MODBUS RTU RS485 isolation and lightning protection 8 road 0-20mA 4 0-5V analog input acquisition module |

MODBUS RTU RS485 isolation and lightning protection 8 road 0-20mA 4 0-5V analog input acquisition module |

811228115

The sixteen decimal data from the collected picture is not 00 represented by the precision of the decimal floating point type, which is more proof that the module can carry out high precision acquisition in real time.
First, product overview:
L 12 single end analog input (8*20mA + 4*5V) and 16 bit industrial AD acquisition chip
L uses RS485 MODBUS RTU standard communication, and can be netted with configuration software, PLC, industrial touch screen and so on
L belt communication indicator
L communication circuit adopts lightning protection, overcurrent, overvoltage, anti-interference design, real industrial lightning protection
L can be widely used for signal acquisition and control of industrial field equipment
L this module supports 485 upgrades. In the absence of returning to the factory, you can customize the program to facilitate the upgrade and maintenance.
Two. Main parameters
L analog input channel 12 single end
L analog input type DC type 0-20mA/4-20mA + voltage 0-5V
L analog input precision current: + 0.001mA, voltage + 0.3mV
L working temperature range -20~60 C
L external power supply DC 9~36V or AC 9~24V 2W
L isolation protection 1500V
L installation standard DIN guide installation or screw installation
L shape size 125*73*35mm
Three. Interface definition

Five. The main advantages of modules
(1) the isolation of the RS485 interface, the voltage and current analog acquisition module of the Modbus protocol. It can be netted with PLC, configuration software, text display and so on, which can be widely used in the signal control of industrial field equipment.
(2), AC and DC wide working voltage: DC 9~36V or AC 9~24V, the power supply is positive and negative. The original MC34063A switching power supply 36V can work normally, and the measured DC 12V power consumption is 65mA.
(3), working temperature: -20 C ~ +60 C.
(4), the internal reference voltage VREF=0.256V
A, precision: 0.256V + 0.05%
B, drift: 7 ppm/ C
Low reference voltage means that very small signals can be measured directly, such as 75mV DC shunt, bridge output, and so on. Thus, a precision amplifier can be saved.
(5) the output of various data formats:
A, 32 bit standard IEEE-754 floating-point number format, data without any conversion, is the analog input value.
B, 32 - bit sampler digital output code, the user can be calculated by each LSB equivalent of the equivalent input.
C, 16 bit unsigned integer output, the data unit is mu A, mV.
D, BCD code output format, using the most commonly used 8421BCD code output
(6) the sample number is 16, and the resolution is high.
The acquisition input type module uses a high-speed 16 bit AD sampler, with a numerical range of -32768-32767.
Again, the standard with 3 speed 16 AD difference, each responsible for 4 channel sampling, so it can measure negative input. 0-20mA this specification can be completely measured from -15mA to 0 to +20mA, 0-30V, and can be completely measured from -20V to +30V. (if other voltages are required, please explain, for example, positive and negative 24V input. ) the type of register, the floating-point number, the symbol integer, and the digital output are all signed. Each current input interface is protected by access to 100mA current limiting protection.
Six. A brief introduction to a series of products
1, model naming specification
L MD01[S, D]-[12, 6, 8][V, I][xxx]
L MD01: representing the Modbus RTU analog acquisition module
L [S and D]:S are the single end input series; D refers to the difference input series
L [12, 6, 8]: the number of channel input
L [V and I]:V are voltage input; I refers to current input
L [xxx]: voltage and current input specifications, unit mA, V. For example, I20 indicates that the current range is input to 20mA; V30 indicates that the voltage range is input to 30V; V005 indicates that the voltage range is input to 0.05V.
2. Classification and picture of product model
The commonly used models are as follows:
L MD01S-12I20 12 channel current single end input (0 - 20mA 16 bits)
L MD01S-12V30 12 circuit voltage single end input (0 - 30V 16 bits)
L MD01S-8I20-4V30 8 circuit current +4 circuit voltage (of which IN1-IN8 is current input 0-20mA, IN9-IN12 is voltage input 0-30V).
L MD01D-6I20 6 channel current differential input (-20mA - +20mA 16 bit)
3. Internal interface structure
Because of the VREF=0.256V, the full voltage of the input to the AD chip is 0.256V, and the proper selection of the resistance network can ensure that the resolution is high enough.

19600N81

2

3

3.1 03H06H00H

3.2 11H00H

00 11 00 00 00 01 3D D8

3.3 03H

VREF=0.256V

LSB

16

-32768 - 32767

0.256V/32767=7.81262μV

16

-32768 - 32767

0.256V/32767=7.81262μV

LSB

MSB = 0=()*LSB*

MSB = 1=)*LSB*

RS485