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Yokogawa ASD143-P00 Analog Input Module

The Yokogawa ASD143-P00, also cataloged as the ASD143 Analog Input Module, operates as a dedicated hardware component for 4-20 mA signal acquisition within CENTUM CS 3000 and CENTUM VP systems. It converts field current inputs into digital data for process control execution and supports dual-redundant configurations for continuous loop operation.

Hardware Specifications

Parameter	Specification
Model Brand	Yokogawa
Origin	Japan
Module Type	Analog Input Module (Current Input)
Number of Channels	16 isolated
Input Signal Range	4-20 mA DC
Input Impedance	Approx. 250 Ω
A/D Conversion Resolution	16-bit
Accuracy	±0.1% full scale
System Side Isolation	Optocoupler isolation (Field-to-System)
Withstand Voltage	1500 V AC between field terminals and system
Configuration	Dual-redundant capable
Maximum Current Consumption	Dependent on system rack configuration
Weight	0.3-0.4 kg (depending on housing)
Dimensions	Standard DCS module form factor
Operating Temp	0 to 60 degC
Storage Temp	-20 to 85 degC
Power Consumption	5 V DC system power typical

Process Control Features

• 4-20 mA HART Loop Compatibility: Supports analog input from transmitters with standard 4-20 mA current signals and can carry HART communication signals without interruption.
• Channel-to-Channel Isolation: Each input channel is electrically isolated to prevent cross-talk and ground loops between field devices and system bus.
• Cold Junction Compensation (CJC): Integrated temperature sensing for compensation ensures accurate signal conversion from transmitters sensitive to ambient temperature variations.

Frequently Asked Questions

Q: What is the maximum hot-swap duration for this module?
A: The ASD143-P00 can be replaced online while maintaining loop integrity; switching time is governed by DCS redundant logic but typically completes without process interruption.

Q: How is galvanic isolation implemented on this module?
A: Field-to-system isolation is achieved via optocouplers on each channel to suppress surges and prevent signal interference between channels.

Q: Can firmware updates be applied without system shutdown?
A: Firmware maintenance requires system-level coordination; the module supports redundant operation, but hot firmware flash must follow Yokogawa CS/VP guidelines.

Field Installation Guidelines

• Mount module according to rack alignment; ensure correct slot insertion to maintain redundant bus continuity.
• Connect input wiring to terminals with shielded twisted pairs; terminate shields at single-point ground near the rack.
• Avoid routing high-power AC lines or heavy motor wiring adjacent to signal cables to minimize EMI.
• Ensure proper airflow in the cabinet; maintain ambient temperatures within 0-60 degC.
• Verify isolation gaps and field voltage limits before energizing; the module withstands 1500 V AC between field and system.

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