38
Indicators
Section 5-2
Indicator Status and Meaning
Refer to the DeviceNet (CompoBus/D) Operation Manual (Cat. No. W267) for
details on error processing.
Indicator status
Network status
Probable cause and remedy
MS
NS
ON
(green)
ON
(green)
Remote I/O or message commu-
nications in progress
E5ZE is communicating normally.
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 DeviceNet switch settings.
Check the settings and restart the Slave.
ON
(green)
ON
(red)
Node address duplication
The same Slave Unit node address has been set on another
node. Change the 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 items and restart the Slave Unit.
•
Does the baud rate of the Master and Slave match?
•
Are cable lengths (trunk lines and branch lines) appropriate?
•
Are any cables disconnected or loose?
•
Is terminating resistance applied to both ends of the trunk lines
and nowhere else?
•
Is there excessive noise?
ON
(green)
Flashing
(red)
Communications timeout
The connection with the Master Unit timed out.
A communications time
-
out error has occurred.
Check the following items and restart the Slave Unit.
•
Does the baud rate of the Master and Slave match?
•
Are cable lengths (trunk lines and branch lines) appropriate?
•
Are any cables disconnected or loose?
•
Is terminating resistance applied to both ends of the trunk lines
and nowhere else?
•
Is there excessive noise?