Hollysys K-DO01 8-Channel Isolated Analog Input Module

Hollysys K-DO01 Module Detailed Explanation
This is an 8-channel isolated analog input card specifically designed for the Hollysys K-series DCS system, primarily used for acquiring standard industrial current signals. It is widely applied in process control scenarios such as power generation, chemical processing, water treatment, and metallurgy.

I. Core Basic Parameters
Channel Specifications: 8 independent isolated inputs. Default factory setting is 4-20mA, maximum measurement range is 0-22.7mA. Compatible with two-wire and four-wire transmitters. Channel power distribution/non-power distribution mode can be switched without jumper wires.
Sampling Accuracy: 24-bit ADC sampling; working condition accuracy of 10-45℃ is 0.1% F.S., wide temperature range of -20 to 60℃ is 0.25% F.S.; fastest full-channel scanning cycle is 90ms. Each channel can be customized with filtering parameters for anti-interference.
Power Supply Isolation: Dual isolation design for on-site instrument power supply and system control power supply. It blocks interference from the site from invading the main control unit. Supports dual redundant IO buses and dual redundant power supply. Single-line power failure does not interrupt operation.

Protection & Practical Features

Strong Protection Capability: Native tolerance for ±30VDC misconnection and overcurrent impact; with an enhanced base, it can withstand on-site AC220V high voltage misconnections; the entire machine is sprayed with three-layer anti-corrosion paint, reaching ISA G3 industrial anti-corrosion grade, suitable for humid and dusty factory areas.
Maintenance Convenience: Supports hot-swappable power-on and 1:1 redundant deployment; the panel integrates global (power / communication / fault) + single-channel LED indicator lights, allowing for intuitive identification of broken wires, short circuits, and over-range faults.
Environmental Adaptability: Normal working temperature is 0-55℃, suitable for industrial control room environments, with power consumption of less than 5W.

Typical Applications & Wiring Points Applicable scenarios
Collect the 4-20mA standard signals output by pressure, liquid level and temperature transmitters, and connect them to the DCS main controller to complete process monitoring and closed-loop regulation.
Wiring Specifications
AI + connects to the positive signal line, AI – connects to the negative signal line. Connect the system grounding terminal as needed; for two-wire instruments, they can be directly powered by the module channel power supply, and for four-wire instruments, external independent power supply can be used.