ECx-4XX Series I/O Extension Module Specific Troubleshooting
Network Guide 121
CHAPTER 8
ECx-4XX Series I/O Extension Module
Specific Troubleshooting
For general troubleshooting of an ECx-4XX Series I/O Extension Module, first follow the trou-
bleshooting for a controller - see BACnet Troubleshooting on page 109 and LonWorks Trou-
bleshooting on page 115. Then follow the troubleshooting tips shown below.
Table 37: Troubleshooting ECx-4XX Series I/O Extension Module Device Specific Symptoms
Symptom Possible Cause Solution
Device does not com-
municate on the BAC-
net MS/TP network
Absent or incorrect supply voltage 1. Check power supply voltage between 24VAC/DC ±15% and
24V COM pins and ensure that it is within acceptable limits (for
24V controllers).
3. Check for tripped fuse or circuit breaker.
Cut or broken wire. Isolate the location of the break and pull a new cable.
Overloaded power transformer Verify that the transformer used is powerful enough to supply all
controllers. See ECx-4XX I/O Extension Module Power Supply
Requirements on page 47.
Network not wired properly Double check that the wire connections are correct.
Absent or incorrect network termina-
tion
Check the network termination(s). See 2-Wire Subnetwork Data
Bus Topology and End-of-Line (EOL) Terminations on page 93.
There is another controller with the
same Subnet ID on the subnetwork
data bis
Each I/O Extension Module on the subnetwork data bus must have
a unique Subnet ID. Look at the Subnet ID DIP switch on the face-
plate of each I/O Extension Module. See ECx-4XX I/O Extension
Module Addressing on page 95.
Network length Check that the total wire length does not exceed the specifications
of the Network Guide. See About the Subnetwork Data Bus on
page 70.
Wire type Check that the wire type agrees with the specification shown in 2-
Wire Subnetwork Data Bus Physical Specifications and Cable
Requirements on page 92.
To Next Page
Loading...
Need help?
General
