29
Troubleshooting Section
Error / Trouble
Condition
Possible Cause Solution
Controller does not
come online
Two or more controllers have the same
MAC address.
Modify each duplicate address to a
unique number.
The MS/TP network has too many
devices.
Do not exceed the maximum number of
devices and maximum length allowed
by the EIA-485 specifications.
Too many devices were installed
without any repeaters.
Repeaters need to be installed as
specified in this document.
The MS/TP cable runs are broken Locate the break and correct wiring
MS/TP connections at the module
were reversed
Respect polarity of the wires on a
MS/TP network.
The controller does not have power Apply power to the controller
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