TROUBLESHOOTING THE SNAP PAC R-SERIES CONTROLLER
SNAP PAC R-Series Controller User’s Guide
72
Solving Network Problems
If there are recurring problems in communicating with the controller, check your network.
The wires, switches, and so on in your Ethernet network are not part of the Opto 22
hardware, but any problems in your network may affect communication with Opto 22
products.
Create a Network Diagram.
—First, create a network diagram and verify the following:
•
Cable connectors are firmly inserted.
•
The switch has power. Switch LEDs indicate that the connection is up.
•
Neither the PC nor the controller uses the switch’s uplink port.
•
The SNAP PAC R-series controller’s LNK LED is lit.
Check Ethernet Errors.
—Next, use PAC Manager to check Ethernet errors reported by
the controller. These errors indicate network problems. You will need to know the
controller’s IP address.
1.
Choose Start
>
Programs
>
Opto 22
>
PAC Project
>
PAC Manager.
2.
In the PAC Manager main window, click the Inspect icon
.
3.
In the IP Address field, type the IP address of the controller. Click Status Read.
4.
Scroll down until you see the items Ethernet Errors: Late Collisions, Ethernet Errors:
Excessive Collisions, and Ethernet Errors: Others.
Ethernet Errors
