Mitsubishi Electric L26CPU-BT User Manual page 348

Description
Check item
of problem
A1-5 Cables
A1-6 Link start
Unable to link
the entire
system.
Programmable
A1-7 controller CPU
check
346
Check contents
Is there any disconnection,
short-circuit, incorrect
wiring, faulty connection, or
status out of specifications
(transmission distance,
distance between stations,
transmission cable,
coexistence of different
cables or FG connection)?
Are the terminating
resistors connected?
Is the programmable
controller CPU in the
RESET status? (when
setting the network
parameter)
Does CC-Link startup
automatically?
Does any error occur at the
programmable controller
CPU of the master station?
Is not the sequence scan
too long? (synchronous
mode)
Check procedure
Check if the cable between the
master station and device
station is not disconnected.
Check if the terminating
resistors are connected to the
both ends of the CC-Link
system.
Check if a station with built-in
terminating resistor is
connected other than at both
ends in the CC-Link system.
Check if the RESET switch of
the programmable controller
CPU is not at the RESET
position.
Check if any value is set to the
intelligent function module
switch setting.
Check the error code of the
programmable controller CPU.
Check if the module can be
recognized.
Does the sequence scan time
exceed the tolerance?
10Mbps: 50ms
5Mbps: 50ms
2.5Mbps: 100ms
625kbps: 400ms
156kbps: 800ms
Corrective action
Connect the cable properly.
Connect the terminating
resistors to the both ends
of the CC-Link system.
Set the RESET switch to
the center position.
Disable the intelligent
function module switch
settings in GX Works2.
Correct the error code of
the programmable
controller CPU.
Refer to MELSEC-L CPU
Module User's Manual
(Hardware Design,
Maintenance and
Inspection)
Recognize the L series
master/local module
properly.
Refer to MELSEC-L CPU
Module User's Manual
(Hardware Design,
Maintenance and
Inspection)
Switch to the
asynchronous mode, or
reduce the transmission
speed.