Yokogawa AFV40S/AFV40D Field Control Unit (FCU)

Yokogawa AFV40S/AFV40D Field Control Unit (FCU)

Product positioning

Core role: AFV40S/AFV40D is the core component of the CENTUM VP Field Control Station (FCS), responsible for "field signal acquisition, control logic operation, equipment linkage control" functions, adapted to FIO (Field Input/Output) systems, supports remote I/O node expansion, and is widely used in process industries such as petrochemicals, power, and pharmaceuticals.

Differentiated design: AFV40S is a single configuration unit suitable for non safety critical scenarios; AFV40D is a dual redundant configuration (with redundant power supply, processor, and communication bus), suitable for critical control circuits that require extremely high reliability, such as reactor temperature control and emergency shutdown systems.

Core technical specifications

（1） General basic parameters

Power outage data protection

The main memory is equipped with battery backup, with a maximum power-off protection time of 72 hours and a battery charging time of at least 48 hours, ensuring that control programs and configuration parameters are not lost after power failure and do not need to be reloaded after re powering on.

READY contact output: 3 terminals (NC normally closed, NO normally open, C common terminal), switch contact state in case of FCU fault (such as NC opening and NO closing in case of fault), contact rated parameters: maximum 250V AC/30V DC voltage, 2A current, 125VA power, can be connected to external alarm or monitoring equipment.

communication interface

Vnet/IP interface: Dual redundancy design (AFV40S can provide single/dual power supply, AFV40D requires dual redundancy), used for communication with the operator station (HIS) and other control units of the CENTUM VP system, in compliance with industrial Ethernet standards, ensuring reliable data transmission.

ESB bus interface: AFV40S supports single configuration or dual redundancy, AFV40D enforces dual redundancy and is used to connect FIO node units (ANB10 series) or optical ESB bus relay modules (ANT401/ANT411), expanding on-site I/O access capabilities.

Environmental monitoring (HK function)

Built in HKU (House Keeping Unit) monitors the environmental status of the connected cabinet (such as temperature and fan operation status) through the HK bus or optical ESB bus, and displays the HKU operation status on the HIS (Human Machine Interface), supporting system alarm output.

HK bus parameters: Supports connecting HKUs to cabinets such as ACUKT1/ACUKT2/ACB51/XLCabinet, with a maximum of 9 cabinets connected to a single FCU. The total length of the HK bus cable (AKBHKU) is up to 100 meters (daisy chain connection).

（2） Equipment configuration inside the cabinet

Standard equipment

Each FCU cabinet includes: 1 FCU, 1 distribution board with built-in HKU (supporting single/dual power), 2 vertical power bus units (AEPV7D, 1 front and 1 rear), up to 4 node fan units (ANFAN, 2 front and 2 rear, depending on the number of nodes), and 4 cabinet door fan units (AIP601, 2 front and 2 rear cabinet doors).

FCU module configuration

Power module: Supports PW481/PW482/PW484, dual redundant configuration requires 2 modules of the same model to ensure seamless switching in case of power failure.

Processor module: Supports CP471 (CENTUM VP R6.05 and above) or CP461 (default standard), dual redundancy configuration requires 2 modules of the same model, and only authorized engineers from Yokogawa can perform the replacement of CP461 to CP471.

ESB bus coupler module: Supports EC401 (single/dual redundancy) or EC402 (single/dual redundancy), with two identical modules required for dual redundancy configuration to expand ESB bus nodes (EC401 supports up to 9 nodes, EC402 supports up to 11 nodes).

I/O module: Supports up to 6 non-standard I/O modules, which need to be selected according to the type of on-site signal (such as analog input, digital output) and adapted to the FIO system.

（3） Power supply and power consumption

Description of parameters AFV40S/AFV40D (maximum node configuration)

The supply voltage of 100-120V AC/220-240V AC (50/60Hz) and 24V DC should be specified through suffix codes, such as "1" representing 100-120V AC and "4" representing 24V DC

Maximum power consumption (100-120V AC) 2500VA node unit power consumption at full configuration, reduced power consumption in single node configuration

Maximum power consumption (220-240V AC) 2860VA-

Maximum power consumption (24V DC) 71A-

Power protection dual power redundancy (AFV40D mandatory, AFV40S optional) The distribution board supports dual power input and automatically switches in case of failure

（4） Mechanical and environmental parameters

Cabinet size and weight

Dimensions (width x depth x height): approximately 600mm x 800mm x 2105mm (including cabinet), with dimensional tolerances in accordance with the JEM 1459 standard (± 0.8mm below 120mm, standard tolerances above 120mm).

Weight: The empty cabinet weighs about 240kg, and the maximum node configuration (11 node units) is about 360kg. During installation, it is necessary to ensure that the load-bearing bracket of the cabinet meets the load requirements.