User Manual
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Siemens TX-I/O Engineering and installation guide CM110562en_13
Building Technologies Principles of electrical design 2019-05-15
10.7 Cables for field devices
See below, Sections 10.11 ff.
10.8 Consumption data DC 24 V
Consumption data for the following devices is required as an aid to transformer and
supply sizing and to estimate the heat emitted in the control panel:
– Transformers (intrinsic consumption)
– Automation stations
– Other controllers
– Bus interface modules
– Power supply modules (intrinsic consumption)
– All individual I/O points
– Field devices (connected to the module supply or to separate transformers)
Consumption data DC 24 V per I/O point
(values in mA, for supply sizing)
Type
TXM1.8D
TXM1.16D
TXM1.8U
TXM1.8U
-ML
TXM1.8X *)
TXM1.8X
-ML *)
TXM1.8P
TXM1.6R
TXM1.6R
-M
TXM1.6RL
TXM1.8RB
TXM1.8T
TXA1
-IBE
TXI1.OPEN
Intrinsic consumption
1)
25
25
35
60
30
35
35
20
30
25
25
10
50
55
Digital input
2)
(contact closed)
3.5
2.5
3
3
2
2
Analog input
3)
(Temp. sensors Ni, PT, Pt100_4, T1)
0 0 0 0 0
Analog input
3)
(Temperature sensor NTC)
0 0 0 0
Analog input
3)
Resistance, TXM1.8P also Pt100_4)
1 1 0.5 0.5 1
Analog input (10 V)
2)
1
1
0.5
0.5
Analog input (20 mA)
2)
Supply external or AC 24 V
0.5 0.5
Analog input (20 mA) 2-wire
2)
20
20
Analog input (20 mA) 3-wire
2) 4)
25
25
Digital output (relay active)
2)
8
8
12
8
Digital output (triac active)
2) 5)
4
Analog output (10 V)
2)
3
3
2.5
2.5
Analog output (20 mA)
2)
18
18
Unconfigured I/O point
(Reserve for later configuration)
3.5 2.5 3 3 25 25 1 8 8 12 8 4
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)
4)
The table assumes 5 mA to supply the current sensor, which should be sufficient for
most models. If in doubt, lease refer to the sensor data sheet.
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.
Consumption, general