IS220UCSAH1A / H1AC: the Mark VIe controller that runs your turbine logic

The IS220UCSAH1A is a UCSA controller in the GE Speedtronic Mark VIe family, the standalone computer that actually runs the application code for a gas or steam turbine or its balance-of-plant equipment. Unlike an I/O pack, it does not touch field wiring directly; it executes the control logic and talks to the distributed I/O packs over IONet. This listing is the IS220UCSAH1A in the IS220UCSAH1AC revision, supplied used, cleaned and tested, with a one-year warranty.

How the UCSA controller fits into the Mark VIe

The controller mounts in the control cabinet and runs the QNX real-time operating system on a Freescale PowerPC processor (an MPC8349 PowerQUICC II Pro, 667 MHz). Its application and configuration live on compact flash, and it connects to the rest of the system through the Ethernet jacks on its faceplate: private IONet segments down to the I/O packs, and plant links up to the HMI, operator and engineering stations and to related controls such as Mark VI, other Mark VIe systems and EX2100 excitation. Front-panel LEDs (Power, Boot, Online, Flash, DC and Diag, plus Link/Act per port) give a fast read on where the controller is in its startup and whether it is healthy. It is fanless and rated for Class I, Division 2 areas. Note that the UCSA is not certified for IEC 61508 safety-loop use, so it should not be specified into a SIL-rated protection loop.

Before you replace the controller: what usually is not the UCSA

A controller that will not boot or has dropped offline is often a system problem around the module rather than the module itself. Check these first:

• Compact flash and application load: a missing, loose or corrupt CF card, or an application or firmware version mismatch, will stop a healthy controller from coming online. A replacement UCSA arrives generic and must be loaded with your application and the matching ControlST version.
• IONet and plant network: if the HMI shows the controller offline, test the Ethernet cabling and switches first; comms loss is frequently the network, not the controller.
• DC control power: confirm the feed and watch the DC LED; a weak or lost supply looks like a dead controller.
• I/O versus controller: if only some points are missing, the problem is an I/O pack or an IONet branch, not the controller that is otherwise running.
• Read the Diag LED and ToolboxST: an active diagnostic alarm often names the real fault before you swap any hardware.

Decoding IS220UCSAH1A and the H1AC revision

IS220UCSA identifies the UCSA controller; H1A is the hardware group; the trailing C in IS220UCSAH1AC is the hardware revision. Match the group and revision to the controller you are replacing, and remember that the loaded application must match your unit regardless of hardware revision. Our GE Speedtronic Part Number Decoder walks through the number, and Mark V vs Mark VI: DS200 to IS200 puts the Mark VIe controller generation in context.

Simplex or TMR: where the <R>, <S> and <T> controllers live

A simplex system uses a single controller. A TMR system uses three controllers, one per <R>, <S> and <T> core, working with the voted I/O packs; up to three UCSA modules can be mounted adjacent to serve that redundant arrangement. The UCSA suits balance-of-plant control and many turbine retrofits; for the heaviest model-based control applications GE offered higher-performance controllers in the same family.

What to include in your quote request

Please send the full part number with suffix (IS220UCSAH1AC), the revision, a photo of the module label, the turbine or plant system it controls, the Mark VIe control and ControlST version if known, simplex or TMR, quantity, and urgency. Version details help us confirm the right match.

Request a controller quote

This used IS220UCSAH1AC is cleaned and tested. Request a Quote for a reply within 24 hours, worldwide DDP shipping and purchase orders accepted. See more in our GE Speedtronic Turbine Control Boards collection.

General Information about the Product
Part Number	IS220UCSAH1A Mark VI IS220
Description	GE General Electric IS220UCSAH1A IS220UCSAH1AC Processor Module Mark VI
Condition	used Cleaned and Tested. With 1 Year Warranty.