Operating Instructions

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Siemens TX-I/O™ Module system – Functions and operation CM110561en_08
Building Technologies Digital input functions 2018-10-25
N/O contact
N/C contact
Acknowledgement
Process value
I/O status LED
LCD display
closed
open
closed
open
active
inactive
ON
OFF
10761D05
Diagram: Cause and effect
For details, especially in relation to flashing pattern and errors: refer to the section
"Display, operation and diagnostics" the TX-I/O™ Engineering and installation guide [6].
In the event of an interruption in communication with the bus master, it makes no
sense to store old pulses. Therefore, the memory and the acknowledgment are
bypassed and the pulses are displayed directly.
3.3 Status indication, pulse contact (P-Bus-BIM)
(D20S, realized with BI Static)
(Function for island bus: See section 3.2)
Used for the acquisition of status pulses from volt-free pulse contacts and electronic
pulse transmitters such as transistors and optocouplers.
The pulses can be triggered by:
– Mains voltage monitoring systems
– Emergency pushbutton signals, e.g. in elevators
– Start-up monitoring for analysis of faults
• The function requires one I/O point
• The TX-I/O modules support only inputs with N/O contacts.
Response in the
event of a fault
Application
Hardware
Function