Description

PT100/PT1000 four channel platinum resistance acquisition module, 4 channels can be collected from the same input type platinum resistance, each channel can also input different platinum resistance; full range acquisition range of -200-850 degrees, the display accuracy of 0.1 degrees, acquisition accuracy of 0.05%. and 4 road and 4 road opened. Communication using MODBUS-RTU RS485; can be adapted to PLC, DCS and a variety of configuration software, etc.

Defualt setting is PT100,if need PT1000,please note.

The first chapter product introduction

A.Summary

MB4RTD4roadPlatinum resistance high precisionThe acquisition module, the platinum resistance (PT100/PT1000 385 double excitation current respectively 500uA/250uA) signal; excitation source for double platinum resistance, programmable excitation current source, acquisition speed and precision is higher and faster; analog signal data acquisition, by isolating the RS485 interface output; module using Modbus-RTU communication, can be adapted to PLC, DCS and configuration software.

Signal acquisition, CPU and power input, RS485 communication electrical signal isolation, the effective suppression of all kinds of serial mode and common mode interference, to ensure the accuracy of the data, but also to ensure the reliability of the module.

Two.Characteristic

1.Using standard Modbus-RTU protocol.

2.According to their own needs to set the input signal type channel.

ThreeHigh precision signal acquisition: using high precision 24 bit AD and dual excitation to match the programmable current source.

4.Security: signal acquisition, signal output, power supply, RS485 communication electrical signals isolated from each other.

FiveCommunication protection: RS485 communication signal output interface using overvoltage and over current dual protection.

SixInput signal type, communication format can be set through the software.

7.Power polarity protection.

Three.Technical index

Four.measurement accuracy

Five.Product appearance

Six.Module indicator lamp and switch function specification

1.POW/SET;Module working status indication

A.Green light: the module works in the running state. B. red light: the module has the configuration parameters have been written, need to re power up.

2.TXD/RXD:Communication status indication

A.The green light flashes: the communication receives the data B. red light flashes: the module is sending data

C.The green light is always on: DATA+ and DATA- on the communication line RS485 line is connected to the reverse or the connection is broken

ThreeModule right reset switch

A.When the communication parameters (module address, baud rate, parity bit) do not know or communication parameter misspecification, and can not establish contact module communication, the solution is to reset the communication parameters; we use the clip to hold the reset switch is not open, 5 seconds after the [POW/SET] module of the red indicator lights, release the reset switch, the communication the parameters have been reset, as long as the power supply module after the restart time, the communication parameters of the module has been reset.

B.Communication parameters after reset: Address: 1, baud rate: 9600bps, parity: No.

Seven.Typical application wiring diagram

Eight.Terminal definition