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Power consumption TX-I/O: Consumption data DC 24 V per I/O point
(values in mA, for supply sizing)
Power consumption of
PL-Link devices
Power consumption of
DALI devices
Load-dependent cable
lengths
Permissible load [VA]
Notes
Siemens
Building Technologies
Type
Intrinsic consumption
2)
Digital input
(contact closed)
3)
Analog input
(Temp. sensors Ni, PT, T1)
3)
Analog input
(Temperature sensor NTC)
3)
Analog input
(Resistance)
2)
Analog input (10 V)
Digital output (relay active)
Digital output (triac active)
Analog output (10 V)
Unconfigured I/O point
(Reserve for later configuration)
1)
Including module status LED; includes LCD and all override LEDs if applicable
2)
Including I/O status LED
3)
Included in intrinsic consumption (no I/O status LED for temperature inputs)
5)
The triacs have a switch capacity of AC 24 V, 125 / 250 mA (max 500 mA for 90 s).
This power is supplied by the 24 V ~ conductor, not by the DC 24 V power supply.
Typically 5 mA at DC 24 V
However, check each device's data sheet.
In particular, the QMX3 room unit uses max. 12.4 mA.
Typically 2 mA at DC 16 V
The table below provides permissible loads based on cable lengths and cable
cross sections. It is the distance between the transformer and the most distant
supply point.
Cable cross-
section
2
1.50 mm
AWG16
2
2.50 mm
AWG14
Mounting and installation
Wiring for AC 24 V and island bus
1)
25
3.5 2.5
2)
2) 5)
2)
3.5 2.5
Cable length for AC 24 V
2.5 m
5.0 m
200 VA
100 VA
320 VA
160 VA
25
35
20
25
25
3
0
0
1
1
8
12
8
3
3
8
12
8
10 m
20 m
50 VA
25 VA
10 VA
80 VA
40 VA
16 VA
CM111043en_03
10
4
4
50 m
25 / 56
2013-02-23
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