IS220PDIOH1B, REV E - Discrete Input/Output Module

SPECIFICATIONS:

Part Number: IS220PDIOH1B, REV E
Manufacturer: General Electric
Series: Mark VIe
Product Type: Discrete Input/Output Module
Number of input channels: 24
Input Filter: Hardware filter, 4 ms
Input isolation in pack: 1500 V
Input Voltage Range: 5V DC / 24V DC
AC voltage rejection: 60 V RMS
Isolation: Optical or Galvanic Isolation
Output Voltage Range: 5V DC - 250V AC
Contact Rating (Relay Output): 5A
Number of relay command channels: 12
Number of input channels: 24 DI and 12 from C
Operating Temperature: -40°C to +70°C
Mounting Type: DIN Rail
Size: 15.875 cm high x 10.795 cm wide
Country of Origin: United States
Availability: In Stock
Manual: GEH-6721G

FUNCTIONAL DESCRIPTION:

IS220PDIOH1B, REV E is a Discrete Input/Output Module manufactured and designed by General Electric as Part of the Mark VIe Series used in Distributed Control Systems. The Discrete Input/Output (PDIOH1B, REV E) pack provides the electrical interface between one or two I/O Ethernet networks and a discrete input/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 input/output function. The pack accepts up to 24 contact inputs, controls up to 12 relay outputs, and receives terminal board-specific feedback signals. The associated terminal board determines the voltage capability of PDIO. System input to the pack is through dual RJ45 Ethernet connectors and a three-pin power input. Discrete signal input/output is through a DC-62 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.

PDIOH1B, REV E is the functional equivalent of a PDIA and PDIOH1B, REV E I/O pack combined into a single assembly. For simplex applications, it goes on a TDBS terminal board that is the equivalent of an SRLY relay terminal board combined with an STCI contact input terminal board. For TMR applications, it goes on a TDBT terminal board that, with the WROB option, provides the equivalent of a TRLYH1B relay terminal board combined with a TBCI contact input terminal board.

COMPATIBILITY:

PDIOH1B, REV E is compatible with two types of discrete contact input/output terminal boards: TDBS for single PDIO applications and TDBT for TMR PDIO applications. The relay output portion of the terminal board accepts option cards as described later in this document. The following table gives details of the compatibility. Control mode refers to the number of I/O packs used in a signal path:

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

OPERATION:

The processor application code contains all the logic necessary to allow the pack to operate from one or two Ethernet inputs. When operated from two Ethernet inputs, both network paths are active all the time. A failure of either network will not result in any disturbance to the I/O pack operation, and the failure will be indicated through the working network connection. This arrangement is more tolerant of faults than a classic hot-backup system, where the second port is only used after a primary port failure is detected. The Ethernet ports on the processor auto-negotiate between 10 MB/s and 100 MB/s speed, and between half-duplex and full-duplex operation. An industry-standard infrared serial communications port is provided on the processor board. Accessible through the pack front, this port provides diagnostic information on the pack status and the ability to program the pack when both Ethernet connections fail. It is possible to communicate with this port using most notebook computers and most hand-held Personal Digital Assistants (PDA).

• High-speed processor with RAM and flash memory
• Two fully independent 10/100 Ethernet ports with connectors
• Hardware watchdog timer and reset circuit
• Internal I/O pack 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

CONTACT INPUT SIGNALS:

The discrete input/output acquisition board provides the second stage of signal conditioning and level shifting to interface the terminal board inputs to the control logic. Initial signal conditioning is provided on the terminal board. The discrete input acquisition circuit is a comparator with a variable threshold. Each input is isolated from the control logic through an opto-coupler and an isolated power supply. The inputs are not isolated from each other. Each of the twenty-four inputs has filtering, hysteresis, and a yellow status LED that indicates when an input is picked up. The LED will be OFF when the input is dropped out. The LEDs are grouped at the bottom left of the PDIO pack.

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FREQUENTLY ASKED QUESTIONS:

What is the IS220PDIOH1B, REV E Module?

The IS220PDIOH1B, REV E is a Discrete Input/Output (I/O) Module designed for GE Mark VIe control systems. It interfaces the controller with field devices by reading digital input signals and sending discrete output commands to actuators, relays, or alarms. It is critical for turbine protection, control, and process monitoring.

How many channels does it support, and what types of signals?

This module supports 24 discrete channels per board. Input channels can accept dry contacts or voltage-based signals, while output channels are designed to drive relays or solid-state devices. Each channel is electrically isolated to prevent crosstalk and ensure signal integrity.

Where is this module commonly used?

It is primarily used in turbine control systems, industrial process automation, and critical monitoring applications. Typical uses include monitoring switches, sensors, and controlling relays or actuators in safety-critical systems.