GE IS220PAICH1A | Mark VI Analog I/O Pack, 336A4940CSP3

Description

Key Technical Specifications

Product Introduction

On a turbine or critical process skid, the IS220PAICH1A is not a module you discover during a casual audit. It lives inside a Mark VI/VIe VME rack, usually tied to IS200STAIH or IS200TBAIH terminal boards, and it handles analog signals where the control system cannot afford a lazy failure. I’ve seen these packs on gas turbine auxiliaries, compressor controls, and high-availability process racks where TMR voting is the difference between a nuisance alarm and a trip.Engineers specify this pack because it is purpose-built for GE’s IS200 architecture. It supports simplex and TMR configurations, mounts in standard 13-slot or 21-slot VME racks, and carries hazardous-area approvals that matter in real installations. The 27.4 V DC supply reference is worth noting: if your 24 V DC rail is soft, this pack will tell you quickly. Just don’t treat it like a generic analog card. The terminal board pairing, cable harness, and application code all have to match.

Quality SOP & Tech Pitfalls

The Lab Report (SOP)

1. Visual inspection: check IS220PAICH1A label, 336A4940CSP3 reference, connector pins, and conformal coating.
2. Counterfeit check: verify GE/IS200 labeling style, PCB revision, and assembly markings.
3. Live rack test: seat the pack in a compatible VME rack and confirm recognition by the control module.
4. Power check: verify 24 V DC pack supply and LED status with a Fluke 115 or equivalent.
5. I/O port check: confirm communication with an IS200STAIH/IS200TBAIH terminal board.
6. TMR verification (if applicable): confirm pack behavior in simplex and redundant configurations.
7. Firmware/revision logging: record board revision and any identifiable firmware data.
8. ESD-safe packing: anti-static bag, rigid support, and moisture protection.

The Engineer’s Warning (Pitfalls)The most common mistake is swapping the pack without confirming the terminal board type. IS200STAIH1A, IS200STAIH2A, and IS200TBAIH1C are not interchangeable by wishful thinking. Wrong pairing gives you bad scaling, missing diagnostics, or a pack that simply refuses to initialize.The second issue is TMR confusion. If the system runs triple modular redundancy, all three legs must match in hardware revision and application configuration. I once saw a turbine auxiliary rack hunt for a fault for six hours because one leg had a different analog pack revision and the voting logic kept flagging a mismatch. The hardware was fine. The configuration was not.

Installation & Configuration Guide

1. Pre-Installation

• Place the Mark VI/VIe rack in a safe maintenance state.
• Verify 24 V DC supply stability before inserting the pack.
• Photograph the existing pack label, 336A4940CSP3 number, slot location, and terminal board model.
• Record the terminal board type and cable harness routing.

2. Removal

• Label the I/O cable and pack connectors.
• Release the pack retention hardware carefully.
• Remove the IS220PAICH1A without forcing the VME connectors.
• Inspect the backplane and terminal board connector for bent pins.

3. Installation

• Confirm the terminal board matches the application: IS200STAIH1A, IS200STAIH2A, or IS200TBAIH1C.
• Seat the IS220PAICH1A firmly into the correct VME slot.
• Reconnect the I/O cable and verify retention hardware is secure.
• For TMR systems, verify the replacement pack matches the other two legs.

4. Power-On & Testing

• Apply 24 V DC and observe the four front LEDs.
• Confirm the control module recognizes the pack.
• Verify analog channel status through the HMI or diagnostic interface.
• Check scaling, fault flags, and TMR voting if applicable.
• Monitor the pack for at least one full operational cycle before closing the work order.

Compatible Replacement Models

• IS220PAICH1A (same assembly 336A4940CSP3): Drop-in replacement when the terminal board and application dataset match.
• ️ IS200PAICH1A: Earlier GE Mark VI designation for the same analog I/O pack family. Usually compatible, but verify assembly number, board revision, and terminal board pairing before substitution.
• IS220PAICH1B / later revisions: May be compatible depending on firmware and terminal board support. Treat as a like-for-like replacement only after confirming the OEM compatibility matrix.

Frequently Asked Questions (FAQ)

What does 336A4940CSP3 mean?
It is the GE assembly or reference number tied to the IS220PAICH1A pack. Always record it during replacement. Some revisions or build variants carry different suffixes.Can I use this pack with any Mark VI terminal board?
No. It is intended for IS200STAIH1A, IS200STAIH2A, and IS200TBAIH1C families. Using the wrong terminal board will cause scaling errors or commissioning failures.Does this pack support TMR?
Yes. The Mark VI/VIe architecture supports simplex and TMR configurations, but all three legs must be correctly matched and configured.What supply voltage does it need?
The pack operates from a 24 V DC supply, with 27.4 V DC referenced in OEM documentation. If your 24 V DC rail is unstable, fix the power system before blaming the pack.Can I install this in a Series 90-30 or RX3i rack?
No. This is a Mark VI/VIe IS200 VME pack. It does not fit Series 90-30 or RX3i I/O racks.Is this module hazardous-area rated?
Yes. It carries approvals for Class I Div 2 Groups A–D, Class I Zone 2 IIC, and ATEX Zone 2 IIC. Installation must still follow the approved system manual and enclosure requirements.How do I avoid TMR voting faults after replacement?
Match the hardware revision, terminal board type, cable harness, and application configuration. Do not mix legacy and updated packs unless the OEM documentation explicitly allows it.