AFF50D-H41101

The Yokogawa AFF50D-H41101 is a duplexed Field Control Unit (FCU) designed to serve as the processor of a Field Control Station (FCS) in the CENTUM control system. It uses a VR5432 processor operating at 133 MHz, with 32 MB of main memory. Its hardware configuration includes dual-redundant V net and ESB bus interfaces, dual-redundant power supplies, and a 100-120 V AC input configuration.

Technical Specifications

Parameter	Specification
Model	AFF50D-H41101
Brand	Yokogawa
Product Type	Duplexed Field Control Unit
Mounting Type	19-inch Rack Mountable
Hardware Type	Compact Type
Processor	VR5432
Processor Frequency	133 MHz
Main Memory Capacity	32 MB
Memory Protection	Battery Backup
Main Memory Backup Time	Maximum 72 hours
Battery Recharge Time	Minimum 48 hours
V net Interface	Dual-redundant
V net Communication	10BASE-2
ESB Bus Interface	Dual-redundant
Power Supply Configuration	Dual-redundant
Supply Voltage	100-120 V AC
Supply Frequency	50/60 Hz
Power Consumption	200 VA
FCU Status Contact Output	2 terminals (NC, C)
Contact Behavior During FCU Failure	Contacts open
Contact Rating	30 V DC, maximum 0.3 A
G3 Option	ISA Standard G3
Weight	8 kg

Processor and Memory Architecture

The AFF50D-H41101 uses a VR5432 processor with a clock frequency of 133 MHz and 32 MB of main memory. As the processing unit of the FCS, it handles the control processing associated with the field control station.

Battery backup protects the main memory during a power interruption. The specified backup duration is up to 72 hours, with a minimum battery recharge time of 48 hours. These values should be considered when evaluating power interruption conditions and battery maintenance intervals.

Communication and Redundancy

The unit provides dual-redundant V net communication using the 10BASE-2 interface. Its ESB bus interface is also dual-redundant in this specific configuration.

The redundant communication interfaces form part of the FCU hardware architecture, allowing the control station to maintain separate communication paths. The AFF50D-H41101 also specifies dual-redundant power supplies. Actual system redundancy behavior depends on the installed system configuration and associated hardware.

Power Supply and Status Monitoring

The AFF50D-H41101 is configured for a 100-120 V AC power supply at 50/60 Hz, with a specified power consumption of 200 VA.

Two FCU status contact terminals are provided, identified as NC and C. The contacts open during an FCU failure, providing a hardwired status indication that can be connected to an external monitoring circuit. The maximum contact rating is 30 V DC at 0.3 A.

Model Configuration and Suffix Identification

The ordering code AFF50D-H41101 identifies a duplexed FCU with a specific hardware and power configuration.

Code	Description
AFF50D	Duplexed Field Control Unit for V net and FIO, 19-inch rack mountable
H	Compact type
4	Dual-redundant V net (10BASE-2), dual-redundant power supply
1	Always 1
1	100-120 V AC power supply
0	Basic type
1	With ISA Standard G3 option

The suffix configuration identifies the unit's communication arrangement, power supply, and hardware option. In particular, the 100-120 V AC supply code distinguishes this configuration from versions specified for other supply voltages.

Frequently Asked Questions

Q: Does the AFF50D-H41101 support dual-redundant ESB communication?

A: Yes. The ESB bus interface is specified as dual-redundant for the AFF50D-H41101. This is a model-specific configuration rather than a general assumption for every AFF50 variant.

Q: What power supply does the AFF50D-H41101 require?

A: This model uses a 100-120 V AC supply at 50/60 Hz. Its specified power consumption is 200 VA. The ordering suffix identifies this AC power configuration.

Q: How long can the main memory retain data during a power failure?

A: The specified battery backup duration for main memory is a maximum of 72 hours. The minimum battery recharge time is 48 hours, which should be considered in maintenance planning.

---