Analog Input Functions; Measurement - Siemens TX-I/O TXM1.8D Functions And Operation

Application
Configurable signal types
Description Signal type
TRA
Resistance &
AI Pt1000
2), 8)
temperature
AI Pt100
AI 2500 Ohm
AI 250 Ohm
Temperature AI Ni1000
AI Ni1000
extended
AI PT1K375
(USA)
AI PT1K385
(Europe)
AI Pt100 4 wire
2), 8)
AI NTC10K
AI NTC100K
AI T1 (PTC)
Voltage AI 0-10V
Current AI 4-20 mA
AI 0-20 mA
1) (180) (600) (150) and NTC only with reduced hum injection, see [6]
2) The signal types AI Pt100, AI Pt100 4 wire and AI 250 Ohm run on the TXM1.8P module only, which has no LCD
display.
In the case of direct island bus integration, AI Pt100 4 wire and AI Pt100 are connected with 4 wires, AI 250 Ohm
with 2 wires.
In the case of P-bus BIM integration (V4), AI Pt100 (P100) is connected with 4 wires, AI 250 Ohm (R250) with 2 wires
and jumpers to 4 terminals (as PTM-I/O); connection diagram see data sheet N8176.
The resolution with island bus is significantly better than with P-bus BIM.
4) The "unreliable (general)" error message is displayed:
– when AC 24 V (terminal V
– when DC 24 V (terminal V
5) For 25 mA use signal type AI 0-10V and install a shunt of 400 Ohms (1 W, 0.1 %). Details: [7].
6) When the process value is out of range, an error message will be sent.
7) AI PT1K375: No restriction concerning hum injection for TXM1.8U und TXM1.8X.
8) An open circuit of a single conductor cannot be detected for these signal types.
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Siemens
Building Technologies
4

Analog input functions

4.1

Measurement

The following analog variables can be processed:
– Temperature, via resistance sensors
– Resistance
– Voltage
– Current
Signal Range
type
P1K
0...2500 Ω
P100
0...250 Ω
R2K5
0...2500 Ω
2)
R250
0...250 Ω
R1K -50...150°C -52.5...155 °C
Ni1K -50...150
1)
(180) °C
Pt1K 375 -50...150
1) 7)
(180) °C
Pt1K 385 -50...400
1)
(600) °C
Pt100_4 -50...400
1)
(600) °C
NTC10K -50...130
1)
(150) °C
NTC100K -40...115 °C -52.5...155°C
T1 -40...125 °C -52.5...155°C
U10 0...10 V
I420 4...20 mA
5)
I25 0...20 mA
) for field supply is not available or low (AI 0-10V)
, CS) for field supply is not available or low (AI 4-20mA, AI 0-20mA)
TX-I/O™ Module system – Functions and operation
Analog input functions
I/O
Under / Reso-
lution status
over range
LED
6)
0...2650 Ω 100 mΩ
0...265 Ω 20 mΩ
0...2650 Ω 100 mΩ
0...265 Ω 10 mΩ
10 mK OFF
-52.5 ...185 °C 10 mK OFF
-52.5 ...185 °C 10 mK OFF
-52.5...610°C 20 mK OFF
-52.5...610°C 20 mK OFF
-52.5...155 °C 10 mK OFF
10 mK OFF
(25 °C)
10 mK OFF
(25 °C)
-1.5...11.5 V 1 mV
1.6...22.4 mA
1 µA
-3.0...23 mA
1 µA
Error indication
LCD
OFF Sensor type
No LCD
OFF (No LCD)
variable variable
No LCD
variable (No LCD)
Sensor type x x x x
Sensor type x x x x
Sensor type x x x x
Sensor type x x x x
(No LCD) No LCD
Sensor type x x x x
x x x
Sensor type
Sensor type x x x
variable variable
variable variable
variable variable
x x
2), 8)
x x
2)
2), 8)
x x x x
x x x x
x x
CM110561en_08
2018-10-25