Valmet A413792

Technical Specifications: Power supply obtained from DCS rack back‑plane bus, multi‑channel isolated 4‑20 mA analog output, high‑precision D/A conversion, communicate with CPU through Valmet DNA proprietary back‑plane bus.

Functional Features: Channel‑to‑system electrical isolation, per‑channel output status LED indication, output‑circuit fault diagnosis, short‑circuit protection for each output channel, support hot‑swap under redundant system architecture.

Application Scenarios: Paper‑mill flow, pressure regulating‑valve control, power‑plant auxiliary‑loop analog control, chemical‑plant regulating‑actuator drive, process‑industry continuous control loop output.

Performance Parameters: Operating temperature 0 ℃ ~ +55 ℃, output accuracy meet process‑control‑grade requirement, IP20 protection level, conform to industrial EMC standard.

Material Composition: Metal‑reinforced flame‑retardant housing, multi‑layer industrial printed circuit board, isolation and D/A conversion integrated chip, gold‑plated back‑plane connector.

Structural Features: Standard plug‑in rack‑module, front‑panel channel‑status indicator, rear‑side high‑density back‑plane connector, mechanical locking buckle, mechanical dimension compatible with Valmet DNA series chassis.

Working Principle: Receive digital control value sent by DCS CPU via system back‑plane bus, realize digital‑to‑analog conversion inside module, output standard 4‑20 mA current signal to field executing device; detect output‑loop fault condition in real‑time and feed fault‑diagnosis information back to CPU module.

Installation Requirements: Insert module into designated slot of Valmet DNA chassis, lock mechanical buckle, connect field executing‑equipment wiring to matched supporting terminal base, confirm back‑plane bus contact reliable, finish system hardware‑slot identification.

Usage Notes: The load impedance of field output loop shall be within module specification range, forbid short‑circuit output channel for long‑time, avoid heavy‑dust and corrosive‑gas environment, supporting terminal base shall be replaced synchronously when module is replaced.