Description

Specifications:

Overview

MB4RTD 4-channel platinum resistance high-precision acquisition module, platinum resistance (PT100/PT1000 @385 dual excitation current is 500uA/250uA) and other signals; platinum resistance excitation source is a dual-matching programmable excitation current source, with higher acquisition accuracy and speed. Fast; the collected analog signal data is output through the isolated RS485 interface; the module adopts Modbus-RTU communication, which can be adapted to PLC, DCS and various configuration software.

Signal acquisition, CPU and power input, and RS485 communication electrical signals are isolated from each other, effectively suppressing various series-mode and common-mode interference, ensuring data accuracy, and ensuring the reliable operation of the module.

Features

1. Adopt standard Modbus-RTU protocol.

2. You can set the input signal type of the channel according to your needs.

3. High-precision signal acquisition: high-precision 24-bit AD and dual excitation matching programmable current source.

4. Safety: Signal acquisition, signal output, power supply, and RS485 communication electrical signals are isolated from each other.

5. Communication protection: RS485 communication signal output interface adopts overvoltage and overcurrent double protection.

6. Input signal type and communication format can be set by software.

7. Power polarity protection.

AI signal input

1. Input channel: 4-channel isolated analog acquisition

2. Input signal type: platinum resistance (PT100/PT1000) can customize the input of each channel

3. Sampling rate: 4 channels are collected every 200mS (5 collection points per second per channel)

4. Resolution: 24 bit AD capture

5. Collection circuit and CPU isolation voltage protection: 1500V

DI and DO

1. 4-way dry contact optocoupler isolation common ground input

2. 4-way open collector optocoupler isolated common ground output

RS485 communication output

1. Communication protocol: MODBUS-RTU

2. Interface type: isolated RS485 communication, output interface adopts overvoltage and overcurrent double protection

3. Baud rate: 1200bps, 2400bps, 4800bps, 9600bps, 19200bps

38400bps, 57600bps, 115200bps.

4. Parity bit: no parity, even parity, odd parity

5. Setting method: module address, baud rate, check digit can be set by software

6. Communication circuit and CPU isolation voltage protection: 1500V

Module size

A. Individual module size: 104mm*72mm*26mm

B. Size of box with terminal and guide rail: 124mm*72mm*45mm

Installation method: standard DIN rail installation (35mm rail or high and low rail)

Working environment: Temperature: -10 ~ +55℃ Humidity: 35~85% (non-condensing)

Working power

1. Power supply voltage: 10V~30V wide range power supply, with power supply polarity protection

2. Power consumption: less than 3W

测量精度

产品外观

Module indicator light and switch function description

1. POW/SET; module working status indication

A. The green light is on: the module is working in the running state. B. The red light is on: The module has configuration parameters that have been written, and needs to be powered on again.

2. TXD/RXD: communication status indication

A. Green light is flashing: the communication has received data B. Red light is flashing: the module is sending data

C. The green light is always on: the communication RS485 lines connected to DATA+ and DATA- are reversed or the wiring is disconnected

3. Reset switch on the right side of the module

A. When the communication parameters (module address, baud rate, parity digit) are unknown or the communication parameters are set incorrectly, and the communication with the module cannot be established, the solution is to reset the communication parameters; we press the reset switch with a paper clip Release, after 5 seconds, the module [POW/SET] red indicator light will be on, release the reset switch, the communication parameters have been reset at this time, as long as the power of the module is powered off and restarted, the communication parameters of the module have been reset at this time.

B. Communication parameters after reset: address: 1, baud rate: 9600bps, parity bit: none.

典型应用接线图