AMN12

The Yokogawa AMN12 is a high-speed I/O module nest designed to accommodate analog input and output modules in Yokogawa distributed control systems. It provides the mounting and internal connection platform for analog I/O modules, with a high-speed configuration intended for applications requiring faster I/O communication than the standard AMN11 nest.

Function and System Role

The AMN12 serves as the physical mounting and connection platform for analog I/O modules in a Remote I/O (RIO) configuration. It supports the interface between installed I/O modules and the Node Interface Unit, allowing analog process signals to be handled by the Field Control Station (FCS).

Unlike the standard AMN11 analog I/O nest, the AMN12 is specifically designated as a high-speed nest. Yokogawa system documentation identifies it for use with the LFCS (FCS for RIO).

Module Capacity and Installation

The Yokogawa general specifications identify support for up to 16 analog I/O modules in the AMN11/AMN12 nest configuration. Supported module types include current/voltage input, thermocouple and RTD input, pulse input, and current or current/voltage output modules, subject to the documented system configuration.

Important installation restrictions apply:

• AMN12 must be installed in Nest No. 1.
• Nests No. 2 through No. 4 must remain unoccupied.
• When another type of I/O module nest is used together with AMN12, it must be installed in Nest No. 5.
• The 19-inch rack-mountable configuration requires an I/O Expansion Rack.

Technical Specifications

Parameter	Specification
Model	AMN12
Brand	Yokogawa
Product Type	High-Speed Nest for Analog I/O Modules
Application	Remote I/O (RIO)
System	LFCS
Maximum Module Capacity	Up to 16 analog I/O modules
Power Supply	5.0 V DC from Node Interface Unit
Installation	Node Interface Unit or I/O Expansion Rack
External Dimensions	125 x 130 x 248 mm
Weight	4.35 lbs

Frequently Asked Questions

Q: What is the difference between Yokogawa AMN11 and AMN12?

A: AMN11 is the standard nest for analog I/O modules, while AMN12 is the high-speed version. The AMN12 is specifically identified for LFCS applications.

Q: How many analog I/O modules can the AMN12 accommodate?

A: Yokogawa specifies a maximum of 16 analog I/O modules for the AMN11/AMN12 nest configuration. Actual installation must follow the applicable module and system configuration restrictions.

Q: Does the AMN12 require a separate power supply?

A: The nest receives 5.0 V DC from the Node Interface Unit. The documented specification does not identify a separate external power supply for the nest.

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