Installation manual
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Points to Remember
Pressing the reset button on the scanner does not reset the network •
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Cycling the rack power does not reset the network
When using a DeviceLink a bus off (solid RED) condition can only be cleared by
cycling the 24V power
Cycling power on the network will cause the scanner to go bus off
DeviceNet 9000 bus off (solid RED) condition can be cleared by cycling the 24V
power or by pressing the program button for several seconds
Extreme care must be given to the task of setting initial addresses and baud rates
because one incorrect node address or incorrect baud rate will cause other nodes
to appear to be bad (solid RED).
If the scanner is bus off (code 91), nodes will not re-allocate (flashing GREEN or
RED) even if they are functioning correctly
RSNetworx for DeviceNet and a 1770-KFD/1784-PCD can be used to identify the
functioning nodes on the network.
If a node goes bus off (solid RED for DeviceLink), and is replaced and still goes
bus off, the problem is not the node but rather the setting of the address or baud
rate or a network wide problem related to topology, grounding, electrical noise or
an intermittent node
MORE TROUBLESHOOTING TIPS
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Try to distinguish, as soon as possible, a device problem from a media problem.
Try to reduce the system to the smallest size, which still exhibits the problem. This can be
done by removing nodes, drops, taps, or lengths of trunk can do this.
Use substitution where possible to rule things out, but be careful!
Actual Field Case:
Product A works with Product B and not with Product C.
We conclude that the problem is with Product C -- WRONG!!
The problem was with product A., Product C was operating correctly, But just happened to be
Susceptible to the fault in the product A.
Always remember do not
assume too much!
If you suspect a media problem, inspection is always a good first step.
Verify lengths, topology, and proper termination ( VERY IMPORTANT ).
Always. Always, ALWAYS!!........... Check all Connections.
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