YOKOGAWA AAM21 S2 Analog Input Module

The YOKOGAWA AAM21 S2, also cataloged as the AAM21 Analog Input Module, operates as a dedicated hardware component for dual-channel isolated analog voltage and current signal acquisition within YOKOGAWA CENTUM control systems.

Suffix Breakdown & Model Matrix

The catalog designation for the AAM21-S2 defines the base hardware architecture and revision parameters:

• Base Model (AAM21): Analog Input Module architecture for voltage and current signal acquisition
• Suffix ( S2): Hardware revision 2 designating standard nest mounting and interface parameter set

Hardware Specifications

Channel-to-Channel Isolation and 4-20 mA HART Loop Signal Acquisition

The AAM21-S2 provides 1500 VAC galvanic isolation between individual channels and internal backplane logic to prevent ground loop currents and suppress common-mode electrical noise. Operating at a 16-bit analog-to-digital conversion resolution with a 10 ms per channel sampling cycle, the module converts standard process signals—including 4-20 mA HART loop protocol field devices and +/-10 V transducers—into digital data frames for DCS backplane transmission.

Frequently Asked Questions

Q: What input signal ranges can be configured on the AAM21-S2 module?

A: The module accepts 0 to 10 V DC and +/-10 V DC voltage inputs, as well as 0 to 20 mA DC and 4 to 20 mA DC current inputs across its 2 isolated channels.

Q: What is the dielectric isolation rating between the individual input channels?

A: The module features channel-to-channel galvanic isolation rated at 1500 VAC to prevent cross-talk and signal distortion in noise-prone industrial environments.

Field Installation Guidelines

De-energize rack power prior to mounting or removing the AAM21-S2 module in the system I/O node slot. Observe electrostatic discharge (ESD) protection procedures, wearing a grounded wrist strap when handling the card. Align the module with guide rails and seat the rear connector firmly into the backplane socket, securing top and bottom retaining screws to establish frame ground continuity. Wire analog inputs using shielded twisted-pair cables, bonding the shield wire to earth ground at a single cabinet termination point to prevent ground loops. Maintain physical separation between low-voltage signal cables and AC power conductors.