1 product introduction
M-3002 (8 way analog input acquisition module based on Modbus) is widely used in metallurgical, chemical, mechanical, fire, fire, construction, electric power, transportation and other industrial industries as a general analog quantity acquisition module. It can access 0 to 20mA, 4 to 20mA, 0 of the output of temperature, humidity, liquid level, pressure, flow, pH value and so on. Analog signals ranging from 5V to -5 to 5V, 0 to 10V, and -10 to 10V. It supports the standard Modbus RTU protocol, and has the function of communication timeout detection. It can be used in conjunction with other devices that follow the Modbus RTU protocol.
1.1 system overview
The M-3002 module is mainly composed of power supply circuit, analog input sampling circuit, isolated RS485 transceiver circuit and MCU. The high speed ARM processor is used as the control unit, and the isolated RS485 communication interface has the function of ESD, overvoltage and over current protection, which avoids the influence of the industrial field signal on the module communication interface and makes the communication stable and reliable.
1.2 main technical indicators
1) system parameters
Power supply voltage: 5 ~ 40VDC, power supply back protection
Power consumption: 0.5W
Working temperature: -10 C ~ 60 C
Storage temperature: -40 C ~ 85 C
Relative humidity: 5% to 95% non condensation
2) analog input parameters
Number of inputs: 8
Normal input range:
Current input: 0 ~ 20mA, 4 ~ 20mA, input impedance 250 ohm;
Voltage input: 0 ~ 5V, -5 ~ 5V, 0 ~ 10V, -10 ~ 10V, input impedance 1M n.
ESD voltage: 7KV
Signal to noise ratio: 96dB SNR
ADC resolution: 16 bits
Sampling precision: 0.1%
3) communication interface
Communication interface: RS485 interface, isolation 1500VDC, + 15kV ESD protection, overcurrent protection
Isolation voltage: 1500V
Communication protocol: Modbus RTU protocol
Baud rate: 1.2k, 2.4k, 4.8k, 9.6K, 19.2k, 38.4k, 57.6k
Communication data format: 1 starting bits, 8 data bits, no, odd or even parity, 1 or 2 stop bits.
1.3 shape and size
Shell material: ABS engineering plastics
Size: 145mm (long) * 90mm (wide) * 40MM (high)
Installation: Standard DIN35 guide rail installation and screw installation.