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This multibus keyboard module provides operator interface capability for ABB Bailey INFI 90 systems. It connects a standard keyboard to the control network for data entry and commands. Therefore, it enables operators to interact with turbine control systems directly.
Physical and Interface Specifications
The ABB Bailey IIMKM02 measures 25.0 cm in length and 18.0 cm in width. Moreover, its module weight equals approximately 0.84 kg for rack mounting. A single 48-pin male connector links this module to the INFI 90 backplane. Additionally, the unit includes a standard keyboard connector and status indicators.
| Parameter | Specification |
|---|---|
| Brand | ABB Bailey |
| Full Model | IIMKM02 |
| Category | Multibus Keyboard Module |
| Dimensions (L x W x H) | 25.0 cm x 18.0 cm x 5.5 cm (9.84″ x 7.09″ x 2.17″) |
| Module Weight | 0.84 kg (1.85 lbs) |
| Backplane Interface | 1 x 48-pin Male Connector (INFI 90 Rack) |
| Power Supply Input | 5 VDC from Backplane (0.6 A Typical) |
| Power Consumption | 3.0 W (Typical) |
| Processor Type | 8-bit Microcontroller (8 MHz) |
| Program Memory | 16 kB ROM (Firmware) |
| Data Memory | 8 kB RAM (Battery Backed) |
| Backup Battery | Internal Lithium (3V, 5 Year Life) |
| Keyboard Interface | 1 x 6-pin Mini-DIN Female (PS/2 Standard) |
| Keyboard Protocol | PS/2 (IBM Compatible) |
| Key Code Translation | Yes (102/104 Key Standard) |
| Maximum Cable Length | 3 meters (9.8 feet) |
| Scan Rate | 100 Hz |
| Buffer Capacity | 256 Key Presses |
| Multibus Transfer Rate | 1 Mbps |
| On-Board Components | 1 Microcontroller + 2 Memory Chips + 1 Keyboard Controller IC + 2 Optocouplers + 4 Protection Diodes + 1 Voltage Regulator + 1 EMI Filter + 1 LED Driver IC |
| Energy Storage | 2 x 100 µF Electrolytic Capacitors (35V) + 2 x 10 µF Tantalum (25V) + 1 x CR2032 Backup Battery |
| Battery Backup Time | 5 Years (Typical for RAM Retention) |
| Isolation Rating | 1500 Vrms (Keyboard Port to Backplane) |
| Operating Temperature | 0°C to +55°C (32°F to 131°F) |
| Storage Temperature | -25°C to +85°C (-13°F to 185°F) |
| Mounting Type | INFI 90 Rack (Single Slot) |
| Status Indicators | 1 Green LED (Power) + 1 Green LED (Run) + 1 Yellow LED (Keyboard Active) + 1 Yellow LED (Key Press) + 1 Red LED (Fault) |
Multibus Keyboard Module Features
The ABB Bailey IIMKM02 connects a standard PS/2 keyboard to INFI 90 control networks. Specifically, it translates key presses into multibus messages for the system controller. In addition, the module supports all standard 102 and 104 key keyboard layouts. Moreover, the 100 Hz scan rate ensures that no keystrokes go undetected. Furthermore, a 256-key buffer stores keystrokes during network congestion. Consequently, operators can enter commands and data reliably from a local keyboard.
Keyboard Interface and Key Code Translation
This keyboard module features a standard PS/2 interface for keyboard connectivity. For instance, you can connect any PS/2 compatible keyboard to the 6-pin mini-DIN port. In addition, the module translates scan codes into ASCII or custom command sequences. Moreover, the isolated keyboard port protects the backplane from static discharges. Furthermore, the module supports international keyboard layouts with different key mappings. Thus, the ABB Bailey IIMKM02 provides flexible operator input for INFI 90 systems.
Energy Storage and Data Retention
This keyboard module stores energy using four onboard capacitors for power filtering. Specifically, two electrolytic capacitors smooth the 5 VDC supply for stable controller operation. In addition, two tantalum capacitors provide high-frequency noise suppression for keyboard circuits. Moreover, a lithium battery retains configuration parameters and key mapping tables. Furthermore, the module includes EMI filtering for noise immunity. Therefore, this module preserves keyboard settings for up to five years without external power.
Installation and Diagnostic Indicators
Five LED indicators provide operational status at a glance on this module. First, a green Power LED lights when the 5 VDC backplane supply is present. Second, a green Run LED flashes during normal firmware execution. Third, a yellow Keyboard Active LED illuminates when a keyboard is connected and powered. Fourth, a yellow Key Press LED flashes each time the operator presses any key. Finally, a red Fault LED indicates hardware errors, keyboard failure, or configuration errors. Additionally, the module includes a locking ejector for secure backplane insertion. Thus, you can diagnose keyboard status instantly without external tools.
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