Description

Yokogawa AMM12C Voltage Input Multiplexer Module

The Yokogawa AMM12C, also cataloged as the AMM12C Voltage Input Multiplexer Module, operates as a dedicated hardware component for sequential scanning and sampling of multiple DC voltage signals within CENTUM CS, CENTUM CS 1000/3000, and early CENTUM VP RIO networks.

HardwareSpecifications

Parameter	Specification
ModelBrand	AMM12C
Origin	Yokogawa, Japan
Weight	0.3 kg
Dimensions	Standard I/O Nest / Backplane form factor
OperatingTemp	-10 degC to +55 degC
PowerConsumption	Dependent on backplane slot rating
Number of Channels	16
Input Signal Types	0-5 V, 1-5 V, 0-10 V DC
Accuracy	±0.1% of full scale
Data Scan / Refresh Cycle	1 s
Isolation	Channel-to-channel and channel-to-system
Redundancy	Dual-redundant support
Mounting	Backplane / I/O Nest

FrequentlyAskedQuestions

Q: Does the AMM12C support hot-swap replacement in a running system?
A: No, the module requires system power-down before removal or installation to maintain signal integrity and prevent backplane damage.

Q: What is the expected channel scan rate?
A: Each module sequentially scans all 16 channels with a typical refresh cycle of 1 second per full scan.

Q: Can the module firmware be upgraded?
A: The AMM12C is a legacy RIO component with no firmware upgrade capability; configuration changes are performed through the host DCS engineering software.

FieldInstallationGuidelines

• Ensure all input voltage signals are within the rated range (0-5 V, 1-5 V, 0-10 V DC).
• Properly seat the module in the I/O nest or backplane slot to maintain signal continuity and redundancy failover.
• Connect shielding and ground wires according to Yokogawa RIO wiring standards to minimize electrical noise.
• Maintain at least 10 mm spacing between adjacent modules when possible to aid heat dissipation.
• Avoid routing high-current or switching signals alongside input wiring to reduce induced noise.
• Observe ambient temperature limits and humidity constraints to ensure stable module operation.

Specifications

• Brand: Yokogawa

Advantages

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