Technical Specifications:

• Analog Inputs: 4 channels, 0–10 V DC or 4–20 mA, 16-bit resolution
• Analog Outputs: 4 channels, 0–10 V DC or 4–20 mA, 16-bit resolution
• Input Impedance (Voltage): > 1 MΩ
• Input Impedance (Current): 250 Ω (burden for 4–20 mA)
• Output Load (Voltage): > 10 kΩ minimum
• Output Load (Current): < 500 Ω maximum (for 4–20 mA)
• Accuracy: ± 0.2% of full scale
• Isolation Voltage: 1500 V DC (input-to-output, channel-to-channel, channel-to-bus)
• Sampling Rate: 1 kHz per channel (all channels simultaneous)
• Supply Voltage: 24 V DC ± 15%
• Power Consumption: Maximum 2.5 W
• Operating Temperature: -20°C to +60°C
• Protection Rating: IP20
• Dimensions: 90 mm x 70 mm x 45 mm
• Weight: 170 g

Material Composition:

• Housing: Flame-retardant polycarbonate, light grey, UL94 V-0
• ADC: Texas Instruments ADS8688 (16-bit, 8-channel, simultaneous sampling)
• DAC: Texas Instruments DAC8568 (16-bit, quad, voltage/current output)
• Isolation: Analog Devices ADuM1401 (digital), Si864x (analog), 5 kV
• Terminals: Phoenix Contact, screw-type, 2.5 mm²

Structural Features:

• DIN rail mountable (35 mm)
• 4 LED indicators for input status, 4 LED indicators for output status
• DIP switches for input range (0–10 V / 4–20 mA) and output range
• Backplane bus connector for controller communication
• Spring-clamp terminals for fast wiring

Working Principle:
Analog inputs are simultaneously sampled by the ADS8688 ADC (16-bit, 1 kHz) via a multiplexed front-end with precision op-amp buffer (OPA2277). The digital data is transmitted over the backplane bus. Analog outputs are generated by the DAC8568 (16-bit quad DAC). For 4–20 mA output, a voltage-to-current converter (XTR116 or equivalent) converts the DAC voltage to a proportional current. All channels are optically isolated from the bus using Si864x isolators (5 kV).

Key Advantages:

• Simultaneous sampling (1 kHz) for all 4 input channels — no skew
• 16-bit resolution (± 0.2% FS) for high-precision applications
• Flexible configuration (0–10 V or 4–20 mA per channel via DIP switch)
• Fully isolated channels prevent cross-talk and ground loops

Applicable Industries:
Process control, water treatment, chemical dosing, HVAC, building automation, test & measurement.

Installation Requirements:

• Mount on 35 mm DIN rail
• Use shielded twisted-pair cable for 4–20 mA signals
• Set DIP switches for correct range before connecting sensors/actuators
• Ground cable shields at one end only

Usage Precautions:

• Do not apply voltage > 12 V DC to 0–10 V input range
• For 4–20 mA output, ensure load resistance does not exceed 500 Ω (for 24 V supply)
• Do not short-circuit 4–20 mA output (can damage DAC)
• Calibrate zero and span annually using precision calibrator