Description

Yokogawa AMM22J Voltage Input Multiplexer Module

Configured for analog voltage signal multiplexing in CENTUM VP and CS 3000 architectures, the Yokogawa AMM22J (AMM22 Voltage Input Multiplexer Module) provides direct physical and electrical execution for multi-channel voltage acquisition, signal scanning, and A/D conversion across Yokogawa DCS backplane environments.

Suffix Breakdown & Model Matrix

Model	Description
AMM22J	Voltage input multiplexer module for standard DC voltage signal acquisition
AMM22T	Thermocouple input variant
AMM22M	Millivolt input variant

Hardware Specifications

Parameter	Specification
Model	AMM22J
Brand	Yokogawa
Product Type	Voltage Input Multiplexer Module
Number of Channels	16 channels
Supported Signal Types	Standard DC voltage inputs
Input Signal Examples	1-5 V, 0-10 V
A/D Conversion Resolution	12-bit
Measurement Accuracy	+/-0.1 % FS
Scan Cycle Time	Approx. 100 ms per channel
Isolation Type	Channel-to-channel and channel-to-ground galvanic isolation
Isolation Rating	500 VAC/VDC
Nominal Operating Voltage	24 VDC
Power Consumption	2.5 W maximum
System Compatibility	CENTUM CS, CENTUM CS 3000, CENTUM VP
Operating Temp	0 degC to +55 degC
Storage Temp	-20 degC to +70 degC
Relative Humidity	10 % to 90 % RH non-condensing
Vibration Resistance	2 G at 10-150 Hz
Shock Resistance	10 G
Dimensions	12.7 cm x 2.5 cm x 20.3 cm
Weight	Approx. 0.2 kg
Origin	Japan

Channel Isolation and DCS Signal Conditioning

The AMM22J implements channel-to-channel isolation to reduce common-mode interference propagation between analog voltage loops connected to the same multiplexing assembly. Internal multiplexing circuitry performs sequential channel scanning before analog-to-digital conversion within the CENTUM DCS acquisition path.

The module is intended for direct interface with standard process instrumentation producing low-level DC voltage outputs. Isolation barriers assist in minimizing ground loop current circulation between field devices and cabinet grounding structures. Signal routing is internally consolidated through the Yokogawa I/O subsystem backplane without requiring discrete point-to-point acquisition hardware for each channel.

Frequently Asked Questions

Q: Does the AMM22J support online module replacement within CENTUM systems?
A: Replacement capability depends on the specific CENTUM node configuration and controller redundancy arrangement. Field replacement procedures should follow the active controller maintenance sequence defined by Yokogawa system documentation.

Q: What input signal category is supported by the AMM22J?
A: The module is designed for standard DC voltage input acquisition, including typical industrial voltage ranges such as 1-5 V and 0-10 V process signals.

Q: Is external signal isolation required for each field channel?
A: The module incorporates internal galvanic isolation between channels and ground references. Additional external isolation may still be applied when field grounding systems contain high transient potential differences.

Field Installation Guidelines

• Verify cabinet grounding continuity before energizing field voltage loops connected to the module.
• Route analog voltage wiring separately from AC power conductors, relay coils, and VFD output cables.
• Use shielded twisted-pair instrumentation cable for low-level voltage signal transmission.
• Terminate cable shields at a single designated cabinet grounding point to reduce induced noise currents.
• Confirm 24 VDC supply polarity prior to insertion into the DCS I/O rack.
• Avoid exceeding specified environmental temperature and humidity limits during cabinet operation.
• Maintain sufficient spacing between analog signal wiring and high-current terminal blocks within the enclosure.

Specifications

• Brand: Yokogawa

Advantages

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