CHAPTER 3: MAINTENANCE AND TROUBLESHOOTING
SNAP PAC S-Series User’s Guide
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•
Is the controller in bootloader mode? (If the reset button is held down for too long, the
controller will enter bootloader mode, which is indicated by the STAT LED blinking seven times
quickly.)
If you still cannot ping the controller,
contact Opto 22 Product Support. (See
“For Help” on
page 14
for contact information.)
Solving Network Problems
If there are recurring problems in communicating with the controller, check your network. The wires,
switches, and other parts 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 unit uses the switch’s uplink port.
•
The controller’s LNK LED is lit.
Check Ethernet Errors
Next, use PAC Manager to check any Ethernet errors reported. These errors indicate network
problems. You will need to know the controller’s IP address.
1.
Choose Start
→
Programs
→
Opto 22
→
PAC Project Software
→
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 controllerI/O unit. Click Status Read.
4.
Scroll down until you see the items Ethernet Errors: Late Collisions, Ethernet Errors: Excessive
Collisions, and Ethernet Errors: Others.
