IS220PDOAH1A, REV J - Discrete Output Module

SPECIFICATIONS:

Part Number: IS220PDOAH1A, REV J
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 Output Module
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: 26.04 cm high x 1.99 cm wide
Repair: 3-7 Day
Availability: In Stock
Weight: 2 lbs
Country of Origin: United States
Manual: GEH-6721D

FUNCTIONAL DESCRIPTION:

IS220PDOAH1A, REV J is a Discrete Output Module manufactured and designed by General Electric as part of the Mark VIe Series used in GE Distributed Turbine Control Systems. The PDOA facilitates the electrical connection between one or two I/O Ethernet networks and a discrete output terminal board. It includes a common processor board used in all Mark VIe distributed I/O packs and an acquisition board dedicated to discrete output functions. Capable of controlling up to 12 relays, it supports terminal board-specific feedback. It works with electromagnetic relays (TRLYH1B, C, D, and F terminal boards) and solid-state relays (TRLYH1E boards). The pack receives input via dual RJ45 Ethernet connectors and a three-pin power input, while output is handled through a DC-37 pin connector linking to the terminal board. Diagnostic features include indicator LEDs and an infrared port for local serial communication.

COMPATIBILITY:

The PDOAH1A supports six types of discrete (relay) output terminal boards, including TRLY and SRLY boards, but excludes DIN-rail-mounted DRLY boards. The compatibility details are outlined in the table below:

• 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:

The PDOA mounts directly on a Mark VIe terminal board. Simplex terminal boards have a single DC-37 connector that receives the PDOA. TMR-capable terminal boards have four DC-37 connectors, one used for simplex operation and three used for TMR operation. PDOA directly supports all of these connections.

• Insert one PDOA I/O pack for simplex or three for TMR directly into the terminal board connectors.
• Secure the packs using the threaded studs near the Ethernet ports. These studs slide into a mounting bracket specific to the terminal board type. Adjust the bracket to prevent any right-angle force on the DC37 connector. This adjustment is typically needed only once during the product's lifespan.
• Connect one or two Ethernet cables based on system configuration. The pack functions through either port, with standard practice linking ENET1 to the R controller’s network when using dual connections.
• Apply power by plugging in the side connector. Power removal before insertion is unnecessary, as the pack’s soft-start capability manages current inrush during startup.

OPERATION:

The processor application code enables the pack to function with one or two Ethernet inputs. When using both inputs, both network paths remain active, ensuring uninterrupted operation even if one fails. Any failure is indicated through the functioning network connection, offering greater fault tolerance than a traditional hot-backup system, where the secondary port activates only after detecting a primary port failure.

The Ethernet ports automatically adjust between 10 MB/s and 100 MB/s speeds and support both half-duplex and full-duplex modes. An industry-standard infrared serial port on the processor board provides diagnostic data and allows programming if both Ethernet connections fail. This port, accessible from the pack front, is compatible with most notebook computers and handheld PDAs.

• 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.

POWER MANAGEMENT:

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.

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FREQUENTLY ASKED QUESTIONS:

What is the function of the Discrete Output Module?

The Discrete Output Module is responsible for controlling and switching discrete signals in industrial automation systems. It manages up to 12 relays and interfaces with terminal boards to execute on/off control operations.

What types of relays are compatible with the module?

The module supports both electromagnetic and solid-state relays. Electromagnetic relays are used with TRLYH1B, C, D, and F terminal boards, while solid-state relays are designed for TRLYH1E terminal boards.

How does the module communicate with the system?

Communication is established via dual RJ45 Ethernet connectors for input and a DC-37 pin connector for output. The Ethernet connections enable data exchange with the control network, while the DC-37 pin connector links directly to the terminal board.