instruction.
(Note)
Check the programs of destination
devices.
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