
2.INDICATION OF LED MAINTENANCE B-63753EN/01
- 52 -
2 INDICATION OF LED
See the Section 10.7 of the specification material for the Single LED
"EN" and "ALM" of HMOP.
The following seven LEDs are mounted on Interface unit, and the
condition of the unit is indicated. As for the mounting position, see
the Section 5.2 of the specification material.
Name Lighting color Description
LI Green
It is turned on with the master of I/O Link during
the communication.
LD Green
It is turned on with the Handy machine
operator’s panel during the communication.
PO Green It is turned on during power supply on.
MS Red
E0 Red
E1 Red
E2 Red
It is turned on by the error occurrence. See the
next table for the details.
The details of LEDs turned on by the error occurrence
MS E0 E1 E2 Error’s name Description Countermeasure
Lit Lit Off Off
Peripheral error of
Interface unit
Interface unit is wrong. Replace Interface unit.
Lit Off Lit Off
RAM parity error of
Interface unit
Interface unit is wrong. Replace Interface unit.
LitOffOffLit
Receiving error of I/O
Link
The other equipment
connected with I/O Link is
wrong.
Confirm the other
equipment connected with
I/O Link.
Lit Lit Off Lit
Framing error of I/O
Link
The communication end signal
of I/O Link is incorrect.
Lit Off Lit Lit CRC error of I/O Link
The communication data of I/O
Link is incorrect.
Lit Lit Lit Lit
Watch-dog error of
Interface unit
Communication from the
master of I/O Link was
interrupted.
The master is wrong, or the
master’s power is turned
off.
Off Lit Off Off
Peripheral error of
HMOP
HMOP is wrong. Replace HMOP.
Off Lit Lit Lit
Watch-dog error of
HMOP
Communication with Interface
unit was interrupted.
The above errors have the possibility that it occurs by the contact
defect of the cable, the breakage or the manufacture defect, too. And,
the errors have the possibility that they occur by the noise, too. In this
case, confirm the connection of the cable, the treatment of shielding
and grounding according to the connection material. And, see the
"Countermeasures against noise" of the manual of NC, too.