WOODWARD ART-21819-AIO31 Digital Speed Controller

ART-21819 / AIO31 is an I/O module launched by Woodward Company, featuring 31 independent I/O channels, which is used for data acquisition and output execution in industrial automation control systems. As part of the Woodward series of industrial control modules, AIO31 (ART-21819) is typically used in distributed control systems (DCS), programmable logic controllers (PLC) integration, gas/steam turbine control, energy production and control architectures in the oil and gas industry.

The AIO31 module offers a total of 31 channels, which can be configured according to the on-site requirements, and supports various types of input/output signals:
✔ Simulated Input: Supports analog signals such as voltage and current
✔ Simulated Output: Can drive on-site analog actuators or feedback signals
✔ Digital/Digital Quantity: Such as switch input/output, pulses, etc.

ART-21819-AIO31 is widely used in CNC machinery, metallurgy, oil and gas, petrochemical, chemical industry, paper printing, textile printing and dyeing, machinery, electronic manufacturing, automobile manufacturing, plastic machinery, electricity, water conservancy, water treatment/environmental protection, municipal engineering, boiler heating, energy, power transmission and distribution and other fields.

ART-21819-AIO31 supports the Modbus RTU communication protocol and communicates with the upper-level control system (such as PLC, DCS or main control CPU module) through the standard fieldbus. This enables the control system to read data from each channel or send commands to the field modules, achieving:
Remote monitoring and control
Data collection and recording
Fault Alarm and Diagnosis
Parameter setting and condition feedback

ART-21819-AIO31 I/O Module Communication Wiring with PLC/DCS：

┌─────────────────────────────┐
│ Control system(PLC/DCS)│
│ │
│ RS‑485 A ◀▬▬▬▬▬▬▬▬▬▬┐ │
│ RS‑485 B ◀▬▬▬▬▬▬▬▬▬▬┼──────┐│
│ GND ◀▬▬▬▬▬▬▬▬▬▬┘ ││
└─────────────────────────────┘│
│ Modbus RTU
│ Cabling
│
┌───────────────────────────────────────────────────┐
│ Woodward AIO31(ART‑21819) I/O Module │
│ │
│ RS‑485 A ─────────────────────────────────────►│
│ RS‑485 B ─────────────────────────────────────►│
│ GND ─────────────────────────────────────►│
│ │
│ +24V DC Power In (Module power supply is connected to the power cabinet.) │
│ │
│ I/O Passage 1…31 (Connections of each sensor/actuator) │
│ │
│ │
└───────────────────────────────────────────────────┘

✔ Analog Input (AI): Commonly used in industrial sensors such as pressure, temperature, and flow sensors
✔ Analog Output (AO): Sends control signals to valve positioners or controllers
✔ Digital Input/Output (DI/DO): Used for collecting switch status or controlling devices
✔ Specific wiring of channels and signal type needs to be defined based on the pin definitions in the module manual