Mitsubishi L26CPU-BT, User Manual

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15 TROUBLESHOOTING
Description of problem Check item Check contents Check procedure Corrective action
Check the error code of the
programmable controller CPU.
Correct the error code of the
programmable controller CPU.
Refer to MELSEC-L CPU Module
User's Manual (Hardware Design,
Maintenance and Inspection)
Does any error occur at the
programmable controller CPU of
the master station?
Check if the module can be
recognized.
Recognize the L series
master/local module properly.
Refer to MELSEC-L CPU Module
User's Manual (Hardware Design,
Maintenance and Inspection)
A1-7
Programmable
controller CPU check
Is not the sequence scan too
long? (synchronous mode)
Does the sequence scan time
exceed the tolerance?
10 Mbps : 50 ms
5 Mbps : 50 ms
2.5 Mbps: 100 ms
625 kbps: 400 ms
156 kbps: 800 ms Switch to the asynchronous
mode, or reduce the transmission
speed.
Check if the transmission cable
and power wiring are separated
enough.
Wire the transmission cable and
power wiring as separated as
possible. (recommended to keep
a distance of more than 100mm)
Check if the FG is separated from
the power system GND. Set FG and the power system
GND apart.
A1-8 Noise
Is there any noise on the
transmission cable?
Reduce the transmission speed
and then check the occurrence
frequency. Execute the protection against
noise.
Reduce the transmission speed.
Unable to link the
entire system.
A1-9 Master station failure Is the master station failed?
Check if the system operates
properly after replacing the
master station.
Fix or replace the master station.
A2-1 Station No.
Is the station number setting at
the faulty station correct? Check the station number setting
at the corresponding station.
Set the station number properly.
A2-2 Transmission speed
Is the transmission speed at the
faulty station correct?
Check the setting of the
transmission speed at the
corresponding station.
Correct the transmission speed.
A2-3
Online status (slave
station) Is the CC-Link interface at the
faulty station in the online status? Check the status of the faulty
station.
Set the online status.
Check the contents of the
network parameters for the
programmable controller CPU of
the master station.
•
Are the network parameters
(such as unit number or
station information) correct?
•
Is some error occurring at the
master station?
•
Network parameter of the GX
Works2
Check SW0068, SW0069,
SW0070, SW0071, SW0072,
SW0074 to SW0077, SW0098 to
SW009B, SW009C to SW009F
and SW0144 to SW0147.
Set the network parameter
properly.
Execute the memory format of
the programmable controller CPU
and then write the network
parameter.
Some station(s)
cannot be linked.
A2-4 Parameter setting
Is the setting correct? (Automatic
CC-Link startup)
Check if any value is set to the
intelligent function module switch
setting. Disable the intelligent function
module switch settings in GX
Works2.
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