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FX
-16LNK-M MELSEC-I/O LINK REMOTE I/O SYSTEM MASTER BLOCK
2N
5.
Troubleshooting
If a problem has occurred, check the following contents.
Checked position
LEDs on master block
On-line station setting
switch on master block
Station No. of remote
I/O unit
Status
POWER LED is extinguished. 5V DC supplied from PC has come down.
24V DC LED is extinguished. Supply 24 VDC power to "+24" and "-24".
RUN LED is extinguished.
SHORT LED is lit.
OPEN LED is lit.
PARITY LED is lit.
ERROR STATION LED
(0 to F) is lit.
Switch of station No. corre-
sponding to connected
remote I/O unit is set to OFF.
One station No. is assigned
to two or more remote units.
Action
An error has occurred in communication with a
remote I/O unit set by on-line station setting switch.
Check SHORT, OPEN and PARITY LEDs to detect
causes of error.
Check whether DATA and DG are short-circuited.
Check whether signal lines (DATA and DG) are dis-
connected. Check whether power of remote I/O
unit is turned off.
Check ERROR STATION LEDs to detect a station
with a communication error.
Something is wrong with data received from a
remote I/O unit. Noises may be generated.
Check a remote I/O unit corresponding to a lighting
LED.
Set it to ON.
One station No. can be set to only one remote unit.
Troubleshooting 5
5-1
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