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IS220PDIOH1A is a discrete input/output module manufactured and designed by General Electric (GE), belonging to the Mark VIe series. It is commonly used in industrial turbine control systems. Here are its detailed specifications:
- Product Model: IS220PDIOH1A
- Manufacturer: General Electric (GE)
- Series: Mark VIe Speedtronic
- Category: I/O Package Module
- Rated Voltage: Minimum rated voltage of 27.4VDC; nominal rating of 28.0VDC.
- I/O Channels: Includes 16 digital input channels and 16 digital output channels, with each channel capable of handling 24VDC signals.
- Input Current: 7mA per channel.
- Output Current: 0.5A per channel.
- Isolation Voltage: Optoelectronic isolation is used between field signals and the system, with an isolation voltage of up to 1500V.
- Ethernet Ports: Features two 10/100 Ethernet ports, which are connected and fully independent.
- Operating Temperature: -20°C to +60°C.
- Dimensions: Approximately 17.71 × 13.77 × 7.87 cm.

- Plug-and-Play: The system can automatically identify the module type, enabling plug-and-play functionality.
- Channel Isolation: Channels are isolated from each other, so a fault in one channel does not affect the normal operation of other channels.
- Overcurrent Protection: The module is equipped with its own overcurrent protection function and can resume normal operation after the fault is eliminated.
- Output Readback Confirmation: DO channels adopt a data output readback confirmation method to ensure the reliability of data output.
- Redundancy Design: Can incorporate built-in output voting algorithms, output self-test, and fault reporting mechanisms. It supports multiple redundancy combinations such as single and dual configurations.

The front panel is equipped with LED indicators to display the status of the two Ethernet ports, device power status, and “attn” (attention) status, as well as LED indicators related to relay connections. A 3-pin power input and two RJ45 Ethernet connectors serve as the system inputs of the module. A DC-62 connector is directly connected to the corresponding terminal block connector for input and output of discrete signals.
Suitable for various industrial automation and control applications, including:
- Process control
- Manufacturing automation
- Building automation
- Water and wastewater treatment
- Renewable energy systems

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