Technical Specifications Advanced 32‑bit RISC high‑speed processor core. RAM capacity reaches 128 MB with ECC error correction function, flash memory is 32 MB for firmware and application storage. Rated power supply 24 V DC, acceptable input voltage range 19.2‑30 V DC. Typical power consumption 18 W. Operating temperature 0 ℃‑60 ℃, non‑condensing relative humidity 5%‑95%. Equipped with dual 10/100/1000 Mbps Gigabit Ethernet interfaces, ModuleBus, CEX‑Bus expansion bus, redundancy control link and dual redundant power input terminals.
Functional Features Supports full IEC61131‑3 standard programming languages for extra‑large‑scale complex process automation. Implements hot‑standby redundancy function when paired with second PM876 unit. Comprehensive hardware self‑diagnosis covers CPU operation, ECC memory error detection, power supply status and every communication channel. Lithium backup battery preserves massive RAM process‑variable data after main power loss. Real‑time clock provides high‑precision time stamp for large‑quantity alarm and event log. Supports online partial program download without stopping heavy‑load running process. Front‑panel multi‑LED array displays power, run, fault, battery and redundancy operating state. 
Application Scenarios High‑end main controller unit for super‑large‑scale petrochemical complex, large metallurgy plant and big‑capacity power‑plant automation cabinet. Used for single heavy‑load controller cabinet and high‑availability redundant controller cabinet. Cooperates with S800 distributed I/O modules for massive‑point field signal acquisition and actuator driving. Integrates with System 800xA operator station for super‑large‑scale process monitoring, huge‑volume historical‑data recording and centralized alarm management.
Installation Requirements Fix dedicated base plate onto cabinet DIN rail or rack bracket, confirm mechanical locking is fully engaged. Wire 24 V DC power supply to detachable screw terminal block strictly following polarity marking. Install ModuleBus terminator and CEX‑Bus terminator at designated slot positions.
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