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ABB AI815 Analogue Input Module

From:ABB | author:Mr.Chen | Time :2024-07-22 | 290 view: | Share:

Features

- 8 channels for 0... .20 mA, 4... .20 mA, 0... .5 V or 1... .5 V d.c. single-ended unipolar inputs.

- 1 group of 8 channels isolated from ground.

- 12-bit resolution.

- Transmitter supply current limited per channel.

- HART direct communication.

AI815 Analogue Input Module

The AI815 analogue input module has 8 channels.

The module can be configured as a voltage or current input. Current and voltage signals cannot be mixed on the same I/O module.

The voltage and current inputs can withstand overvoltage or undervoltage of at least 11 VDC.

Input resistance is greater than 10 M ohms for voltage inputs and 250 ohms for current inputs.

The module distributes external HART-compatible transmitter power to each channel.

This adds a simple connection for power distribution to 2-wire or 3-wire transmitters. Transmitter power is monitored and current limited.

If an external power supply is used to power HART transmitters, the power supply must be HART-compatible.

The module cycles through self-diagnostics.

Module diagnostics include

- External power, transmitter power, and external shunt errors. These errors are reported as external channel errors.

- Analogue readback, reference voltage, internal power supply, checksum, watchdog, and memory. These errors are reported as module errors.

All eight channels are isolated from the module bus as a group. Power to the input stages is converted from the 24 V supply on the module bus.

The module has HART pass-through capability. Only point-to-point communication is supported.

Eight different types of MTUs can be used; the TU830/TU833 Extended MTU allows a three-wire connection to the device without additional terminals.

The TU810 (or TU814) Compact MTU has 24 V process voltage input terminals, but requires external terminals to distribute 24 V power to field devices.

The Extended MTUs, TU835 and TU838 provide one fuse per channel (3 A maximum) for external transmitter power.

The TU818 Compact MTU can be connected to 2-wire transmitters without external commissioning.

The TU812 Compact MTU has a D-Sub 25-pin (male) connector for process connection.

If HART is used, a shielded field cable for process connection is required.

The parameter shunt mode should be set to internal shunt when a current input is required and external shunt when a voltage input is required.

Features AI815 Analogue Input Module

Number of channels 8

Input type Unipolar single-ended

Measuring range 0.... .20 mA, 0... .5 V, 4... .20 mA, 1... .5V 5V

Overrange +15

Input impedance (voltage input) 10 MΩ

Input impedance (at current input) (including PTC) 250 Ω

Maximum field cable length 600 metres (656 yards)

Voltage input, maximum lossless 11 V DC NMRR, 50 Hz, 60 Hz > 40 dB

Maximum error 0.1%

Resolution 12 bits

Maximum temperature drift 50 ppm/°C

Update cycle time 10 ms

Current consumption 24 V (module bus) 50 mA

Current consumption 5 V (module bus) 100 mA

Current consumption 24 V (process power supply, UPx) 339 mA (max) (22 mA + transmitter current * 1.32)

Power dissipation 3.5 W

Transmitter power supply HART compatible

Voltage: 24 V @ 23 mA

Current: 30 mA + - 10%(1)

Monitoring module error if: Analogue readback,

reference voltage, internal power supply,

Checksum, watchdog, and memory errors

External channel error if: external power supply

External power supply low, transmitter power supply error

Input filter (rise time 0-90%) 290 ms

Isolation Configuration Ground Isolation

Module Terminal Unit TU810. TU812. TU814. TU818. TU830.

TU833. TU835. or TU838

MTU keying code CC

Rated insulation voltage 50 V

Insulation test voltage 500 V (AC)

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