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Siemens
TX-I/O™ Module system – Functions and operation
CM110561en_08
Building Technologies
Digital output functions
2018-10-25
5.11 Blinds control
(BO Blinds Relay)
Control any kind of blinds.
– Without louvers
– With louvers
The function uses
– 2 I/O points for actuators with 2 end switches
– 3 I/O points for actuators with 3 end switches
the fourth I/O point must remain unused
The function generates switching pulses for the 2 or 3 relays from the structured
process value AOBValue.
The blinds control function is shared between module and bus master (application
function). The application function in particular is responsible for the louver angle. For
this reason, the process value is sent in both directions: to the periphery as a
command, and to the bus master as a status signal.
I/O
processing
LED
AOBValue
UP
I/O
processing
DOWN2
DOWN1
Current
measurement
I/O
processing
Current
measurement
Channel selection,
current supervision,
pulse generation,
processing (timing)
depends on
configuration (2 or 3
limit switches)
Relay outputs
Output
Command
Description
Actuators with 2 end
switches
n
DOWN2 RUN_DOWN DOWN (to position "0%")
n + 1
UP
RUN_UP
UP (to position "100%")
Actuators with 3 end
switches
n
DOWN2 RUN_DOWN DOWN (to position "0%")
n + 1
UP
RUN_UP
UP (to position "100%")
n + 2
DOWN1
DOWN to middle position (end switch
between position 0 and 100%)
n + 3
--
Output n+3 must remain free
Application
Hardware
Function