CTI 2572-B / 2500C-2572-B Installation and Operation Manual 60
10.2. General Troubleshooting Techniques
If you are experiencing problems with using the 2572-B, you should note the general category of the problem
you are encountering:
• The module has not started up properly. If the MS (Module Status) and the NS (Network Status) LEDs are
not S
TEADY GREEN, a problem has been encountered during startup.
• The module is operational, but is not communicating with a client application.
• The module is communicating with a client application but performance is substandard.
• The PLC is unable to initiate a client connection to another CTI Ethernet module or PLC.
10.3. Module Startup Problems
Before the module can communicate with other TCP/IP hosts, it must complete startup operations. If the MS
LED is S
TEADY GREEN and the NS LED is STEADY GREEN, the module has successfully completed startup.
Otherwise, a problem has been encountered during module startup. See the table below to determine that
cause of the problem.
No LEDs are illuminated.
No Power to Module.
Ensure that power is supplied to the rack
and that the module is securely inserted.
Defective Module. Cycle the power. If the problem persists,
contact CTI customer support.
NS LED is OFF
The TCP/IP interface is not
operational.
Cycle the power. If the problem persists,
contact CTI support.
NS LED is FLASHING GREEN The module is waiting on the PLC
logic to successfully start Network
Services.
Ensure that the PLC is in RUN mode.
Examine Offset 0 of the Command Block to
determine whether a command execution
error occurred. If so, use the error code to
determine the nature of the error and
make corrections as needed.
Ensure that the PLC logic is working
NS LED is FLASHING RED The module is waiting on the PLC
logic to successfully start Network
Services. The IP Address obtained
from flash memory during startup
is a duplicate of the IP address of
another IP host on the network.
See corrective actions above.
NOTE: This is a temporary state, since the
PLC will provide the final IP address when
the Start Network Services command is
successfully completed.
NS LED is STEADY RED The module has detected that
another IP host on the network is
using an IP address that is the same
as this module.
Duplicate IP addresses will cause
connection errors, which may inhibit
communications or cause the client
requests to be transmitted to the wrong IP
host. You should either change the IP
address of this module to a non-conflicting
IP address or locate the IP host with a
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