IS220PDIAH1A, REV C - 24 Discrete Contact Input I/O Module

SPECIFICATIONS

Part Number: IS220PDIAH1A, REV C
Manufacturer: General Electric
Product Type: 24 Discrete Contact Input I/O Module
Function: I/O Module
Series: Mark VIe
Number of channels: 24
Operating temperature: -40 to +70°C
Size: 15.9 cm high x 17.8 cm
Input isolation in pack: Optical isolation to 1500 V on all inputs
Input Filter: Hardware Filter, 4 ms
AC Voltage Rejection: 60 V rms at 50/60 Hz at 125 V dc excitation
Availability: In Stock
Weight: 0.8kg
Repair: 3-7 days
Country of Origin: USA
Manual: GEH-6721D

FUNCTIONAL DESCRIPTION:

IS220PDIAH1A, REV C is a 24 Discrete Contact Input I/O Module manufactured and designed by General Electric as part of the Mark VIe Series used in GE Distributed Turbine Control Systems. The PDIA I/O pack provides the electrical interface between one or two I/O Ethernet networks and a discrete input 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 input function. The pack accepts up to 24 contact inputs and terminal board-specific feedback signals, and PDIA accepts three different voltage levels (with types TBCIH1, H2, and H3 terminal boards). Connections for the isolated discrete input board with voltage sensing (with type TICI board) are available. System input to the pack is through dual RJ45 Ethernet connectors and a three-pin power input. Discrete signal input 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.

• A processor board, which is standardized across all Mark VIe distributed I/O packs. It handles communication, diagnostics, and data exchange with the control system over Ethernet.

• An acquisition board, which is dedicated to the discrete input function and is responsible for acquiring, filtering, and conditioning input signals from the terminal board.

• Supports up to 24 discrete contact inputs, enabling efficient monitoring of field devices such as switches, push buttons, alarms, and relays.

• Capable of accepting terminal-board-specific feedback signals, which enhances signal validation and system integrity.

• Multiple voltage level support: The PDIA pack works with three types of terminal boards – TBCIH1, TBCIH2, and TBCIH3 – which allows compatibility with different discrete input voltage ranges (e.g., 24 VDC, 48 VDC, or 125 VDC).

COMPATIBILITY:

The PDIAH1A I/O pack is designed to interface seamlessly with five types of discrete contact input terminal boards, including TBCI, TICI, and STCI models. However, it is not compatible with the DIN-rail mounted DTCI board. The configuration of I/O packs used in the system depends on the selected control redundancy mode:

• Simplex Mode: Utilizes a single I/O pack, connected via one or two IONet Ethernet connections, providing a straightforward, cost-effective control solution.
• Dual Mode: Deploys two I/O packs, each optionally connected to one or both networks, offering increased reliability through signal duplication and failover capabilities.
• Triple Modular Redundancy (TMR) Mode: Implements three independent I/O packs, each connected to the controller through a dedicated Ethernet network, ensuring maximum fault tolerance and signal integrity for critical applications.

INSTALLATION:

For Simplex configurations, insert one PDIA I/O pack, or for TMR configurations, insert three PDIA I/O packs directly into the appropriate terminal board connectors. Secure each pack by aligning and sliding the threaded studs—located near the Ethernet ports—into the mounting bracket designed for the specific terminal board type. Ensure the bracket is properly adjusted to avoid applying any right-angle stress on the DC-37 connector. This bracket alignment is typically a one-time adjustment over the product’s lifetime.

Connect one or two Ethernet cables, depending on the network configuration. The I/O pack operates using either port; however, in dual-network setups, ENET1 is commonly connected to the R controller’s network to maintain proper redundancy. To power the I/O pack, simply plug in the side-mounted power connector. The PDIA features an integrated soft-start circuit that controls inrush current during startup, eliminating the need to remove power before insertion.

OPERATIONS:

The processor board is connected to an acquisition board that is tailored to the specific function of the I/O pack. When input power is applied, a built-in soft-start circuit gradually ramps up the voltage supplied to the processor board, minimizing inrush current and protecting internal components. Following this, the local power supplies are sequenced, and the processor reset is released, allowing the system to begin its initialization process. The processor then performs a series of self-diagnostic tests to verify hardware integrity. Upon successful completion, it proceeds to load the appropriate application code—stored in onboard flash memory—which is specific to the I/O pack type.

As part of this process, the application reads the board ID information to verify proper compatibility among the application code, acquisition board, and connected terminal board. If the identification data confirms a correct match, the processor initiates Ethernet communication by requesting a network address using Dynamic Host Configuration Protocol (DHCP). This request incorporates the unique identifier obtained from the terminal board to ensure accurate addressing within the I/O network. Once Ethernet initialization is complete, the processor configures the onboard logic, executes the loaded application, and enables the acquisition board to begin real-time operation, thereby completing the startup sequence and allowing the I/O pack to function as an active component of the control system.

• 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

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FREQUENTLY ASKED QUESTIONS:

What types of terminal boards are compatible with this module?

This module is compatible with several terminal board types, including TBCIH1, TBCIH2, TBCIH3, and TICI boards, each supporting different input voltage levels. It is important to ensure the terminal board used matches the required voltage and isolation specifications for the application.

How does the module communicate with the control system?

Communication occurs via dual RJ45 Ethernet connectors that link the I/O module to the I/O network. The module obtains a network address using DHCP based on its unique terminal board ID, allowing seamless integration and communication with the controller.

How do I order replacement parts or get technical support?

For replacement parts or technical assistance, please contact WOC, your trusted supplier of GE Distributed Control System components. Provide your module details, part numbers, and any available diagnostic information to help our experts quickly identify your needs. Our team is available around the clock to support you with accurate parts, repair services, and technical guidance to keep your systems running smoothly.