I/O modules • 173
Analog Inputs 750-461, (-481)
Technical Data:
Item-No.:
Number of inputs
Input current (internal)
Nominal voltage
Sensor types
750-461
2
65 mA max.
via system voltage
PT 100, PT 200, PT 500, PT 1000, NI 100, NI 120, NI 1000, Resistance test
Wire connection
Temperature Range
Resolution
Isolation DC/DC
Measuring current
Internal bit width
Configuration
Presetting
Operating temperature
Wire connection
2-conductor, 3-conductor (presetting)
200 °C ... + 850 °C (PT), - 60 °C ... + 250 °C (NI)
0.1 °C
400 V System/power supply
0.5 mA typ.
2 x 16 Bit Data, 2 x 8 Bit control/status
None, or via software with the consent of WAGO
3-conductor PT 100
0 °C ... + 55 °C
CAGE CLAMP ; 0.08 mm2 - 2.5 mm2, AWG 28 – 14, 8 – 9 mm Stripped length
Dimensions (mm) WxHxL |
12 x 64 x 100 (from upper edge of carrier rail) |
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The function module 750-461 allows for the direct connection of PTor NIresistance sensors. The module is suitable for 2- or 3-wire RTDs. Connection is made according to the above wiring diagram.
Linearization is accomplished over the entire measurement range by a microprocessor.
The temperature ranges of the above listed RTD types are available to the user. The temperature ranges of the sensors are represented with a resolution of 1 bit per 0.1° C in one word (16 bits). Resulting from this, 0°C corresponds to the hexadecimal value 0000 and 100°C is 03E8 (dec.1000). Temperatures below 0° are represented in two’s complement with a leading ‘1’.
The function module works in the defined temperature range for the PT100 sensors of -200°C to +850°C. The voltage resolution is represented with 16 bits.
An A/D converter and processor converts the voltage value to a numerical value proportional to the temperature of the selected resistance temperature sensor.
A short circuit or an interruption of the RTD wire is transmitted to the bus module and indicated by the red error LED. The green LED identifies that the module is communicating properly with the connected Buscoupler.
Modular I/O System
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