SDM-5780A/B is the is 8-Channels Pt100/Pt1000 thermal resistance temperature acquisition module. When the model is "A", RTD Thermistor is Pt100(-200 ~ +650℃) / Cu50(-50 ~ +150℃). When is "B", RTD Thermistor is Pt1000(-100 ~ +300℃) / Pt1000(-150 ~ +550℃). The communication interface adopts 2 ports RS-485 interface, supports standard Modbus-RTU protocol, and can be directly connected with configuration software, PLC, DCS, industrial control touch screen, etc.
Features
1. supports 2-Ports RS-485 Interface and can be connected to two different master stations.
2. Supports standard Modbus RTU protocol and has simple configuration.
3. Supports 1024 Digital and 256 Analog expansion Modbus buffers for easy data exchange between master stations.
4. Provide Windows configuration tool software for module management, configuration, and debugging.
5. Power supply and communication are indicated by LED lights.
6. Supports AC/DC10~30V wide voltage supply, and supports overcurrent and overvoltage protection.
7. Card style design, compact structure, small volume, and small space occupation.
8. I/O interface adopts a press type terminal block, which is fast and convenient to connect.
9. Standard 35mm DIN rail installation.
RTD Thermistor Input
1. Input Points: 8
2. Input Type: SDM-5780A：Pt100(-200 ~ +650℃) / Cu50(-50 ~ +150℃)
                     SDM-5780B：Pt1000(-100 ~ +300℃) / Pt1000(-150 ~ +550℃)
3. ADC Resolution: 16bit ADC, Low Speed Mode: 15bit, High Speed Mode: 13bit
4. Sample Rate: Low Speed Mode: 2 times/s, High Speed Mode: >10 times/s
5. Conversion Value: Temperature = Conversion Value / 10, Offline Value = 32767
6. Accuracy: High Speed Mode: ±1℃, Low Speed Mode: ±0.5℃
7. Line Compensation: 3-Wire Sensor Automatic Compensation
8. Isolation Method: Digital Isolation
Communication interface
1. Communication: 2-Port RS-485(COM2 Port: nternal USB to serial port and Port 2 RS-485 multiplexed COM2 port)
2. protocol: Modbus RTU
3. Interface type: 5.08mm Terminal Block
4. Distance: < 1200m
5. Transfer Rate: 1200~115200bps
6. Isolation: Digital Isolation Chip
7. Master Quantity: 2
8. Parity：No, even, odd
9. Default: 9600, N, 8, 1 (modifiable)
Electrical Characteristics
1. Watchdog: Internal Software Watchdog
2. Power Supply: AC/DC10~30V, 24V @ 100mA (Max.)
3. Power Protection: Reverse Connection / Overcurrent / Overvoltage
4. I/O Interface: Non screw 3.81mm press terminal block
5. Dimensions: Length x Width x Height (mm), 142x96x30 (mm)
6. Shell Material: ABS+PC
7. Installation: 35mm DIN Rail
Environmental Characteristics
1. Operating Temperature -20℃~+70℃
2. Storage Temperature -40℃~+85℃
3. Relative Humidity 5%~95%, No Condensation
4. IP Grade IP20
Indicator light definition
1. PWR: power indication, "bright" power supply is normal
2. SYS: Initialization: Flashing / Running: Off
3. P1 and P2: RS-485 communication indicates that "flash" sends and receives data
Restore Default Settings
When the module is running, press and hold the Default button for 3 seconds until the SYS indicator light starts flashing, then release the Default button to restore the configuration register of the module to its default settings.
Selection Definition
SDM-5780A: 8RTD (Pt100/ Cu50)
SDM-5780B: 8RTD (Pt1000)