IS220PDOAH1B, REV E - Discrete Relay Output Terminal Board

SPECIFICATIONS:

Part Number: IS220PDOAH1B, REV E
Manufacturer: General Electric
Series: Mark VIe
Number of Channels: 24
Inputs: 125 V dc, 15A
Input Impedance: 4-20 mA
Input Converter Resolution: 16-bit A/D Converter
Product Type: Discrete Relay Output Terminal Board
Output Fuses 12 fuses: 250 Volt, 15 A
Output Converter: 12-bit
Temperature Operating: -30 to +65 C
Memory: 128 MB of flash memory
Ethernet: 10BaseT/100BaseTX (RJ-45)
Microprocessor: Intel Celeron 300 MHz
Size: 8.26 cm high x 4.19 cm
Technology: Surface Mount
Repair: 3-7 Day
Availability: In Stock
Weight: 2 lbs
Country of Origin: United States
Manual: GEH-6721D

FUNCTIONAL DESCRIPTION:

IS220PDOAH1B, REV E is a Discrete Relay Output Terminal Board manufactured and designed by General Electric as part of the Mark VIe Series used in GE Distributed Turbine Control Systems. The PDOA provides the electrical interface between one or two I/O Ethernet networks and a discrete output terminal board. The pack contains a processor board common to all Mark VIe distributed I/O packs and an acquisition board specific to the discrete output function. The pack is capable of controlling up to 12 relays and accepts terminal board-specific feedback. Electromagnetic relays (with types TRLYH1B, C, D, and F terminal boards) and solid-state relays (with type TRLYH1E boards) are available. Input to the pack is through dual RJ45 Ethernet connectors and a three-pin power input. Output is through a DC-37 pin connector that connects directly with the associated terminal board connector. Visual diagnostics are provided through indicator LEDs, and local diagnostic serial communications are possible through an infrared port.

COMPATIBILITY:

PDOAH1A is compatible with six types of discrete (relay) output terminal boards, including the TRLY boards and SRLY boards, but not the DIN-rail mounted DRLY boards. The following table gives details of the compatibility:

• Simplex uses one I/O pack with one or two network connections.
• Dual uses two I/O packs with one or two network connections.
• TMR uses three I/O packs with one network connection on each.

INSTALLATION:

• For simplex configurations, insert a single PDOA I/O pack into the terminal board connector. For TMR configurations, use three packs. Secure them using the threaded studs near the Ethernet ports, which slide into a terminal board-specific mounting bracket.

• Adjust the bracket to prevent right-angle force on the DC37 connector between the pack and terminal board—this is typically a one-time setup for the product's lifespan.

• Connect one or two Ethernet cables based on system configuration. The pack functions via either port, with the standard setup linking ENET1 to the R controller's network.

• To power the pack, plug in the side connector. Disconnecting the power cable beforehand is unnecessary, as the I/O pack includes a soft-start mechanism to regulate inrush current during power application.

OPERATION:

PDOA relay command signals perform initial signal conditioning and level shifting to connect terminal board outputs with the control logic. Each output uses an open collector transistor circuit with a current monitor to detect when it is activated and linked to a load. Status LEDs and monitor outputs provide feedback, indicating activation and connection to the terminal board. If the output is active but the expected load is not detected, the status LED remains off, and the monitor line returns false.

The PDOA includes power management in the 28 V input circuit. The management function provides a soft start to control current inrush during power application. After applying power, the circuit provides a fast current limit function to prevent a pack or terminal board failure from propagating back onto the 28 V power system. When power is present and working properly, the green PWR indicator will light. If the current limit function operates, the indicator will be out until the problem is cleared.

• High-speed processor with RAM and flash memory
• Two fully independent 10/100 Ethernet ports with connectors
• Hardware watchdog timer and reset circuit
• Local ambient temperature sensor
• Infrared serial communications port
• Status-indication LEDs
• Electronic ID and the ability to read IDs on other boards
• Substantial programmable logic supporting the acquisition board
• Input power connector with soft start/current limiter
• Local power supplies, including sequencing and monitoring

RELAY COMMAND SIGNALS:

The PDOA relay command signals are the first stage of signal conditioning and level shifting to interface the terminal board outputs to the control logic. Each output is an open collector transistor circuit with a current monitor to sense when the output is picked up and connected to a load. The status LEDs and monitor outputs indicate when an output is picked up and connected to the terminal board. If output is picked up and the correct load is not sensed, the status LED will be off and the monitor line will be false.

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FREQUENTLY ASKED QUESTIONS:

What is a Discrete Relay Output Terminal Board?

A Discrete Relay Output Terminal Board is a component used in industrial control systems to interface between digital output signals and external devices, such as solenoids, motors, and alarms. It provides electrical isolation and allows the switching of higher voltage loads.

What types of loads can the relay output board handle?

The terminal board can handle AC or DC loads, depending on the relay type. Standard configurations support loads ranging from low-voltage signals (e.g., 24V DC) to higher-power applications like 120V AC or 240V AC.

How is the terminal board connected to the control system?

The board typically connects via a DC37 or other industry-standard connector to an I/O pack or control module, enabling seamless integration with a distributed control system (DCS) or programmable logic controller (PLC).