IS220PAICH2B / H2BE Analog I/O Pack — New Surplus Factory Package

This listing covers new surplus factory package (NSFP) stock of the IS220PAICH2B, referenced on some GE documentation and labels with a further B/E suffix variant. GE's suffix letters mark specific hardware and processor revisions; where we have not been able to independently confirm exactly what a given trailing letter changes, the safest guidance is simple — match the complete part number and revision on your existing unit's label rather than assuming any two PAICH2B-family packs are interchangeable.

What is well documented is the PAIC pack's function: it is the analog I/O pack in GE's Speedtronic Mark VIe (and Mark VIeS) distributed control system, mounting directly on an analog input terminal board through a single DC-37 pin connector and exchanging data with the <R>, <S>, or <T> controller over IONet via dual RJ-45 ports. This H2 pack handles 10 analog inputs (eight configurable to 5 V, 10 V, or 4-20 mA current loop; two more to ±1 mA or 4-20 mA) and 2 analog outputs, with output 1 supporting the H2-specific 0-200 mA range via an add-on daughterboard in addition to the standard 0-20 mA range. Conversion runs through a 16-bit A/D converter and a 14-bit D/A converter at a normal 5 ms (200 Hz) scan rate, and the current-loop load resistors are mounted on the terminal board rather than inside the pack.

Diagnose Before You Install a Replacement

• Check the terminal board and field wiring first — load resistors and connections there produce the same symptoms as a bad channel on the pack.
• Run the swap test: put the suspect pack on a known-good terminal board, or a known-good pack on the suspect board, and see which one the fault follows before you commit to a purchase.
• Rule out IONet issues — verify both Ethernet ports, cabling, and switch health, since a lost network path looks identical to a dead pack from the control room.
• Confirm the terminal board revision supports this pack; an unsupported revision produces a compatibility alarm, not a hardware failure.
• A suicide-relay or output-stage alarm on either analog output is a genuine pack-level symptom, and that's the scenario where replacing the pack is actually the fix.

What the Part Number Tells You

IS220 identifies a Mark VIe distributed I/O pack, PAIC the analog I/O function, H2 the design generation with the 0-200 mA output option, and B (with any further trailing letter on your specific label) a hardware/processor revision that must be matched to your terminal board and ControlST project. When in doubt, send us a photo of the label rather than guessing. Our GE Speedtronic Part Number Decoder explains how GE structures these part numbers end to end.

Related Packs and Boards

PAICH2B-family packs mount on TBAI/STAI-type analog terminal boards. If your system also runs discrete I/O on the same IONet segment, the related packs are PDIA, PDOA, and the combined PDIO. Our GE Mark VI IS200 Boards collection is a good starting point to check terminal board compatibility.

What We Need to Get You a Quote

• The complete part number and every suffix letter exactly as printed on the label
• A photo of that label
• Turbine model and Mark control generation
• Quantity
• Timeline — stock order, planned outage, or urgent replacement

We reply within 24 hours of every request, ship worldwide DDP, and accept purchase orders. Pricing isn't posted on the site — Request a Quote and we'll confirm exact fit, stock, and terms with you directly.