Description
OMRON CQM1H‑CPU21
Technical Specifications: User program capacity 7.2K steps; maximum I/O points 256 points; DM data memory 6K words; basic instruction execution speed 0.4μs; built‑in RS‑232C communication port; supports up to 11 expansion units; backplane bus power supply; operating temperature 0‑55°C; storage temperature ‑20‑75°C; humidity 10‑90%RH without condensation; lithium backup battery for holding memory data; multi‑group LED indicators for RUN, ERROR and I/O status; DIN‑rail rack‑slot installation; weight approx 230g.
Functional Features: Supports ladder‑logic programming; built‑in RS‑232C port for program download and host‑computer communication; hardware self‑diagnosis identifies program errors, bus faults and internal hardware failures; backup battery retains DM memory data during power‑off; fault‑code storage facilitates troubleshooting; compatible with full range of CQM1‑series I/O and special‑function expansion modules.
Application Scenarios: Small‑and‑medium automated machinery control; packaging‑equipment control systems; conveying‑line automation; machine‑tool auxiliary‑control systems; spare‑part replacement for legacy CQM1H automation installations.
Performance Parameters: Conforms to IEC industrial electromagnetic‑compatibility standards; vibration‑resistance and shock‑resistance meet cabinet‑mount equipment grade; supports continuous 24‑hour operation inside control cabinets.
Material Composition: Black V0 flame‑retardant engineering‑plastic housing; internal FR‑4 multilayer‑layer glass‑fiber PCB; gold‑plated backplane edge‑connector contacts; lithium backup‑battery assembly; industrial main‑control processing chip; high‑brightness LED status indicators.
Structural Features: CQM1‑series rack‑slot form factor; gold‑plated edge‑connector on rear face interfaces with rack backplane bus; front‑panel RS‑232C communication port; multi‑group status LED indicators on front panel; locking latches on both sides fix CPU unit onto rack slot.
Working Principle: CPU runs cyclic scan cycle: reads all input‑module signal states from backplane bus; executes user ladder‑logic program sequentially; refreshes output‑module state data onto backplane bus. RS‑232C port handles program upload‑download and host‑computer data exchange. Internal self‑diagnosis circuit monitors hardware running state continuously, lights alarm‑indicator and stores fault‑code when abnormality occurs. Backup battery maintains data‑memory content when main power supply is lost.
Installation Requirements: Install CPU unit into designated CPU slot of CQM1H main rack; fasten rack to cabinet DIN rail; reserve heat‑dissipation clearance around module; use shielded cable for RS‑232C communication wiring; separate signal cables from high‑power dynamic cables; cabinet requires reliable protective grounding.
Usage Notes: Module hot‑swap is strictly prohibited; replace backup lithium battery periodically to prevent loss of retentive data; complete program backup after programming work; read CPU stored fault‑code for failure analysis; do not deploy in environments with corrosive gas or condensation.
