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Siemens  TX-I/O™ Module system – Functions and operation  CM110561en_08 
Building Technologies  Introduction  2018-10-25 
1  Introduction 
1.1  Revision history 
•  Section 2.6, 4.1 Correction for PT100 4-wire 
•  Detail information concerning MO Steps (multistate maintained contact) 
02.2012, Rev. _06  •  New modules with new functions 
•  New signal types designations (for a comparison between signal types of different 
building automation and control systems see N8170) 
•  Described all functions of the TX-I/O modules, even if not supported by all building 
automation and control systems 
07.2010, Rev. _05  •  New: Section 5.3 Maintained contact, bistable 
•  Section 5.1 Correction concerning fault response 
•  As a rule, all information depending on an individual building automation and 
control system was moved to document CM110562 (support of signal types, TX-
I/O functions, resolution, etc.) 
04.2009, Rev. _04  Section 1.5:  Intranet address 
Section 4.1:  Note on open circuit detection with U10 
Added Version 4 functions 
01.2008, Rev. _02  Section 5.1: Note on 4QD-M2 
Section 5.9: Note on synchronization 
 
 
1.2  Key target groups 
 
•  Project managers 
•  Consulting engineers 
•  Service engineers 
•  Control panel manufacturers 
 
 
1.3  Contents and validity of this manual 
 
This manual describes all functions available in conjunction with the TX-I/O modules. 
The description is limited to modules and field devices. 
A specific building automation and control system may not support all functions 
described hereafter. 
Configuration and parameter-setting for each building automation and control system is 
described in the respective online help. 
 
 
1.4  Other applicable documents 
TX-I/O™ Range overview data sheet 
TX-I/O™ Module data sheets 
TX-I/O™ Power supply module / bus connection module data sheet 
P-bus bus Interface module data sheet 
TX-I/O™ Engineering and installation guide 
Replacement of legacy modules 
 
 
 Note!