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Main Functions

Distributed real‑time process control execution: Executes function‑block algorithms for closed‑loop PID regulation, sequence logic, interlock and calculation. It undertakes core field control tasks independent of operator stations to guarantee continuous process operation.
I/O module scanning & data acquisition: Continuously scans matched IOP‑series analog and digital I/O cards, collects field sensor signals including pressure, flow, level, temperature and equipment status contacts.More products: www.plcva.com

Metso PDP401 Distributed Processing Unit for maxDNA Distributed Control System

Multi‑port network communication: Interacts with operator workstations, other DPUs and third‑party devices over maxNET industrial Ethernet. Supports data exchange with PLC and RTU equipment via system bus and external network interfaces.
Event & trend data recording: Generates high‑resolution 1 ms Sequence‑of‑Events (SOE) logs, process trend data and alarm records for fault tracing and process‑performance analysis.
Local hardware self‑diagnosis: Monitors processor running status, backplane bus communication, I/O channel faults and internal hardware anomalies. Status LED indicators display running and fault information for on‑site troubleshooting. Fault messages are uploaded to DCS operator stations.
Redundancy‑supported architecture: Supports dual‑redundant hot‑standby deployment. Upon primary unit failure, the standby DPU takes over control seamlessly to avoid process shutdown.
Modular rack‑mount structure: Installs inside remote processing unit cabinet on maxPAC backplane. Cooperates with mixed‑configuration IOP I/O modules to expand system measuring and control points.plcva.com

Metso PDP401 Distributed Processing Unit for maxDNA Distributed Control System

Applicable control system: Metso maxDNA legacy distributed control system.
Typical target industries: Pulp & paper mills, thermal power plants, chemical plants, waste‑to‑energy facilities and other continuous‑process industries.
Controlled field equipment: Valves, pumps, fans, conveyors and other process‑site actuators connected via IOP I/O modules.plcva.com
Purpose: Acts as core distributed processing controller of maxDNA DCS. It implements on‑site real‑time data acquisition, closed‑loop control, logic interlock and data‑recording functions. It serves as critical spare‑part for existing running maxDNA installations to sustain long‑term stable plant‑automation operation.