Technical Specifications Each PM864A CPU adopts 32‑bit RISC processor. RAM capacity per CPU unit is 16 MB, flash memory is 4 MB for firmware and application storage. Rated power supply 24 V DC, acceptable input voltage range 19.2‑30 V DC. Single unit typical power consumption is 6.9 W. Operating temperature 0 ℃‑60 ℃, non‑condensing relative humidity 5%‑95%. Each CPU unit carries dual 10/100 Mbps Ethernet ports, ModuleBus, CEX‑Bus, redundancy control link and dual redundant power input terminals. Each CPU supports maximum twelve CEX‑Bus peripheral modules. Protection class IP20 for cabinet‑mount installation. Comply with industrial EMC immunity standard for heavy electromagnetic interference environment.
Functional Features Executes full IEC61131‑3 standard programming languages for complex process automation. Built‑in 1+1 hot‑standby redundancy, primary‑standby data synchronization runs continuously, bumpless switch‑over occurs upon primary CPU fault. Comprehensive self‑diagnosis monitors CPU operation, memory integrity, power supply status and all communication channels for both CPU units. Lithium backup battery preserves RAM variable data for each unit during main power outage. Real‑time clock provides high‑precision time stamp for alarm and event log. Supports online partial program download without stopping running process. Front‑panel LED indicators on each CPU show power, run, fault, battery and redundancy operating state. Expand communication capability by installing CEX‑Bus communication modules for multiple industrial fieldbus protocols. Internal power reservoir circuit completes orderly controlled power‑down for each CPU when power drops temporarily.
Application Scenarios Main redundant controller unit for petrochemical, energy, chemical and pulp‑mill high‑reliability automation cabinet. Designed for production sites where controller shutdown will cause serious safety hazard or heavy economic loss. Cooperates with S800 distributed I/O modules for field signal acquisition and actuator driving. Integrates
Installation Requirements Mount two dedicated base plates onto cabinet DIN rail or rack bracket, confirm mechanical locking is fully engaged for both positions.
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