Operating Instructions

Chapter 4—Troubleshooting
Troubleshooting the TX-I/O Island Bus
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Siemens Industry, Inc.
Owner's Manual
588-781
Building Technologies
2018-10-01
Troubleshooting the TX-I/O Island Bus
All points on the TX-I/O island bus are failed.
1. Verify all three signals, System Neutral ( ), Communication Data (CD), and
Communication Supply (CS) are connected throughout the entire TX-I/O island
bus.
The 24 Vac LED on the TX-I/O Power Supply is OFF.
1. Check for 24 Vac input.
2. Replace the fuse (4A, 5 × 20 mm, 250V, medium-acting, ceramic fuse).
The I/O module status LED (under the address key) is flashing or the I/O
point status LED is flashing on an open point. All points are operating
normally.
CAUTION
The TX-I/O™ island bus must extend from the male bus connector of the TX-I/O
Power Supply or Bus Connection Module.
• The TX-I/O Power Supply and Bus Connection Module only supply 24 Vac to I/O
modules on the male bus connector.
• I/O modules on the female bus connector of the TX-I/O Power Supply or Bus
Connection Module do not receive power and have a fault condition.
A point is failed or the point type displayed does not correspond to the
point type defined in the database.
1. Using the job drawing or TX-I/O Island Bus layout sheet, verify that the address
keys are in the correct module.
2. Reset the module to factory settings.
– Verify that the module is supplied with 24 Vdc.
– Remove keys that are in the wrong module.
– Insert and then remove the reset key.
– Cycle power to the module.
– Insert the correct address key.
A current point on a Super Universal Module is failed.
 Verify that the sensor supply wire is connected to the DC terminal (3, 11, 20, or
28).