Omron EJ1 - 07-2008, Operation Manual

Page: 157 / 198

138
Indicators and Error Processing Section 8-1
8-1 Indicators and Error Processing
The following table lists the indicator status when errors occur, the probable
causes and processing.
Indicator status Probable cause Remedy
MS: OFF
NS: OFF
The power is not being
supplied to the Unit. Supply communications power from
the DeviceNet Communications con-
nector.
The power voltage is
not within the permitted
range. Use a power supply voltage within the
permitted range.
The Unit is faulty. Replace the Unit.
MS: Flashing green
NS: No change
The Temperature Con-
troller connection con-
figuration is not
registered. If I/O allocations are to be set using
the Configurator, register the Temper-
ature Controller connection configura-
tion. (Refer to pages 45 to 68).
MS: Flashing red
NS: No change
A sum error has
occurred in the parame-
ters registered in
EEPROM. Use the Configurator’s device monitor
to check the parameters with the sum
error or logic error, and reset the
parameters.
A EEPROM hardware
error has occurred. Replace the Unit.
MS: ON red
NS: OFF
The Unit is faulty Replace the Unit.
MS: ON green
NS: Flashing green
Waiting to connect to
DeviceNet communica-
tions. Check the following items and restart
the Unit.
• Are lengths of cables (trunk and
branch lines) correct?
• Are cables short-circuited, broken,
or loose?
• Are cables wired correctly?
• Is terminating resistance connected
to both ends of the trunk line only?
• Is noise interference excessive?
• Is the power to the master ON?
The Unit is faulty. Replace the Unit.
MS: ON green
NS: ON red
The DeviceNet is in Bus
Off status. Check the following items and restart
the Unit.
• Are lengths of cables (trunk and
branch lines) correct?
• Are cables short-circuited, broken,
or loose?
• Is terminating resistance connected
to both ends of the trunk line only?
• Is noise interference excessive?
Node addresses dupli-
cated. Reset node addresses correctly.
The Unit is faulty. Replace the Unit.
MS: ON green
NS: Flashing red
A communications tim-
eout has occurred. Check the following items and restart
the Unit.
• Are lengths of cables (trunk and
branch lines) correct?
• Are cables short-circuited, broken,
or loose?
• Is terminating resistance connected
to both ends of the trunk line only?
• Is noise interference excessive?
The Unit is faulty. Replace the Unit.