LX Series Free Programmable LX-PRGxxx-11 Controllers Installation Instructions14
Controller
communicates 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 Junction Box and Wiring Guideline for Twisted Pair L
ONWORKS
Networks.
Wire Type Check that the wire type agrees with the specification of the Junction
Box and Wiring Guideline for Twisted Pair LONWORKS Networks.
Network Wiring Problem Check that the wire connections are correct.
Absent or Incorrect
Network Termination
Check the terminations. Incorrect or broken terminations make the
communication integrity dependent upon a controller's position on
the network.
Extra Capacitance Ensure no extra capacitance is connected to the network other than
the standard FTT circuit, and a maximum of a 3 meter stub (in bus
topology).
Number of Devices on
Network Segment
Exceeded
The number of controllers on a channel should never exceed 64.
Use a router or a repeater in accordance with Junction Box and
Wiring Guideline for Twisted Pair L
ONWORKS Networks.
Network Traffic Query node statistic to check errors.
Use a
LONWORKS protocol analyzer to check network traffic.
I/O Extension Module
cannot communicate
on the subnetwork.
Absent or Incorrect
Supply Voltage
1. Check power supply voltage between 24 VAC +
15% and COM
pins and ensure it is within acceptable limits.
2. Check for tripped fuse or circuit breaker.
Overloaded Power
Transformer
Verify the transformer is powerful enough to supply all controllers.
Network Not Wired
Properly
Check that the wire connections are correct.
Absent or Incorrect
Network Termination
Check the network terminations. Only the last
LX-IOE4x0 must
have the EOL termination set to ON. When one or more
LN-SVSENx-0 sensors are connected to the controller, only the last
LN-SVSENx-0 sensor must have its EOL termination set to ON.
Refer to the
LX Series I/O Extension Modules Installation
Instructions (LIT-12011858).
Another Controller with
the Same Subnet ID on
the Subnetwork
Each I/O Extension Module on the subnetwork must have a unique
Subnet ID. Look at the Subnet ID DIP switch on the faceplate of
each I/O Extension Module.
Hardware input is not
reading the correct
value.
Input Wiring Problem Check that the wiring is correct according to this manual and
according to the peripheral device's manufacturer.
Open Circuit or Short
Circuit
Using a voltmeter, check the voltage on the input terminal. A short
circuit has a 0 V value and an open circuit has a 5 V value.
Configuration Problem Check the configuration of the input using the controller
configuration LX GPI Wizard. Refer to the online help 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. Observe the allowed voltage/current range limits for all
inputs.
Table 5: Troubleshooting (Part 2 of 3)
Problem Possible Cause Solution
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