Mitsubishi Electric MELSEC QS Series User Manual page 132

9
TROUBLESHOOTING
Description of problem
Doesn't the sequence
scan time exceed the
allowable value for each
transmission speed?
156kbps: 800ms
625kbps: 400ms
2.5Mbps: 100ms
5Mbps : 50ms
10Mbps : 50ms
Is the mode set for the
safety master module
"Safety remote network-
Ver.1 mode"?
Unable to perform data
link for the entire system
Aren't there more than
one safety master module
on the same CC-Link
network?
Has any error occurred on
the safety master
module?
9
- 2 9.1 Checking the Condition by Each Problem
Check item Check procedure
Check special register
SD526 (Maximum scan
time).
Check the mode setting in
network parameters.
Check if the safety master
modules on the same
base are connected via
CC-Link or not.
Reset the safety CPU
module, or turn the power
OFF and then ON, and
then check if the "ERR."
LED on the safety master
module flashes.
Select the safety master
module on the system
monitor, and check the
error code.
Check if the "ERR." LED
on the safety master
module is ON or flashing.
Check result
Modify the sequence
The maximum scan time
program to shorten the
exceeds the allowable
scan time, or reduce the
value.
transmission speed.
The maximum scan time
is the allowable value or Check other items.
less.
Change the mode setting
The set mode is not
for the safety master
"Safety remote network-
module to "Safety remote
Ver.1 mode".
network-Ver.1 mode".
The mode is set to "Safety
remote network-Ver.1 Check other items.
mode".
Connected Correct the connection.
Not connected Check other items.
"ERR." LED on the safety Take measures referring
master module is ON or to Section 9.2 and 9.3
flashing. Check with LEDs.
Check other items. If all
the check results are
normal, a hardware fault
"ERR." LED on the safety
of the safety master
master module is OFF.
module may be probable.
Contact your local
Mitsubishi representative.
An error code is Take measures referring
displayed. to Section 9.5.
"No Error" is displayed. Check other items.
"ERR" LED on the safety Take measures referring
master module is ON or to Section 9.2 and 9.3
flashing. Check with LEDs.
"ERR" LED on the safety
Check other items.
master module is OFF.
Corrective action