BACnet Troubleshooting
Network Guide
111
The STATUS LED is
blinking
The device has auto-
diagnosed a fault con-
dition
See
for a list of fault codes.
Controller communi-
cates well over a short
network, but does not
communicate on large
network
Network length
Check that the total wire length does not exceed the specifications of the Network
Guide. See
Data Bus Physical Specifications and Cable Requirements
on page
Wire type
Check that the wire type agrees with the specification of the Network Guide: See
Data Bus Physical Specifications and Cable Requirements
on page 151.
Network wiring prob-
lem
Double check that the wire connections are correct.
Absent or incorrect
network termination
Check the network termination(s). Incorrect or broken termination(s) will make the
communication integrity dependent upon a controller's position on the network.
Number of controllers
on network segment
exceeded
The number of controllers on a channel should never exceed 50. Use a router or
a repeater: See
Data Bus Segment MAC Address Range for BACnet MS/TP
on page 148.
Max Master parameter
Configure the maximum number of master device on the MS/TP network in all
devices to the controller's highest MAC address used on the MS/TP trunk.
net MS/TP Data Bus Token-Passing Overview
Hardware input is not
reading the correct
value
Input wiring problem
Check that the wiring is correct according to the module's hardware installation
manual and according to the peripheral device's manufacturer recommendations.
Open circuit or short
circuit
Using a voltmeter, check the voltage on the input terminal. For example, for a dig-
ital input, a short circuit shows approximately 0V and an open circuit shows
approximately 5V. Correct wiring if at fault.
Configuration problem
Using the controller configuration wizard, check the configuration of the input.
Refer to the controller's user guide for more information.
Over-voltage or over-
current at an input
An over-voltage or over-current at one input can affect the reading of other inputs.
Respect the allowed voltage / current range limits of all inputs. Consult the appro-
priate datasheet for controller input range limits.
Hardware output is not
operating correctly
Fuse has blown (Auto
reset fuse, for 24V
controllers)
Disconnect the power and outputs terminals. Then wait a few seconds to allow
the auto-reset fuse to cool down. Check the power supply and the output wiring.
Reconnect the power.
Output wiring problem
Check that the wiring is correct according to the module's hardware installation
manual and according to the peripheral device's manufacturer.
Configuration problem
With EC-
gfx
Program, check the configuration of the output; for example, is it
enabled? Refer to the EC-
gfx
Program User Guide for more information.
0-10V output, 24VAC
powered actuator is
not moving
Check the polarity of the 24VAC power supply connected to the actuator while
connected to the controller. Reverse the 24VAC wire if necessary.
Table 27: Troubleshooting ECB Device Symptoms
Symptom
Possible Cause
Solution
Содержание ECB-VAV
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