Emerson HART High Performance Analog Input Module

Emerson HART High Performance Analog Input Module

Module Overview

The HART (Highway Addressable Remote Transformer) high-performance analog input module is a standard Ovation I/O module, updated to the 3rd edition of the Ovation I/O Reference Manual on March 3, 2003, and should be placed between Chapters 14 and 15. It provides 8 globally isolated 4-20mA analog inputs, equipped with HART transceivers, each of which is connected to a dedicated UART through optical isolation communication to maximize HART communication. This module can communicate with HART devices and support "smart" field devices. The analog 4-20mA signal, digital communication, and sometimes power supply of such devices can coexist on the same pair of wires.

Module group

Electronic module: There is only one set of 5X00106G01, which can connect 8 current loop signals with an input range of 4-20mA.

Personality module: There is only one set of 5X00109G01, which includes a printed circuit board component with 8 fuse inputs and user accessible jumper wires. It can be configured with transmitters for on-site or local power supply channels one by one.

Power supply

The logic circuit is powered by a standard+24V Ovation main power supply.

The on-site power supply is provided by a 24V auxiliary power supply, including all 4-20mA loop power supplies, A/D converters, and other output channel components. It can be a standard 24V Ovation auxiliary power supply or an external power supply provided by the user.

It is recommended to use the Ovation cabinet's auxiliary+24V DC power supply. If an external auxiliary power supply is used, its noise should be ≤ 1.2Vrms.

All modules using auxiliary power sources (including HART modules) must use shielded I/O cables to suppress coupling noise and transients.

Technical specifications

Number of channels: 8

Input range: 2.5 to 25mA, with under range and over range checks

A/D resolution: 14 bits

Reference accuracy (@ 25 ° C): ± 0.1% full-scale value (20mA), confidence level 99.7%

Full operating temperature range accuracy: ± 0.24% full-scale value (20mA)

Sampling rate (per second): 20 times when configured for 60Hz suppression; 25 times when configured for 50Hz suppression

Dielectric isolation between channels: 1000VAC/VDC, lasting for 1 minute; Channel and logic: 1000VAC/VDC, lasting for 1 minute

Working temperature range: 0 ° C to 60 ° C (32 ° F to 140 ° F)

Humidity (non condensing): 0% to 95%

Module power consumption: main power supply: typical 4.1W, maximum 4.5W; auxiliary power supply: typical 3.84W (20mA x 8 loops x 24V); Module Dissection: Typical 5.06W (Emod+Pmod)

Input impedance: 300 ohms

Common mode rejection ratio: 120dB for DC or nominal (50/60Hz) line frequency ± 1/2% and harmonics; typical 100dB for nominal line frequency ± 5% and harmonics

Personalized module and wiring information

Personality module: Each channel has a 1/20A fuse for loop protection, and each channel has a pair of user accessible jumpers that can be configured as locally or on-site powered transmitters according to the channel. The fuses and jumpers can be accessed from the top of the module.

Wiring information: There is a simplified wiring diagram label on the side of the personality module, indicating the connection method between the on-site wiring and the base unit terminal block. Each channel has two wiring configurations (depending on the transmitter configuration for local or on-site power supply), and relevant abbreviations are defined.

Register Mapping and Function

The module has 16 direct registers, including indirect memory indexes, analog input channel data, calibration registers, channel error bits, module configuration/status registers, HART enable registers, etc. Among them, module status register # 13 (hexadecimal D) can be read through the operator station's point information window, and word address # 12 (hexadecimal C) is used to report errors in 8 input channels.

Diagnostic LED

P (green): LED with normal power supply, lights up when the+5V power supply is normal.

C (green): Communication is normal LED, which lights up when the controller communicates with the module.

I (red): Internal error LED, which lights up when any error occurs inside the module (except for loss of external auxiliary power supply). Possible reasons include forced error bits in the controller setting module, loss of communication with the controller, etc.

1-8 (green): Eight channel LEDs indicate firmware status during module startup and HART communication activity and analog input health during normal operation.

Other

The requirements for on-site wiring cables can refer to the HART FSK physical layer specification (HFC_SPEC-54).

The point data register is located at positions 2-9, corresponding to analog input points 1-8 respectively.

The HAI, HAO, and IAH modules are capable of retrieving additional variables from field devices, known as "multivariate", including PV (primary variable), SV (secondary variable), TV (tertiary variable), and QV (quarterly variable).