8/16-Channel Isolated Analog Input Module with RS485 Output

Device features:

1. Protect the control loop of the upper stage of the host computer.

2. Reduce the impact of environmental noise on the test circuit, and can overcome inverter noise and various high and low frequency pulsation interference.

3. It suppresses the interference of circulating currents in public ground wires and pulses of frequency converters, solenoid valves, thyristors, etc. to equipment. It also has the function of limiting voltage and current for lower-level equipment. It is a faithful protection for transmitters, instruments, frequency converters, solenoid valves, PLC/DCS input and output, and communication interfaces.

The DIN35 series standard 35mm guide rail card holder structure is easy to install and can effectively isolate: the potential difference between signal input, signal output, power supply and earth.

Product Advantage

1.16-Channel Density with 0.05% Accuracy

Scales from 2 to 16 analog input channels in a single 158×87.5×59mm module. 24-bit ADC with typical accuracy of ±0.02% FS and non-linearity within ±0.05% FS. 50 Sps conversion rate handles dynamic signals. Each channel individually configurable—enable or disable any channel via software command.

2.Universal Sensor Input Including RTD

Accepts current (0-1mA to 0-±20mA), voltage (0-75mV to 0-±10V), and RTD temperature sensors (Pt100, Pt1000, Cu100, Cu50) covering -20 to +400°C. One module replaces multiple signal conditioners. 120dB CMR and 60dB NMR ensure accurate readings in noisy industrial environments.

3.Dual Protocol with 115Kbps Baud Rate

RS-485 and RS-232 interfaces with ASCII character protocol and Modbus RTU. Baud rates from 300 to 115,200 bps—twice the speed of comparable modules. ±15KV ESD protection on communication lines. ADAM command-set compatible for drop-in replacement.

4.9-Point Linear Calibration

Beyond standard 2-point offset/gain calibration, supports 9-point linearization per channel to maximize full-range accuracy. Factory-calibrated and ready to use. All configuration—address, baud rate, data format, protocol—persisted in EEPROM.

5.Rugged for -45 to +80°C

24VDC power with reverse-polarity and overvoltage protection, <8W consumption. Built-in transient suppression diodes and digital filtering reject surge pulses and 50/60Hz power-line interference. 3,000VDC galvanic isolation between input channels and output/communication side.

Technical Parameters

Product Uses

1.Industrial multi-channel data acquisition via RS-485: The module acquires up to 16 channels of analog signals (4-20mA, 0-10V, etc.) and transmits digital data to a host via RS-485. Supports 256 modules per bus with 1200m distance. 24-bit ADC and 0.02% accuracy ensure high-precision measurement.

2.Temperature monitoring with RTD sensors: The module directly interfaces with Pt100, Pt1000, Cu100, and Cu50 RTD sensors for industrial temperature measurement. Supports ranges from -20°C to 400°C. Channel isolation prevents cross-interference between multiple temperature zones in furnaces and reactors.

3.PLC/DCS remote I/O expansion via Modbus RTU: The module serves as a remote I/O unit, converting field analog signals to digital data accessible via Modbus RTU. ADAM-compatible commands enable seamless integration. Each channel independently enabled/disabled via software. Parameters stored in non-volatile EEPROM.

4.Power substation signal acquisition: The module acquires voltage and current signals from power monitoring instruments. 3000VDC isolation and 3KV impulse withstand provide safety barriers. ±15KV ESD protection ensures reliable RS-485 communication in electrically harsh substation environments. 120dB CMR rejects 50/60Hz interference.

5.Smart building automation monitoring: The module monitors HVAC, water level, and air quality sensors in intelligent buildings. Wide -45°C to +80°C range suits rooftop and underground installations. Dual RS-232/RS-485 interfaces offer flexible configuration and networking. Compact 158×87.5mm size enables dense panel deployment.

6.Oil and gas pipeline multi-station monitoring: The module acquires pressure, temperature, and flow signals at remote pipeline stations and transmits via RS-485 to local RTUs. -45°C operation supports Arctic installations. 100ms response time enables near real-time leak detection. Internal surge suppression handles lightning-induced transients.