AMN31 | Yokogawa Nest for Terminal I/O Modules

Product Overview

The Yokogawa AMN31 is an I/O Module Nest for Terminal-Type I/O Modules in the CENTUM CS/VP RIO system. It provides direct M4 screw terminal connections for digital and multiplexer modules, offering a robust, vibration-resistant wiring solution for industrial environments. The AMN31 is the standard choice for permanent installations where wiring reliability is critical.

Key Specifications

• Model: AMN31
• Type: I/O Module Nest for Terminal-Type I/O Modules
• Compatible Modules: AMM12T, AMM22T, AMM32T, AMM42T, AMM52T, ADM11T, ADM12T, ADM51T, ADM52T
• Connection Type: M4 screw terminals (direct field wiring)
• Power Supply: 5.0 VDC from node interface unit
• Mounting: Node Interface Unit or I/O Expansion Rack

Environmental Specifications

• Operating Temperature: 0°C to +50°C
• Relative Humidity: 5% to 95% RH (non-condensing)
• Vibration Resistance: M4 screw terminals provide secure connections in high-vibration environments

Installation Guide

1. Mount the AMN31 in the node interface unit or expansion rack.
2. Install terminal-type I/O modules into the nest slots.
3. Strip field signal cables and connect directly to M4 screw terminals.
4. Torque terminals to Yokogawa specifications (typically 0.8–1.0 N·m).
5. Verify all connections and perform module detection tests.

FAQ

• Q: What is the difference between AMN31 and AMN32?
  A: AMN31 uses direct M4 screw terminals; AMN32 uses KS cable connectors. Both support similar module types but with different wiring methods.
• Q: Can I mix terminal and connector modules in the same nest?
  A: No, each nest is designed for either terminal-type (AMN31) or connector-type (AMN32) modules only.
• Q: What wire gauge is recommended for M4 terminals?
  A: Typically 0.5–2.5 mm² (20–14 AWG) stranded or solid wire; consult the installation manual for exact specifications.
• Q: Is terminal covers available?
  A: Yes, terminal covers (e.g., T9081CF) are available for safety and dust protection.

Selection Tips

• Specify AMN31 for permanent installations where direct, vibration-resistant wiring is required.
• Use AMN32 instead if frequent module changes or reduced wiring time is a priority.
• Ensure proper wire ferrules are used for stranded wire to prevent loose connections.