GE IS200EROCH1ABB 8-Pin Keypad Board

Core Specifications: GE IS200EROCH1ABB

• Brand & Model: General Electric IS200EROCH1ABB — authentic EX2100 series board.
• Manufacturer: GE Industrial Systems (USA).
• Product Type: Exciter Regulator Options Card. Functional acronym EROC.
• Series: EX2100 Exciter Control System.
• Mounting: Single slot. Fits Exciter Regulator Backplane (ERBP) and Exciter Regulator Redundant Backplane (ERRB).
• Technology: Surface-mount construction.
• Operating Temperature: -30°C to +65°C.
• Revision: ABB suffix. Factory-configured hardware revision.
• Availability: In stock. Ready to ship.

System Architecture & Configuration Support

• Configuration Support: Functions in simplex systems (ERBP). Functions in redundant systems (ERRB M2/C).
• Board Identification: Integrated ID device. Stores barcode, serial number, board type, and hardware revision. Interfaces with M1 or M2 control.
• Power Indicator: Green LED on faceplate. Illuminates when DC power applies.
• Ground Detection: Supports GE and third-party ground detectors.
• Terminal Board Power: Provides connection for terminal board power distribution.

Keypad Interface & RS-232 Communication

• Keypad Connectors: 8-pin circular DIN on faceplate. Additional connector on backplane (ERBP/ERRB).
• Communication Protocol: RS-232C. Baud rate 1200 to 38.4 K. Transmit and receive lines for keypad data.
• Pin 1 (KPP24): Positive 24V DC power supply for keypad.
• Pin 2 (KPTX232): Transmit line. Carries data from keypad to EROC board.
• Pin 3 (KPRX232): Receive line. Carries data from EROC to keypad.
• Pins 4,5,6 (KPCOM): Common ground. Stable reference for keypad circuit.
• Pin 7 (KPP24): Redundant 24V DC power. Ensures continuous keypad operation.
• Pin 8 (KPRTS232): Request to Send. Flow control for RS-232 communication.
• Bezel Mounting: Supports faceplate-mounted keypads.

Tool Interface & External Computer Connection

• Tool Connector: 9-pin plug on faceplate. Interfaces external computer with IS200DSPX Digital Signal Processor Control board.
• M1/M2 Communication: Supports control channel access. RS-232C protocol at 1200 to 38.4 K baud.
• Ground Loop Isolation: Integrated DC converter. Eliminates ground potential differences.
• Diagnostic Access: Enables field troubleshooting without rack removal.

ECTB Power Distribution

• ECTB Connector: Dedicated interface on EROC board.
• Output Voltage: Positive 70V DC.
• Target Board: Powers contact output section of IS200ECTB Exciter Contact Terminal board.
• Power Path: Direct distribution from EROC to ECTB. No external wiring required.

ISBus Interface & Redundant Rack Communication

• ISBus Connectors: Enable signal exchange between M1 (ERBP) and M2/C (ERRB) sections.
• Physical Layer: Transceivers comply with RS-422 standard. EROC operates on RS-485 (superset of RS-422).
• M2/C Functionality: Full ISBus signal support between M2 and C sections. Both sections transmit and receive system and local channels.
• Signal Routing: Backplane carries signals from transmitting DSPX to EROC. EROC buffers signals. Forwards to receiving DSPX.
• Channel Coupling: Direct connection. No transformer coupling between M2 and C channels. Preserves signal integrity. Reduces distortion.
• Reliability Benefit: Direct coupling optimizes communication speed. Minimizes latency in redundant exciter control.

Physical Characteristics

• Form Factor: EX2100 standard slot card. Fits ERBP and ERRB backplanes.
• Faceplate: Front-accessible panel. Contains green power LED, 8-pin keypad DIN, and 9-pin tool connector.
• PCB Construction: Surface-mount technology. High-density component placement.
• Backplane Interface: Gold-plated edge connector. Matches EX2100 backplane pinout.
• Component Population: Integrated DC converter, RS-232 transceivers, RS-485 ISBus drivers, ID memory device.

Shipping & Availability

• Stock Status: In stock. Ships within 24 hours.
• Carriers: FedEx, UPS, DHL.
• Packaging: Anti-static ESD bag. Foam-lined industrial box.
• What You Receive: 1x GE IS200EROCH1ABB Exciter Regulator Options Card. Faceplate pre-installed. No cables, keypads, or backplane hardware included.

Frequently Asked Questions (FAQ)

1. What is the difference between ERBP and ERRB backplanes?

ERBP supports simplex exciter configurations with a single M1 control. ERRB supports redundant configurations with M2 and C controls. The IS200EROCH1ABB works in both backplane types. You do not need different board variants for simplex versus redundant systems.

2. Does this board include the keypad?

No. The EROC board provides the keypad connector and RS-232 interface. It does not ship with a bezel or keypad assembly. Order keypads separately through GE or third-party suppliers.

3. Can I use the tool connector for permanent communication?

GE designed the tool connector for temporary diagnostic access. It supports M1/M2 communication but lacks locking retention. For permanent connections, use the ISBus or backplane interfaces. The tool connector suits commissioning and maintenance tasks.

4. What is the purpose of redundant KPP24 pins on the keypad connector?

Pins 1 and 7 both carry +24V DC. This provides dual power feed paths. If one pin loses contact, the keypad retains power. This redundancy matters in high-vibration exciter cabinets.

5. Why are M2 and C channels not transformer coupled?

Transformer coupling introduces phase shift and signal attenuation. Direct coupling maintains signal fidelity. The EROC uses differential RS-422/485 signaling. This provides common-mode rejection without transformers. Direct coupling also reduces component count and increases MTBF.

6. How do I verify correct board identification?

Apply power and check the green faceplate LED. Then access the M1 or M2 control software. Navigate to the board inventory screen. The system reads the onboard ID device. Confirm board type displays as EROC and hardware revision matches ABB.

7. What voltage does the ECTB connector output?

The connector supplies positive 70V DC. This powers the contact output section of the ECTB terminal board. Do not use this output for any other purpose. Do not load beyond ECTB specification.

8. Buying advice: Should I choose the ABB revision over older EROC variants?

Yes. The IS200EROCH1ABB includes factory-updated component selections. It resolves early production issues with ISBus driver heat dissipation. It also includes the latest ID device firmware. For new EX2100 installations or critical spares, always select ABB revision.