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Siemens
TX-I/O™ Module system – Functions and operation
CM110561en_08
Building Technologies
Digital input functions
2018-10-25
3.4 Pushbutton input
(BI Push NO, BI Push NC)
Acquire potential-free
button pulses
(simple button/dual button).
The process values (event telegrams) are evaluated in the bus master and help to
control:
– Blinds
– Lighting applications
– Other applications controlled by pulses
•
The function uses one or two I/O points (simple/dual button).
In case of a dual button, both I/O points must be located next to each other on the
same module pattern.
•
Only modules from series D support this function.
Signal Processing
(PBI Event)
Process values
(Events)
I/O status LED
NO Contact (UP)
BUS
10
56
1z
15
7
NO Contact (DOWN)
Function diagram
•
The signals are read and debounced on hardware level
•
The pulses are interpreted and converted to corresponding events.
The function then sends events at the start, the end, and partially during the pulse
(standard pulse patterns are:
– Short pulse
– Long pulse
– Short double-click
– Short/long double-click
– Long double-click
– Dual click (simultaneous clicking of two buttons)
•
The events are sent immediately on the island bus
•
A new event prior to sending overwrites a previous event.
Exceptions:
– Repeat does not overwrite start
– Heartbeat (due to COVperiod) does not overwrite upcoming events
•
The signal operation can be selected: Contact_NO (default), Contact_NC)
Application
Hardware
Function