Product Core Brief
- Model: IS220PDIOH1B
- Brand: General Electric (GE Vernova)
- Series: Speedtronic Mark VIe / Mark VIeS
- Core Function: Field-mounted combined discrete I/O pack over redundant Ethernet
- Product Type: Discrete Input/Output Pack
- Key Specs: 24 discrete inputs | 12 Form C relay outputs | Dual 100 Mbps IONet
- Condition: New Surplus / Refurbished options available
Product Introduction
The GE IS220PDIOH1B is a combined discrete input/output pack for the Mark VIe Speedtronic turbine control platform. It sits at the field I/O layer, reading 24 contact inputs and driving 12 Form C relay outputs through a DC-62 connector.
Unlike backplane-based I/O, this unit mounts near field devices and communicates over dual redundant IONet Ethernet. That cuts cable runs and allows Class I Div 2 mounting without purging. If you are holding an older IS220PDIOH1A, the H1B is a documented form-fit-function drop-in—but only if you pair it with the correct TDBSH8A or TDBTH8A terminal board.
Frequently Asked Questions
Q: Can I hot-swap this module while the turbine is running?
A: No. Despite what some listings claim, the DC-62 field connector carries live signals and power. Pulling a powered pack can destroy the onboard processor and relay drivers. Isolate power at the terminal board first. If you are working on a TMR set, never mix H1A and H1B packs on the same terminal board during replacement—the manual explicitly warns against it.
Q: My site still runs the IS220PDIOH1A. Is the H1B a true drop-in?
A: For the module itself, yes. GE’s lifecycle notice lists H1B as the direct replacement. The catch is the terminal board. The H1B requires the H8A-suffix boards (TDBSH8A or TDBTH8A). If your old rack uses H2A boards, the pinout and relay driver circuitry differ—forcing an H1B onto an H2A board will damage the unit.
Q: Will I lose the program or configuration when I swap the pack?
A: The program lives in the controller and the ToolboxST configuration, not in the I/O pack. But you will lose the pack’s firmware and IP assignment if you just yank it. Before removal, photograph the label, record the firmware revision in ToolboxST, and note the DIP switch settings if any. After installing the replacement, use the Download Wizard to push the correct firmware. If the Status tab shows a “≠” icon, you have a revision mismatch that must be resolved before the pack will go online.
Q: Are these units genuinely new, or refurbished pulls?
A: Honest answer: the legitimate market for this specific part is almost entirely New Surplus or professionally refurbished stock. GE discontinued the original 2004-era electronics and transitioned to updated technology starting in 2015. If a vendor claims “factory-new current production,” ask for the date code. Many H1B units in circulation are original GE surplus from spares inventories. A proper supplier will state “New Surplus Original Box” or “Refurbished and Tested” without hedging.
Q: What is the realistic warranty and lead time on the IS220PDIOH1B?
A: From established surplus channels, expect a 12-month functional warranty and 3–7 day dispatch from stock. That is the standard for tested Mark VIe packs. If a vendor quotes 8–12 weeks, they are likely drop-shipping or re-exporting, which adds risk of firmware mismatch upon arrival.
