YOKOGAWA FLEXA21 Flexible I/O Module

Advanced Flexible I/O Module for Process Automation

Technical Specifications

Main Features and Advantages

Universal Channel Configuration: The YOKOGAWA FLEXA21 revolutionizes process automation with its truly flexible I/O architecture. Each of its 16 channels can be independently configured as analog input (4-20mA, 0-10V), analog output, digital I/O, thermocouple, RTD, or pulse counter without hardware changes. This eliminates spare module requirements and reduces inventory costs by up to 60%.

Precision Measurement: Featuring 24-bit ADC resolution and ±0.05% full-scale accuracy, the module delivers laboratory-grade measurement capabilities for critical process variables. Advanced noise rejection algorithms maintain signal integrity even in electrically noisy environments, while automatic sensor diagnostics detect open circuits and drift conditions before they impact process quality.

FLXA402

Hot-Swappable Design: Engineered for continuous operation, the YOKOGAWA FLEXA21 supports true hot-swapping without system shutdown. Module replacement takes under 30 seconds with automatic configuration download from the control system, minimizing production losses during maintenance.

Cyber-Secure Architecture: Incorporating Yokogawa’s defense-in-depth security, the module features secure boot, encrypted communications, and role-based access control compliant with IEC 62443 standards. Unauthorized configuration changes are prevented through digital signature verification while comprehensive audit trails track all access attempts.

Intrinsic Safety Options: With ATEX Zone 2 and IECEx certifications, the YOKOGAWA FLEXA21 safely interfaces with hazardous area instruments without additional barriers. Galvanic isolation (1500V) protects control systems from field transients while redundant power inputs ensure uninterrupted operation.

Application Areas

• Oil & gas process control systems
• Pharmaceutical batch processing
• Chemical plant distributed control
• Power plant auxiliary systems
• Water treatment SCADA networks

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