Ethernet Units Operation Manual

204
Troubleshooting Procedures Section 10-5
True ➨ Replace the following items in order to remove the faulty part:
Power supply cable, Power Supply Unit, Ethernet Unit.
5. Connect a 24-VDC power supply.
6. Is the power supply indicator lit on the transceiver?
True ➨ Step 9.
7. Is the transceiver cable loose?
True ➨ Connect the cable firmly.
8. Replace the following components one at a time in the order given and dis-
card any faulty ones: transceiver cable, transceiver, Ethernet Unit.
9. Execute ping at each node for all nodes on the network to see if commu-
nications are possible.
10. Was not even one response received at every node in the network?
True ➨ Check terminators, the coaxial cable, and transceiver cables.
11. Were responses not received only between certain nodes?
True ➨ Make sure the distance between transceivers on the coaxial cable
is a multiple of 2.5 m.
Check IP address settings.
Make sure that the remote node supports ICMP.
12. Is an FTP client not mounted on the remote node?
True ➨ Mount an FTP client.
13. Are you using FINS communications (e.g., SEND(090), RECV(098), or
CMND(490))?
True ➨ Do an internode test.
14. Read protocol status using the FINS command READ PROTOCOL STA-
TUS and check the following parameters in the returned status data. If any
of these items have actually been counted, the remote node may not sup-
port the relevant service.
IP (all communications): Items 2 through 6
ICMP (PING): Items 5 through 8
TCP (FTP and TCP sockets): Items 4 through 6 under reception status
UDP (FINS and UDP sockets): Items 1 through 3
If item 4, 8, or 9 under the IP status is being counted, there may be too
much traffic through the Ethernet Unit. Check your user applications.