CTI 2572-B - Communications Problems

CTI 2572-B / 2500C-2572-B Installation and Operation Manual 62
10.4. Communications Problems
If the module operational (properly started up) but it will not respond to network clients, refer to the table
below for help in diagnosing the cause.
Symptom
Probable Cause
Corrective Action
The Link Status (LS) LED is
Off
The cable between the module and
Ethernet switch (or other directly
attached device) is not connected.
Ensure that the cable is securely
plugged in to the module and the
Ethernet switch.
The Ethernet cable is defective Substitute a cable known to be
good.
The Ethernet interface of the switch or
other directly attached device is not
operational.
Ensure power is applied to the
switch or device.
The Link Status (LS) LED is
on. But the Ethernet
Activity (ACT) LED does not
flash.
There is no traffic on the network
segment. If you are attempting to access
the module via the network, you should
observe the Ethernet ACT LED flash
intermittently.
NOTE: On most active networks, you will
see some traffic on the local segment,
even though that traffic is not directed to
the module.
Ensure that the module is
connected to the network.
Using a PC attached to the local
network, send a PING to the
module IP address. If you observe
the Ethernet ACT LED flash, the
physical connection is OK.
Attempt to PING the
module using a PC attached
to the local network is
unsuccessful. Physical
network connections are
OK.
You have entered the wrong IP address in
the PING command.
Ensure that the IP address used
with the PING matches the IP
address displayed on the module
MSD.
The IP Address/Subnet Mask of the client
PC is not on the same IP subnet as the
module. See APPENDIX C. IP ADDRESS
INFORMATION for more information.
Determine the IP address and
subnet mask the PC by typing
IPCONFIG in the Command Prompt
window. Compare with the IP
address and network mask (in CIDR
format) displayed on the module
Multi-Segment Display (MSD).
Module IP address/subnet
mask parameters are
improperly set (using PLC
Start option).
Incorrect data has been entered in the
Start Network Services command block.
Review the command block
entries. Ensure that the conversion
to hexadecimal is correct. Correct
entry and reset the module.
Module IP address/subnet
mask is improperly set
(Using AutoStart startup
option).
Incorrect data is stored in FLASH. Use the module web browser to
set the IP address and/or subnet
mask to the correct values.