TX-I/O Modules
NOTE:
4 to 20 mA current handling capability is available on points 1 through 4 (AIs only)
and points 5 through 8 (AIs or AOs).
Power consumption of analog points is included in the power consumption of the
8X module. Power consumption of other approved uses of supply voltage (for
example, 1000 series RTS supply) must also be subtracted from the available 24
Vdc power provided by the TX-I/O Power Supply.
Analog Input Support
Analog input sensor support includes:
1K Nickel – Landis & Gyr curve
1K Platinum – 375 and 385 coefficient
10K and 100K Thermistor – Type II Curve
Technical Data for Analog Inputs on TX-I/O Modules TXM1.8U,
TXM1.8U-ML, TXM1.8X, and TXM1.8X-ML
Compensation of the line
resistance
1 Ohm, calibrated in the module, (except for NTC10K and NTC100K)
Signal type Range Resolution
2)
Sensor current
(cyclic polling)
Temperature Pt1K 375 -50…150 (180) °C
1)
10 mK 1.54 mA
Temperature Pt1K 385 -50...400 (600) °C
1)
20 mK 1.96 mA
Temperature Ni1K (LG-Ni 1000) -50…150 (180) °C
1)
10 mK 1.54 mA
Temperature NTC 10K (-40 ...115 °C)
1)
10 mK (25°C) 0.14 mA
Temperature NTC 100K (-40 ...125 °C)
1)
10 mK (25°C) 0.14 mA
Voltage measuring U10 0 ... 10 V
3)
1 mV
Current measuring I420 4 ... 20 mA 1 mA
Load resistance 490 / 440 Ohm,
pulsed (cyclic polling
of the I/O points)
1)
(extended range) only with reduced hum injection (see below)
2)
This section describes the measured resolution. It is different from the transmitted resolution that the bus delivers into the AI block
and that is transformed by [Slpe] and [Icpt]
3)
The range monitoring of signal type U10 is done with a short NEGATIVE signal of –3,1 V, 0.05 mA (open circuit detection). If a field
device has an open output, a negative voltage could appear there. This can damage any polarized components (e.g. capacitors).
26
Siemens Industry, Inc. TALON TX-I/O Modules and Island Bus Technical Reference
588-587 CONFIDENTIAL: For internal use only 4/6/2010
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