
52/54
Siemens
TX-I/O™ Module system – Functions and operation
CM110561en_08
Building Technologies
Default functions, disabling function
2018-10-25
7
Default functions, disabling function
7.1 Default functions
The default functions are downloaded into the modules before they leave the factory.
They permit reduced operation and convenient "functional testing" in the control panel
before the module parameters have been set.
The various modules have the following default functions:
Modules
Types
Default function
Equivalent function
Digital input modules
TXM1.8D, TXM1.16D
BI Default
BI NO / D20
Universal modules
TXM1.8U, TXM1.8U-ML
UIO Default
Description see next page
Super universal modules
TXM1.8X, TXM1.8X-ML
UIO Default
Description see next page
Resistance measuring
module
TXM1.8P
RI Default
Description see next page
Relay modules
TXM1.6R, TXM1.6R-M,
TXM1.6RL
BO Default
BO Relay NO 250V / Q250
Triac module
TXM1.8T
BO Default
BO Triac NO
Blinds module
RXM1.8RB
MO Default
4 x MO Steps (2-stage) / Q-M2
The default functions (factory-set I/O module status) have been specially designed for
testing without a bus master. With configured modules, each I/O point would react
differently according to the signal type.
The default functions allow you to test the wiring that is connected to the I/O points, as
soon as the DC 24 V supply is switched on (no connection to a bus master is required).
When the module is powered, the module status LED flashes.
When additionally the address key is swiveled in, the default function is available.
7.2 Null function (Null Function)
The disabling function prevents local override of an I/O point. It should be configured to
decommission any unused I/O points.
There are no variables to set as parameters, and no island bus inputs or outputs.
Application
Wiring test
Application