CLINK II SCU MANAGER
troubleshooting guide
version 5.0
61
6.4
Status Network LED
The bi-color (green/red) LED NETWORK A and NETWORK B indicate the status of the communication link.
See table 57 for a description of the LED states.
6.5
Fault messages
The SCU is able to report a number of fault messages which are classified into four fault types (see table 58).
See table 59 for an overview of SCU fault messages.
Solid Red
Major Unrecovera-
ble Fault
The device has experienced a major fault that is believed
to be unrecoverable (see 6.5).
Flashing Red
Major Recoverable
Fault
The device has experienced a major fault that is believed
to be recoverable (see 6.5).
Flashing Red/Green
Device Self Testing
The device is in selftest.
Table 57: States of the Network LEDs
Network A
or B LED is
State
Indication
Off
Not powered/not on-line
SCU is not on-line:
•
the SCU has not completed the Dup_MAC-ID test yet.
•
the SCU may not be powered, look at the status Module
LED.
Flashing
green
On-line, not connected
SCU is on-line but has no connections in the established
state:
•
the SCU has passed the Dup_MAC_ID test, is on-line, but
has no established connections to other nodes
•
the SCU has no established connections.
Solid green
Link OK, on-line, con-
nected
The SCU is on-line and has connections in the established
state.
•
the SCU has one or more established connections.
Flashing Red
Connection time-out
One or more I/O connections are in the timed-out state.
Red
Critical link failure
Failed communication. The SCU has detected an error that
has rendered it incapable of communicating on the network
(duplicated MAC ID or Bus-off).
Flashing
Red/Green
Communication faulted
and received an identify
comm fault request - long
protocol
A specific communication failure. The SCU has detected a
Network access error and is in the communication faulted
state. The SCU has subsequently received and accepted an
Identify Communication Faulted Request - Long Protocol
message.
Table 56: States of the Module LED
LED is
State
Indication
