GE IS230SNIDH1A MRP689579 Discrete input package

Description

Product Overview

The GE IS230SNIDH1A (order number MRP689579) is a 16-channel discrete input I/O pack built for the GE Speedtronic Mark VIe turbine control system. It belongs to the Smart Distributed I/O (SDI) family, which means each pack is an intelligent node on the control network rather than a dumb backplane card.

Field wiring lands on a matched terminal board, and the pack plugs on top of it. The board reads dry-contact status from limit switches, pushbuttons, auxiliary relays and interlock contacts, then ships the state changes over IONet Ethernet to the turbine controller. No separate wiring goes to the central rack.

This distributed design cuts marshalling wiring dramatically. A single rack can hold many packs, each serving a local cluster of field devices, and the controller sees them all as one I/O image. The pack is hot-swappable, so a failed unit comes out while the turbine keeps running.

The H1A suffix marks the base hardware revision. Conformal coating and 2.5 kV channel-to-backplane isolation are standard, built for turbine hall conditions.

GE IS230SNIDH1A MRP689579

Core Product Features

• 16 optically isolated 24 VDC discrete input channels accept dry-contact and sinking/sourcing field signals from switches, contacts and pushbuttons.
• Channels are configurable per point, so sinking and sourcing devices can share the same pack without external adapters.
• On-board signal filtering suppresses contact chatter and electrical noise, which is the most common cause of false interlock inputs in turbine racks.
• Channel-to-backplane isolation at roughly 2.5 kV keeps ground loops and surge energy away from the controller side.
• IONet Ethernet communication carries input states to the controller, eliminating the long parallel wiring runs of centralised I/O.
• Hot-swap support lets technicians replace a pack without rack power down, which matters on units that cannot be shut down mid-run.
• Per-channel status LEDs on the front edge give an instant visual check during walkdowns and fault finding.
• Built-in diagnostics flag open circuits, shorted inputs and chattering contacts, so ToolboxST can warn about a deteriorating field switch before it fails.
• The pack mounts on a standard TBCI terminal board, and the field wiring stays put when the pack itself is removed.

Technical Specifications

Some distributor listings quote 32 input channels for this part. The physical terminal count on the pack supports either a 16-channel configuration with paired commons or a 32-channel split, so verify the channel mapping against your ToolboxST configuration and the terminal board label before ordering spares.

GE IS230SNIDH1A MRP689579

Product Details and Application Fields

Product Details

Pack and terminal board split. The IS230SNIDH1A is the electronics pack; the field wires land on a matched TBCI terminal board beneath it. When the pack fails, you pull just the pack. The field wiring stays connected, which is the whole point of the design.

Signal path. A contact closes in the field, the terminal board passes the voltage through, the pack optically isolates and filters it, and the IONet stack publishes the new state to the controller. Latency stays in the low-millisecond range, fast enough for interlock and trip logic.

Dry-contact interrogation. The pack sends a low-energy sense voltage out to detect contact closure. This matters in classified or hazardous areas, because no external power need be routed through the field contacts.

Diagnostics that catch real faults. ToolboxST tracks contact behavior over time. A switch that chatters for a few days shows up as a pattern before it becomes an intermittent trip. Maintenance teams get a warning instead of a surprise.

Hot-swap caveat. The pack swaps live, but the configuration must already match. A brand-new unconfigured pack inserted into a rack will come up with no channel mapping until ToolboxST pushes the project. Pre-configuration on the bench saves outage time.

Cabling rules. Shielded twisted pair grounded at the controller end only. A second ground at the field end creates a ground loop that defeats the isolation the pack is designed to provide.

Application Fields

• Gas and steam turbine interlock and protection status inputs in combined-cycle power plants
• Lube oil, hydraulic and cooling water switch status monitoring on turbine auxiliary systems
• Burner management and boiler interlock contacts in thermal generation
• Emergency pushbutton, trip relay and vibration monitor status inputs
• Mark VIe retrofit projects that replace old centralised I/O with distributed packs
• LNG, compressor and pump station control where remote IONet drops shorten home runs
• Spare stocking for plants standardising on the SDI I/O family across multiple turbine units

GE IS230SNIDH1A MRP689579

Related Model Recommendations

• IS230SNDOH1A (MRP689580) — matching 16-channel discrete output pack from the same SDI family, used alongside SNID for solenoid and indicator control.
• IS230TBCIH1A — terminal board carrier that the SNID pack plugs onto, required for field wiring termination.
• IS230PAICH1A — analog input pack for temperature and pressure transmitters on the same IONet network.
• IS215UCVEH2AE — Mark VIe control engine that collects SNID input states over IONet and runs the turbine protection logic.