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Error Indicators
Section 8-1
8-1
Error Indicators
MC Unit Indicators
The following errors are displayed at the LED indicators at the top of the MC
Unit’s front panel.
■
General Indicators
■
DeviceNet Indicators (MCW151-DRT-E only)
The following table lists probable causes and remedies for errors that occur in
the Slave Unit.
RUN
STS
SD
RD
MCW151
MCW151-DRT
RUN
M S
STS
NS
MCW151-E
MCW151-DRT-E
RUN
STS
Error
Remedy
ON
---
(Normal)
---
OFF
OFF
The MC Unit is defective.
Replace the MC Unit.
---
Flashing
A motion error has occurred.
The Servo Driver has been
disabled.
Check what caused the
error, correct the problem
and restart application.
Flashing
Flashing
An error occurred in the com-
munication with the Servo
Driver.
Check what caused the
error, correct the problem
and cycle the power.
Display/Indicator
status
Network status
Probable cause and remedy
MS
NS
ON
(green)
ON
(green)
Remote I/O or message communi-
cation in progress (normal status)
Remote I/O communications and/or message communications
are active on the Network.
ON
(green)
OFF
Checking for node address dupli-
cation
Checking whether the Unit’s node address has been set on
another node.
ON
(green)
Flashing
(green)
Waiting for connection
The Unit is waiting for a connection from the Master Unit.
ON (red) OFF
Watchdog timer error
A watchdog timer error occurred in the Unit. Replace the Unit.
Flashing
(red)
OFF
Incorrect switch settings
A mistake has been made in the switch settings. Check the
settings and restart the Slave.
ON
(green)
ON (red) Node address duplication
The Slave Unit’s node address has been set on another node.
Change settings to eliminate the duplication and restart the
Slave.
ON
(green)
ON (red) Bus Off error detected
The communications controller detected a Bus Off status and
communications have been stopped.
Check the following and restart the Slave: Master/Slave baud
rates, for loose or broken cables, for noise, cable lengths, and
Terminating Resistors.
ON
(green)
Flashing
(red)
Communications timeout
The connection with the Master Unit timed out.
Check the following and restart the Slave: Master/Slave baud
rates, for loose or broken cables, for noise, cable lengths, and
Terminating Resistors.