Description
Honeywell 51202335-300
Technical Specifications
- User program memory: 128 KB flash expansion
- Data memory: 64 KB RAM expansion
- Backplane interface: TDC3000 process manager expansion slot
- Supply power: 5 V DC from backplane
- Data retention: 10 years non-volatile flash
- Operating temperature: 0 °C to +60 °C
Functional Features Expands process manager program capacity, supports larger control logic for complex units. On-board battery backup for RAM data, retains variables during power outages. Non-volatile flash stores user program, no battery required for logic retention. On-board LEDs indicate memory write activity and power status. Auto-recognized by process manager firmware, no configuration required after installation. Supports expansion of historical trend logging capacity.
Application Scenarios Memory upgrade for TDC3000 process managers running complex control programs Expansion for increased I/O point count during process unit upgrades Additional trend logging capacity for historian integration Spare part replacement for failed memory expansion boards
Performance Parameters
- Memory access time: 70 ns
- RAM data retention: 5 years on backup battery
- Number of erase/write cycles: 100,000 for flash memory
- Operating humidity: 5% to 95% non-condensing
- Mean time between failures: 1,000,000 hours
Material Composition FR4 PCB substrate Flash memory chips SRAM memory chips Lithium backup battery Gold-plated edge fingers Plastic protective chip covers
Structural Features Standard Eurocard dimensions. Memory chips mounted on both board sides for dense packing. Lithium backup battery housed in a removable socket. LED indicates write activity on the front panel. Mounting bracket locks to the process manager chassis.
Working Principle After insertion into the process manager expansion slot, the board’s memory maps into the process manager CPU address space. User program code accesses flash memory for logic storage, while runtime variables write to the expanded RAM. The lithium backup battery maintains RAM data during external power loss. The memory controller arbitrates read and write access, ensuring zero wait state operation for the CPU. Write activity LED flashes during memory programming operations.
Installation Requirements Insert the memory board into the dedicated expansion slot, press evenly until gold fingers are fully seated. Confirm the backup battery is properly installed in its socket. Power up the process manager, verify the board is recognized in system diagnostic software. Download the expanded user program after board recognition.
Usage Notes Replace the lithium backup battery every 5 years; aged batteries lose RAM data retention. Never remove the board while system power is on, this corrupts stored program data. Do not install non-matching memory revisions; incompatible memory causes process manager boot failure. Electrostatic discharge damages memory chips; wear an anti-static wrist strap when handling the board.
