OPTO 22 SNAP-PAC-EB1, Руководство пользователя

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CHAPTER 4: MAINTENANCE AND TROUBLESHOOTING
SNAP PAC Brains User’s Guide 29
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If information does not appear, contact Product Support. (See page 4 .)
Solving Network Problems
If there are recurring problems in communicating with the brain, check your network. The cables,
routers, 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 Ethernet network switch has power. Switch LEDs indicate that the connection is up. If SNAP
PAC brains are daisy-chained, LNK LEDs for both of their Ethernet interfaces are lit.
• Neither the PC nor the brain uses the switch’s uplink port.
• The two switched network interfaces on the brain are being used correctly and are not creating
a loop anywhere in the network (see
“Using SNAP PAC Brain Network Interfaces” on page 15 ).
• The brain’s LNK LED(s) are lit.
Check Ethernet Errors —Next, use PAC Manager to check Ethernet errors reported by the brain.
These errors indicate network problems. You will need to know the brain’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 brain. Click Status Read.
4. Scroll down until you see the items Ethernet Errors: Late Collisions, Ethernet Errors: Excessive
Collisions, and Ethernet Errors: Others.
Date and
time data
was last
read
Click to
update
data