Product Overview
The YOKOGAWA AMM42 is a specialized 2-wire transmitter input multiplexer module engineered by Yokogawa, a global leader in industrial automation and Distributed Control System (DCS) technology. As a critical I/O expansion component for Yokogawa’s CENTUM VP DCS (and compatible with other industrial control systems), the YOKOGAWA AMM42 is designed to efficiently aggregate analog signals from multiple 2-wire transmitters—such as pressure, temperature, and flow sensors—and transmit standardized data to the central control unit (e.g., YOKOGAWA CP451-50 processor module). This functionality eliminates the need for dedicated I/O modules for each transmitter, significantly reducing hardware costs and cabinet space while maintaining precision in process monitoring.
Built to withstand the harsh conditions of industrial sites, the YOKOGAWA AMM42 complies with IEC 61000-6-2 (EMC immunity) and features a robust design that operates reliably in temperature ranges from 0 °C to +60 °C (32 °F to +140 °F). Key capabilities include support for -4 to 20 mA DC input signals, integrated transmitter power supply (23.5-24.5 V DC), and configurable input resistance (250 Ω standard, 70 Ω for barrier compatibility)—all tailored to streamline sensor integration in petrochemical, power generation, and pharmaceutical processes. Whether monitoring multiple pressure points in a refinery pipeline or temperature sensors in a bioreactor, the YOKOGAWA AMM42 delivers cost-effective, reliable signal multiplexing for mission-critical process control.
Hainan Jinlin Mechanical & Electrical is a distributor of industrial control products, specializing in a wide range of brands. We possess extensive industry knowledge and market insights. Adhering to the "Customer First, Forge Ahead" business philosophy, we provide high-quality customer service. We're here for you, dedicated to meeting your needs!
Technical Specifications
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Parameter
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Value
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Product Model
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YOKOGAWA AMM42
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Manufacturer
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Yokogawa
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Product Type
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2-Wire Transmitter Input Multiplexer Module
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Input Signal Type
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Analog: -4 to 20 mA DC (multi-channel, typical 8-16 channels)
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Allowable Input Current
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≤ 40 mA (per channel)
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Transmitter Power Supply
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23.5 to 24.5 V DC (output power limit: ≤ 60 mA total)
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Input Resistance
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250 Ω (standard); 70 Ω (configurable for barrier connection)
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Signal Isolation
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No isolation (system-to-field, channel-to-channel)
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Power Consumption
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≤ 4 A (at 5.0 V DC, from DCS backplane)
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Compatibility
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Yokogawa CENTUM VP DCS (R6.03+), third-party PLC/SCADA systems via standard analog interfaces
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Operating Temperature
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0 °C to +60 °C (32 °F to +140 °F)
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Protection Features
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Overcurrent protection (per channel), ESD protection (±15 kV air), short-circuit protection
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Mounting Type
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DIN rail mounting (standard control panel) or backplane mounting (CENTUM VP compatible chassis)
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IP Rating
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IP20 (module), IP40 (when installed in enclosed control cabinet)
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Diagnostic Capabilities
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Channel-level fault detection (open/short circuit), power supply voltage monitoring, signal overload alert
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Core I/O Synergy with CENTUM VP Ecosystem
The YOKOGAWA AMM42 plays a pivotal role in optimizing the efficiency of Yokogawa’s CENTUM VP DCS, particularly when paired with the YOKOGAWA CP451-50 processor module. Here’s how this integration enhances process control:
1. High-Density Sensor Aggregation
By multiplexing up to 16 2-wire transmitter signals into a single module, the YOKOGAWA AMM42 reduces the number of I/O slots required in the CENTUM VP chassis. For example, a petrochemical plant monitoring 32 temperature sensors would need 4 standalone analog input modules without the AMM42—but only 2 AMM42 modules with the multiplexer, cutting hardware costs by 50% and freeing up chassis space for other critical components (e.g., YOKOGAWA VC401-10 valve control modules). The module’s integrated 24 V DC power supply also eliminates the need for external power sources for transmitters, simplifying wiring and reducing installation time.
2. Precision Signal Transmission to CP451-50 Processor
The YOKOGAWA AMM42 converts raw sensor signals into standardized -4 to 20 mA DC outputs, which are seamlessly transmitted to the YOKOGAWA CP451-50 processor via the CENTUM VP backplane bus. With a signal accuracy of ±0.1% of full scale (at 25 °C), the module ensures the processor receives reliable data for control logic execution—critical for applications like pharmaceutical batch processing, where even minor temperature deviations can affect product quality. For instance, in a bioreactor system, the AMM42 aggregates data from 8 dissolved oxygen sensors and sends consistent signals to the CP451-50, enabling the processor to adjust aeration rates in real time (via VC401-10 valve modules) and maintain optimal growth conditions.
3. Simplified Maintenance & Troubleshooting
Equipped with channel-level fault detection, the
YOKOGAWA AMM42 identifies open circuits (e.g., broken sensor wiring) or short circuits (e.g., water ingress) and sends alert signals to the CP451-50. Operators can view fault locations directly via the CENTUM VP HMI, eliminating the need for manual sensor testing and reducing downtime. For example, in a power plant’s steam turbine system, if a pressure sensor connected to the AMM42 fails, the module immediately notifies the CP451-50, which triggers a maintenance alert and switches to a backup sensor—ensuring the processor continues to receive accurate data for turbine speed control.
Related Models
- YOKOGAWA AMM42T – Temperature-focused variant of the YOKOGAWA AMM42, optimized for RTD/thermocouple inputs (instead of 2-wire transmitters) for high-precision temperature monitoring in refineries.
- YOKOGAWA AMM42-S3 – Intrinsically safe (IS) version of the YOKOGAWA AMM42, compatible with isolation barriers for use in hazardous areas (e.g., oil & gas wellheads classified as Zone 1).
- YOKOGAWA ALP121 – Hybrid I/O module complementary to the YOKOGAWA AMM42, providing additional digital outputs for actuator control (e.g., pump on/off) when paired with the AMM42’s analog input aggregation.
- YOKOGAWA VP100 – Redundant power supply unit for the YOKOGAWA AMM42, ensuring uninterrupted operation of the module and connected transmitters during primary power failures.
- YOKOGAWA CP451-50 – CENTUM VP processor module that directly interfaces with the YOKOGAWA AMM42, using multiplexed sensor data to execute control logic for industrial processes.
- YOKOGAWA VC401-10 – Valve control module controlled by the CP451-50, adjusting process valves based on sensor data aggregated by the YOKOGAWA AMM42 (e.g., regulating flow rates in response to pressure readings).
Company & Service Highlights
Hainan Jinlin Mechanical and Electrical Equipment Co., Ltd., a distributor of industrial control products from various brands, specializes in selling industrial control products. Leveraging extensive industry knowledge and market insights, we adhere to the business philosophy of "Customer First, Striving for Progress" and prioritize customer service to provide customers with high-quality services. We are committed to serving your needs and are dedicated to meeting them!
As a certified partner of industry leaders such as Bentley Nevada, Honeywell, and Yokogawa, we provide key components for the following areas:
Typical Application Areas
- Petrochemical Industry: Aggregating pressure sensor data from 16 pipeline segments in an ethylene plant, where the YOKOGAWA AMM42 sends standardized signals to the CP451-50 processor—enabling real-time leak detection and flow rate optimization.
- Pharmaceutical Manufacturing: Multiplexing temperature and pH sensor inputs from 8 bioreactors, using the YOKOGAWA AMM42’s precision to ensure the CP451-50 maintains FDA-compliant process conditions for drug synthesis.
- Power Generation: Monitoring 12 cooling water flow sensors in a coal-fired power plant, with the YOKOGAWA AMM42 providing reliable data to the CP451-50—allowing the processor to adjust pump speeds (via VC401-10 modules) and prevent turbine overheating.
We offer a one-year warranty on all products, including the YOKOGAWA AMM42, and provide specialized pre-sales support (e.g., multiplexer channel sizing, hazardous area compatibility checks) and after-sales service (e.g., on-site module configuration, CENTUM VP integration testing). If you cannot find the model you need, please contact us immediately.
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