IoT front-end multi-channel sensor data acquisition control module: SYAD02A/04A
Overview
SUNYUAN SY series AD products (Adam module) can realize signal safety isolation and high-precision data acquisition, isolation conversion, monitoring and transmission between sensor and host. Products are widely used in RS-232/485 bus industrial automation control system, 4-20mA / 0-10V signal measurement, monitoring and control, small signal measurement and industrial field signal isolation and long-distance transmission and other remote monitoring applications. Through the configuration of the software, a variety of sensor types can be connected, including current output type, voltage output type and the like.
The product includes power isolation, signal isolation, linearization, A/D conversion and RS-485 serial communication. Each serial port can connect up to 256 SY AD series modules. The communication mode adopts ASCII character communication protocol or MODBUS RTU communication protocol. The instruction set is compatible with ADAM module. The baud rate can be set by the user and can be linked with other manufacturers' control modules. On the same RS-485 bus, it is convenient for host programming.
SY series AD products are intelligent monitoring and control systems based on single-chip microcomputer. All user-set calibration values, address, baud rate, data format, checksum status and other configuration information are stored in non-volatile memory EEPROM.
SY series AD products are designed and manufactured according to industry standards. The signal input/output is isolated, can withstand 3000VDC isolation voltage, strong anti-interference ability and high reliability. Operating temperature range - 45 ° C ~ +80 ° C.
Features
â— Low cost, small size modular design for desktop or rail installation â— Data acquisition isolation converted to RS485/232 support Modbus RTU communication protocol â— Measurement accuracy better than 0.05%, programmable calibration module accuracy â— Signal input / output isolation Withstand voltage 3000VDC
◠Wide power supply range: 8 – 50VDC
â— High reliability, easy programming, easy installation and wiring â— User programmable setting of target module address, baud rate, etc. â— Can be monitored directly based on field data acquisition and display results
typical application
â— Industrial equipment operation measurement, monitoring and remote control â— Intelligent building control, security engineering and other automation system monitoring â— RS232/485 bus industrial automation system remote monitoring â— Sensor signal isolation conversion and long-distance transmission â— Analog signal A/D conversion, adjustment and remote Transmission â— Acquisition and recording of industrial site multi-channel operation data â— Medical and industrial control product development â— Analog 4-20mA/0-10V signal acquisition isolation and transmission
Introduction to SYAD02/4A function
The SYAD02/4A signal isolation acquisition module can be used to measure two or four channels of current or voltage signals that can be common to each other without interfering with each other.
Analog signal input: 24-bit acquisition accuracy, all signal input ranges have been calibrated before leaving the factory. When in use, the user can also easily program and calibrate.
For the specific current or voltage input range, please refer to the product selection. When measuring two signals, the two input selections must be the same.
1. Communication protocol communication interface: 1 standard RS-485 communication interface and 1 standard RS-232 communication interface.
Communication Protocol: Supports two protocols, ASCII character protocol and MODBUS RTU communication protocol. The communication protocol can be programmed to enable network communication with various brands of PLC, RTU or computer monitoring systems.
Data format: 10 digits. 1 bit start bit, 8 data bits, 1 stop bit.
Communication address: (00H-FFH) and baud rate (300, 600, 1200, 2400, 4800, 9600, 19200, 38400bps) can be set; the communication network can be up to 1200 meters long, connected by twisted pair shielded cable . Communication interface with high anti-interference design, ±15KV ESD protection, communication response time less than 100mS.
2. Anti-interference can be set as required. The module has a transient suppression diode inside, which can effectively suppress various surge pulses, protect the module, internal digital filtering, and also can effectively suppress the power frequency interference from the power grid.
Initialize the SYAD02/4A module
When accessing an RS-232/RS-485 network, a unique address code must be assigned to the SYAD02/4A module. The address code is a hexadecimal number between 0x00 and 0xFF. All new SYAD02/4A modules use the same factory initial setup as follows:
The address code is 01H
Baud rate 9600 bps
Suppression checksum
ASCII character communication protocol Because the address codes of the new modules are the same, their addresses will contradict other modules, so when you build the system, you must reconfigure the address of each module. After the SYAD02/4A module power cable and RS485 communication cable are connected, the configuration command can be used to modify the address of the SYAD02/4A module. The baud rate, checksum status, and communication protocol also need to be adjusted according to user requirements. Before modifying the baud rate, checksum status, and communication protocol, the module must first enter the configuration state, otherwise it cannot be modified.
How to get the module into the configuration state
The SYAD02/4A module has a special pin labeled CONFIG. Short-circuit the CONFIG pin to the ground (GND pin), then turn on the power, and the module enters the configuration state. In this state, the module is configured as follows:
Address code is 00H
Baud rate 9600 bps
Suppression checksum
ASCII character communication protocol At this time, you can modify the baud rate, checksum status and other parameters of the SYAD02/4A module through configuration commands. You can also select the communication protocol by setting the communication protocol command of the module. When you are not sure about the specific configuration of a module, you can also configure the jumper to make the module enter the configuration state and then reconfigure the module. If the user needs to set the module to the MODBUS RTU communication protocol, please see the MODBUS communication protocol chapter for instructions.
Module calibration
Calibration must be done under the ASCII character communication protocol. Calibration is not supported under the Modbus protocol.
The product is calibrated at the factory and can be used directly without calibration. The user can also recalibrate the module during use. When calibrating, the module needs to input the appropriate signal, and different input ranges require different input signals.
To improve calibration accuracy, the following equipment is recommended for calibration:
1. A DC voltage/current signal source with stable output and low noise
2. A 5-bit or higher-precision voltage/current measuring instrument monitors the accuracy of the input signal
Calibration process
1. Select the input channel to be calibrated and connect the corresponding input signal according to the input range of the module.
2. The SYAD02/4A module zero point is calibrated at input 0, and the full scale is calibrated at 120% of the input full scale. For example, when inputting 4-20 mA, input 0 mA when calibrating zero, and input 24 mA when calibrating full scale (0V input, 0V when calibrating zero, and 6V when calibrating full scale).
3. Input the zero signal to the channel that the analog input module needs to calibrate, usually 0mA or 0V.
4. After the signal is stable, send an offset calibration $AA1N command to the analog input module (N represents the channel code currently being calibrated, 0 or 1).
5. Input the current or voltage signal of 120% of full scale to the channel that the analog input module needs to calibrate.
6. After the signal is stable, send the gain calibration $AA0N command to the analog input module (N represents the channel code currently being calibrated, 0 or 1).
7. Calibration is complete
General parameters
(typical @ +25°C, Vs is 24VDC)
Input Type: Current Input / Voltage Input Accuracy: 0.05%
Input offset: ±0.1 uA/°C
Temperature drift: ±15 ppm/°C (±30 ppm/°C, max)
Input resistance: 50Ω (4-20mA/0-20mA/0-±20mA current input)
100Ω (0-10mA/0-±10mA current input)
1KΩ (0-1mA/0-±1mA current input)
Greater than 1MΩ (voltage input)
Input protection: Overvoltage protection, overcurrent protection bandwidth: -3 dB 10 Hz
Conversion rate: 10 Sps
Common Mode Rejection (CMR): 120 dB (1kΩ Source Imbalance @ 50/60 Hz)
Normal mode suppression (NMR): 60 dB (1kΩ Source Imbalance @ 50/60 Hz)
Communication: Protocol RS-485 or RS-232 ASCII character protocol and MODBUS RTU communication protocol baud rate (300, 600, 1200, 2400, 4800, 9600, 19200, 38400bps) software configuration address (00H~FFH) software Configure communication response time: 100 ms max
Working power supply: +8 — 50 VDC wide power supply range, internal anti-reverse and overvoltage protection circuit power consumption: less than 1W
Working temperature: - 45 — +80°C
Operating humidity: 10 – 90% (no condensation)
Storage temperature: - 55 — +85°C
Storage humidity: 10 - 95% (no condensation)
Isolation withstand voltage: between input / output: 3KVDC, 1 minute, leakage current 1mA
The output and the power supply are common to the ground.
Impact voltage: 3KVAC, 1.2/50us (peak)
Dimensions: 123 x 70 x 30 (mm)
Detailed technical information:
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