NAiS FP2, Technical Manual

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5-18
5.6 Troubleshooting ( PC(PLC) Link)
Status indicator LEDs
Indication Function
Light (on): when PC(PLC) link error occurs
ERR Red Communication error
Off: when PC(PLC) link is established
Light (on): when setting error occurs
S. ERR Red Setting error
Off: Normal
Note) When the ERR LED lights out and the SD/RD-LED is flashing, the PC link is operating properly.
Troubleshooting
Trouble Contents to check How to confirm
Transmission error
Link stops
(ERR LED lights) - Is a communication block
installed?
- Is the wiring correct?
- Isn’t there any problem in
environments such as noise? Check the special relays R9050
to R9054 (transmission error
flag).
Unit no. overlaps
(ERR LED lights) - Check unit Nos. for each unit.
- Is the unit no. setting correct?
(Are the unit Nos. set sequentially
and consecutively from 1? Isn’t
there any overlapping unit no?
Isn’t any number over 16 used for
unti no?) Check the special regsiters
DT90161, DT90163 and
DT90165 (error content).
PC link area overlaps
(ERR LED lights) - Check if there are overlapping
send areas of each unit.
- Is the setting of the send/receive
areas of PC link correct? (Isn’t it
set to send redundantly?) Check the special registers
DT90170, DT90200 and
DT90230.
PC link error
(ERR LED lights) - Is a communication block
installed?
- Is the wiring correct?
- Isn’t there any problem in
environments such as noise? Check the special registers
DT90160 to DT90247.
Disagreement of max. unit no.
(ERR LED lights) - Check if the same value is set
for system register no. 47 (or no.
57) for each unit.
- Is the maximum unit no. correct?
(Is the same unit no. specified for
all connected MCUs? Isn’t any no.
over the maximum unit no. used?) C]heck the system register.
S.ERR-LED is on. - Is the operation mode setting
correct?
- Isn’t it used excessively ignoring
the usage restrictions? Read out setting contents using
F161 (MRCV) instruction and
check the contents.
ALARM lights Hardware error Please contact your dealer.
Note) The stutus can be monitored using the PC(PLC) link monitor of the MCU setting in abnormal
conditions.