Troubleshooting
10-4
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
Contents to check
Confirmation method
Is a communication cassette attached?
Check if the communication cassette
is attached firmly.
Are wirings correct?
Check the wirings again.
Isn't there any problem in environments such as
noise?
Check the shielding.
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?
Communication is not
possible.
(For the serial
communication unit, the
ERROR LED turns on.)
Is the communication mode set correctly?
- 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)
(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
Contents to check
Confirmation method
Is a communication cassette attached?
Check if the communication cassette
is attached firmly.
Are wirings correct?
Check the wirings again.
Isn't there any problem in environments such as
noise?
Check the shielding.
Communication is not
possible.
(For the serial
communication unit, the
ERROR LED turns on.)
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?
- 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)
Communication is not
possible when SD/RDLED
of communication cassette
is flashing.
Is the command length for MEWTOCOL or
MEWTOCOL-7 within the prescribed length?
Check the programs of destination
devices.
(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.
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Summary of Contents for AFP7CCM1
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Page 45: ...3 I O Allocation Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
Page 57: ...6 PLC Link Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
