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Technical Specifications
| Parameter | Value |
|---|---|
| Brand | GE |
| Model | A16B-1211-0040/07A |
| Category | CPU Memory Board |
| Weight | 1.18 lbs (0.54 kg) |
| Dimensions | 9.1 x 6.8 x 1.4 inches |
| PCB Layers | 6-layer board |
| Component Count | 198 discrete components |
| Memory Type | DRAM + EPROM |
| Total Storage | 2MB DRAM, 1MB EPROM |
| EPROM Sockets | 2 x 32-pin sockets |
| Backup Battery | 3.6V lithium with holder |
| Cache Memory | 32KB static RAM |
| Operating Voltage | 5V DC ±5% |
| Current Draw | 650 mA from 5V bus |
Physical Construction and Component Density
This A16B-1211-0040/07A memory board measures 9.1 inches in length. Its width reaches 6.8 inches with a thickness of 1.4 inches. The total weight comes to approximately 1.18 pounds. Manufacturers packed 198 discrete components onto this six-layer PCB. These components include memory ICs, bus drivers, and decoupling capacitors. The high layer count minimizes signal interference between traces.
Memory Architecture and Storage Resources
A16B-1211-0040/07A provides 2MB of dynamic RAM for program execution. Two 32-pin EPROM sockets accept firmware chips for system boot. The EPROM sockets support 27C010 or 27C020 memory devices. A separate 32KB static RAM cache accelerates processor data access. A 3.6V lithium battery retains DRAM contents during power loss. This battery mounts directly on the board with a holder. Consequently, field replacement takes only a few minutes.
Energy Storage and Power Management
The CPU memory board integrates twelve 47µF tantalum capacitors. These capacitors filter transient noise from the 5V power supply. Additionally, four 1000µF electrolytic capacitors provide bulk energy storage. Total current consumption reaches 650 milliamps from the 5V DC bus. Voltage regulation uses discrete transistor circuits rather than integrated regulators. Therefore, the board dissipates moderate heat through its copper ground plane.
System Integration and Application Use
You will find this board inside GE CNC controller cabinets. It serves as the main program memory for Series 16 systems. The A16B-1211-0040/07A operates reliably from 0°C to 55°C ambient. Many machine tool builders rely on this memory board for parts storage. For example, it stores complex machining programs and tool offsets. Additionally, it holds PLC ladder logic for auxiliary machine functions.