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Siemens Industry, Inc.
Building Technologies
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Insert and then remove the reset key.
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Cycle power to the module.
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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).
Modules begin oscillating; island bus communication shuts down
Reset: Switch off the 24 Vac supply of the PXC Modular, PXC-36, or P1 BIM.
Relays and current outputs have a power consumption that depends on the supply
voltage (module supply 24 Vdc). The power consumption of an I/O island will rise when
all relays are active and all current outputs deliver 20 mA. This causes a drop in the
supply voltage.
If too many of these outputs are configured, the voltage may drop too much so that all
modules switch off. When the voltage recovers, the modules switch on again, and so
forth, 1 to 2 times per second.
In this case, the PXC Modular, PXC-36, or P1 BIM reacts by switching off the
communication after 5 cycles (shortcut between CD and CS, the COM LED will light
brightly).
Troubleshooting the LCD Panel Indications
NOTE:
Physical points on an I/O module hold the last configuration until characterized with a
different type--even when the logical point is deleted from the database. Use the reset
key to remove the physical point configuration from all points on an I/O module.
When troubleshooting an I/O module that does not have an LCD panel or manual
override switches, you may wish to temporarily install a TXM1.8X-ML or TXM1.8U-ML
plug-in module. This allows you to quickly review the module status and error
indications. Do the following to temporarily replace the plug-in module:
1. Remove the address key from the I/O module.
2. Remove the plug-in module from its terminal base.
3. Insert the TXM1.8X-ML or TXM1.8U-ML plug-in module.
4. Insert the reset key.
All of the module status LEDs briefly light to indicate the temporary plug-in
module has been reset.
5. Remove the reset key and reinsert the address key.
6. Troubleshoot using the LCD panel indications.
7. When done, remove the TXM1.8X-ML or TXM1.8U-ML plug-in module.
8. Reinsert the original plug-in module and its address key.
Technical Reference Manual
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Troubleshooting the TX-I/O Island Bus
95 | 100
145-172
2018-09-25
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