Description

Yokogawa AFS10D Duplex Field Control Unit

Configured for deterministic execution of regulatory control loops in CENTUM VP and CENTUM CS 3000 platforms, the Yokogawa AFS10D (base model AFS10D Field Control Unit) provides direct physical and electrical interfacing between Remote I/O nodes and the Vnet/IP control network.

Suffix Breakdown & Model Matrix

Code	Specification	Description
Model	AFS10D	Duplexed Field Control Unit (for RIO)
Suffix Codes	-S	Standard type
	5	100 - 120 V AC Power Supply
	6	220 - 240 V AC Power Supply
	7	24 V DC Power Supply
	1	Vnet/IP Type / Dual-redundant

Hardware Specifications

Parameter	Specification
Brand	Yokogawa
Origin	Japan
Weight	9 kg
Dimensions	482.6 mm x 310 mm x 265 mm (19-inch rack)
Operating Temp	0 to 50 degC
Power Consumption	410 VA (max, AC); 8 A (24 VDC)
Input Voltage	100-120 VAC, 220-240 VAC, 24 VDC
Redundancy	Dual-redundant CPU, Power, Bus
Network Interface	Vnet/IP / VL net

FOUNDATION Fieldbus & Profibus PA Connectivity

The AFS10D interfaces with field devices via Remote I/O nodes supporting FOUNDATION Fieldbus H1 and Profibus PA protocols. The control bus maintains deterministic cyclic data exchange with a 50 ms update rate. Channel-to-channel isolation is enforced at 500 VDC to suppress transient noise coupling from field wiring. Cold junction compensation is applied internally for connected thermocouple inputs through the associated I/O modules.

Frequently Asked Questions

Q: What is the maximum inrush current when hot-swapping a power supply module?

A: The redundant power supply allows hot-swap replacement with an inrush current not exceeding 30 A for 50 ms. Verify voltage compatibility before insertion.

Q: Is battery-backed memory retained during complete power loss?

A: Yes. Main memory contents are preserved via a lithium battery backup, maintaining volatile data during outages. Battery replacement requires a scheduled shutdown.

Q: What is the failover time between the active and standby CPUs?

A: Bumpless transfer occurs within 10 ms. Output states remain unchanged during the transition.

Field Installation Guidelines

Mount the unit in a standard 19-inch rack with 150 mm rear clearance for bus cabling. Ground the chassis using a 5/16 inch ring terminal connected to the plant earth grid. Terminate all shield drains at the controller end only. Torque power terminals to 1.2 Nm. Set RIO bus termination switches to ON for the final physical node.

Specifications

• Brand: Yokogawa

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems