Description
Honeywell SC-PCMX01 51307195-175
Technical Specifications Plugs into the dedicated memory expansion bus of PM/APM controllers; backplane 5VDC supply; on-board non-volatile and RAM memory; memory parity error detection; on-board power-up self-test; operating temperature 0℃ to 60℃; storage temperature -40℃ to 85℃; humidity 5% to 95% non-condensing.
Functional Features It expands available controller memory capacity to accommodate more process points, batch sequences and trend history. Memory parity checking detects and reports data bit errors. It runs a full memory self-test at power up. It maps into the same unified memory address space as the main controller memory, so user programs require no special modification. It reports memory utilization to the LCN operator station.
Application Scenarios Memory expansion for batch reaction APM controllers in chemical plants; additional point capacity for large refinery PM controllers; trend and alarm buffer expansion in power plant TDC3000 systems; retrofit upgrades for TDC3000 controllers outgrowing on-board memory.
Performance Parameters Memory access timing matches PM/APM bus clock without wait states; parity error detection identifies single bit memory faults; self-test coverage spans all memory cells; access latency matches on-board RAM.
Material Composition FR4 flame retardant PCB with conformal coating; industrial wide temperature memory chips; gold plated expansion bus connector; metal retention bracket.
Structural Characteristics Small vertical daughter card that plugs into the expansion slot of the PM/APM motherboard; front edge has power and memory fault LEDs; elastic locking clips prevent vibration disengagement; passive cooling.
Working Principle At controller power up the main processor scans and identifies the SC-PCMX01 expansion card, mapping it into the unified memory address space. The control program may allocate batch logic, trend buffers and point database records in the expanded memory region. The parity circuit continuously checks each memory byte; a parity mismatch sets a fault flag which the main controller reports to the LCN operator station.
Installation Requirements Power off the controller before inserting the card. Press the card firmly into the expansion slot until locking clips engage. After power up, verify the new memory size is recognized in system software. Cabinet grounding resistance ≤4Ω. Wear anti-static wrist strap.
Usage Notes Compatibility must be confirmed with the specific PM/APM motherboard revision. After adding memory, re-evaluate control scan cycle timing. A faulty card causes controller memory exception; replacement is a board swap. The card is not hot-swappable; power must be removed before insertion.
