Yokogawa AFS40S Field Control Unit 16MB Vnet/ESB for CENTUM CS 3000

Product Overview

The AFS40S is a field control unit (FCU) for the Yokogawa CENTUM CS 3000 production control system. It serves as the intelligence core of the field control station (FCS), executing real-time control algorithms and managing I/O communication via dual-redundant Vnet and ESB bus interfaces. With a VR5432 133 MHz RISC processor and 16 MB of main memory, the AFS40S provides reliable control for medium-scale process applications.

Key Specifications

• System: Yokogawa CENTUM CS 3000
• Processor: VR5432 RISC CPU, 133 MHz
• Main Memory: 16 MB
• Memory Backup: Battery-backed, max. 72 hours retention
• Battery Recharge Time: Minimum 48 hours
• Network Interfaces: Dual-redundant Vnet, single or dual-redundant ESB bus
• Local Node Units: Max. 10 per FCU
• Remote Node Units: Max. 9 per FCU (max. 8 per ER bus)
• FCU Status Contact: 3 terminals (NC, NO, C), 250 V AC / 30 V DC, max. 2 A
• Mounting: Cabinet-integrated
• Operating Temperature: -20°C to +60°C
• Power Supply: 100–120 V AC, 220–240 V AC, or 24 V DC (suffix dependent)

Features & Benefits

1. Proven RISC Architecture: The VR5432 133 MHz processor delivers deterministic control execution for continuous and batch processes.
2. Dual-Redundant Vnet: Redundant control network ensures uninterrupted communication with operator stations and peer controllers.
3. Flexible ESB Bus: Supports single or dual-redundant ESB bus configurations to match availability requirements and budget constraints.
4. 72-Hour Memory Backup: Battery-backed RAM retains control programs and historical data during power failures.
5. High Node Capacity: Supports up to 19 total node units (10 local + 9 remote) for large-scale I/O expansion.

FAQ

Q: What is the difference between AFS40S and AFS40D?
A: The AFS40S is a single (standard) field control unit. The AFS40D is a duplexed (redundant) field control unit with dual processors and power supplies for fault-tolerant operation.

Q: Can the AFS40S be upgraded to redundant operation?
A> The AFS40S is a single-unit design. For redundancy, replace it with the AFS40D duplexed field control unit.

Q: What is the maximum number of I/O modules per AFS40S?
A> Node capacity depends on the node unit type. The AFS40S supports up to 10 local node units, each accommodating multiple I/O modules. Total I/O count is determined by node unit configuration.

Installation Guide

• Install the FCU cabinet in a controlled environment within the specified temperature range.
• Connect Vnet cables to both primary and redundant network segments.
• Connect ESB bus cables to local node units.
• Wire the FCU status contact to an external alarm panel for failure indication.
• Verify battery voltage and memory backup status before commissioning.

Selection Tips

• System Generation: The AFS40S is designed for CENTUM CS 3000. For newer CENTUM VP installations, consider the AFS30S or AFS30D series.
• Redundancy Needs: For processes where controller failure is unacceptable, specify the AFS40D duplexed unit instead of the AFS40S.
• Node Planning: Calculate local vs. remote node requirements. Remote nodes require ER bus cables and are limited to 8 per ER bus segment.