Description
GE IS220PDIIH1B 336A5026ADP1 | Isolated Discrete Input Module | Mark VIe Turbine Control
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | IS220PDIIH1B |
| GE Part Number | 336A5026ADP1 |
| Manufacturer | General Electric |
| Product Series | Mark VIe Control |
| Product Type | Isolated Discrete Input Module |
| I/O Function | Isolated discrete/contact input |
| Pack Supply | 28.6 VDC |
| Maximum Pack Current | 0.15 A |
| Contact Input Range | 0–32 VDC |
| Terminal Board Family | SDII |
| Network Interface | Dual I/O Ethernet connections |
| Field Connection | DC-37 interface to terminal board |
| Operating Temperature | -30°C to +65°C |
| Installation | Mark VIe distributed I/O architecture |
| Diagnostic Indicators | Power, network/link, I/O/contact status |
GE’s certification documentation confirms the IS220PDIIH1B as an isolated discrete input module and specifies the associated SDII terminal-board family. It also lists the 28.6 VDC input and 0–32 VDC contact-input range.
Product Introduction
The GE IS220PDIIH1B 336A5026ADP1 is a Mark VIe Control isolated discrete input module used to acquire discrete field contacts within GE turbine-control installations. The I/O pack provides the interface between the Mark VIe I/O Ethernet network and an associated SDII terminal board, with the pack handling signal acquisition and local processing before the data is transferred to the control system. GE identifies the module specifically as an isolated discrete input device.
For maintenance engineers, the important point is that IS220PDIIH1B is an input-only I/O pack. It should not be confused with the IS220PDIAH1B, which is the standard Mark VIe Control Discrete Input Module, or the IS220PDIOH1B, which serves a combined discrete I/O function. The exact terminal-board and isolation arrangement must be checked before substituting hardware.
IS220PDIIH1B 336A5026ADP1
Application Scenarios & Field Pitfalls — The Engineer’s Perspective
Engineering Pain Point
A discrete-input failure in a turbine control cabinet can look like a field-device problem even when the actual fault is inside the I/O pack or terminal interface. Before replacing the IS220PDIIH1B, check whether the affected point is actually losing field excitation, whether the terminal-board wiring is intact, and whether the I/O Ethernet path remains healthy.
The module is particularly useful where individual contact inputs require electrical isolation. Depending on the associated SDII/WDII configuration, the Mark VIe architecture can accommodate different input-isolation arrangements. Public technical references describe configurations supporting up to 16 isolated contact inputs, while the exact point count and isolation method depend on the terminal-board and optional-board configuration.
Typical Applications
- Gas turbine control — Monitoring discrete status contacts from valves, switches, permissives, and auxiliary equipment.
- Steam turbine systems — Acquisition of discrete operating and protection-related field signals.
- Combined-cycle power plants — Distributed discrete input collection within Mark VIe control cabinets.
- Industrial turbine auxiliaries — Isolated contact monitoring where different field circuits require separation from the control electronics.
Technical Pitfalls to Avoid
1. Match the terminal board, not just the I/O pack.
GE documentation specifies the SDII terminal-board family for the . A visually similar Mark VIe I/O pack does not automatically have the same terminal-board compatibility.
2. Do not confuse PDII with PDIA or PDIO.
The is specifically the isolated discrete-input version. The IS220PDIAH1B is a different discrete-input module, while IS220PDIOH1B is a discrete I/O module with a different functional arrangement. Selecting by the “PD” prefix alone is not sufficient.
3. Verify the field voltage before energizing the replacement.
GE documentation specifies a 0–32 VDC contact-input range for the . Other field listings sometimes publish much broader or conflicting voltage specifications. The installed terminal-board and optional-board configuration should control the final wiring decision.
4. Check the complete assembly number.
For procurement, identifies the hardware model, while 336A5026ADP1 provides an additional ordering/assembly identifier. Keep both numbers in the purchasing record and compare the label on the replacement against the failed unit.
5. Check environmental requirements for turbine cabinets.
The GE certification documentation gives an ambient range of -30°C to +65°C for the . This is important when the I/O cabinet is located near turbine auxiliaries or in an area with elevated cabinet temperature.
Related Products
- GE IS220PDIAH1B — Mark VIe Control Discrete Input Module; a related discrete-input pack, but not the same isolated-input configuration.
- GE IS220PDOAH1B — Mark VIe Control Discrete Output Module for output-side field control rather than contact-input acquisition.
- GE IS220PDIOH1B — Mark VIe Control Discrete I/O Module; relevant where combined discrete I/O functionality is required.
- GE IS220PTCCH1B — Mark VIe thermocouple input module for temperature measurement.
- GE IS220PAICH1B — Mark VIe analog I/O module for analog field signals.
- GE IS220PAOCH1B — Mark VIe analog output module for analog control signals.
- GE IS220PHRAH1B — Mark VIe HART-enabled I/O module for applications requiring HART field-device communication.
- GE IS220PSCAH1B — Mark VIe serial communications module for serial interface applications.
- GE IS220PSVOH1B — Mark VIe servo control module for turbine servo applications.
- GE IS200SDIIH1A — Associated SDII terminal-board family for isolated discrete input applications; verify the exact terminal-board revision before ordering.
Procurement note: When sourcing , the critical checks are the complete part number, hardware revision, associated SDII terminal board, optional isolation-board configuration, and the existing Mark VIe I/O network arrangement. Do not substitute another IS220-series input pack simply because the connector layout appears similar.
