The Yokogawa AFS40S, also cataloged as the AFS40S Duplexed Field Control Unit, operates as a dedicated hardware component for synchronized control logic execution and dual-redundant network routing within CENTUM field input/output (FIO) applications. The processing block executes synchronous system loops natively at the hardware tier to stabilize field-sensor telemetry and coordinate node unit data tracking across distributed industrial networks.
Hardware Specifications
Parameter
Specification
Model
AFS40S
Brand
Yokogawa
Series
CENTUM CS 3000 / VP FIO Subsystem
Origin
Japan
Main Memory Capacity
16 Mbyte volatile core memory matrix
Memory Protection
Integrated battery back-up tracking; 72 hours maximum discharge
250 VAC maximum, 30 VDC maximum / 2 A maximum current
Status Contact Power
125 VA maximum rated AC power handling capacity
V Net Interface
Dual-redundant integrated high-speed control network lines
ESB Bus Interface
Configurable dual-redundant or single backplane bus lines
Local Node Capacity
Maximum 10 Local Node Units per Field Control Unit (FCU)
Remote Node Capacity
Maximum 9 Remote Node Units per Field Control Unit (FCU)
Total Combined Nodes
10 Node Units maximum total combined cluster limit per FCU
Product Type
CPU Processors
Process Control & DCS Instrumentation Interface
High-Density Channel Consolidations and Node Expansion The control unit establishes data-link mapping for up to 10 combined node units, enabling dense channel consolidation at the local and remote tiers. The internal processing layers manage distinct memory tables for local node tracks and remote node interfaces, routing discrete 4-20 mA HART loop protocol lines and valve control registers into unified memory arrays without calculation drift or data skew.
Dual-Redundant V Net and ESB Bus Network Management The communication tier incorporates separate physical transceivers that divide data traffic into distinct zones to prevent packet collisions. The internal logic handles high-speed system tracking over dual-redundant V net control interfaces while simultaneously executing internal rack-to-rack data transfers over specialized ESB bus tracks, isolating high-frequency network spikes from the active logic execution cores.
