Description

Yokogawa AMN21 Relay I/O Module Nest

The Yokogawa AMN21 nest, also cataloged as the AMN21 Relay I/O Module Nest, operates as a dedicated hardware component for relay signal switching within CENTUM CS1000, CS3000, and CENTUM VP control platforms. It provides structured electrical and mechanical support for multiple relay I/O modules, ensuring isolated channel-to-channel signal operation.

HardwareSpecifications

Parameter	Specification
ModelBrand	Yokogawa AMN21
Origin	Japan
Weight	2.0 kg (without modules)
Dimensions	Standard Yokogawa relay nest size
OperatingTemp	-10 degC to 60 degC
StorageTemp	-20 degC to 70 degC
Humidity	10% to 90% RH, non-condensing
PowerConsumption	24 VDC / 110 VAC / 220 VAC
RelayCapacity	2 A @ 250 V AC / 30 V DC per relay
SystemCompatibility	CENTUM CS1000, CS3000, CENTUM VP
ModuleSupport	Standard Yokogawa Relay I/O Modules
MountingOptions	19-inch rack or cabinet mount
MaterialBuild	Industrial-grade plastic and anti-corrosive metal alloy
Certifications	CE, RoHS

ProcessControlTechnicalFeatures

• Channel-to-Channel Isolation: Electrical separation ensures minimal cross-talk between adjacent relay modules, protecting signal integrity in complex I/O configurations.
• 4-20 mA HART Loop Protocol Compatibility: Supports interfacing with analog transmitters for process control feedback and monitoring.
• Cold Junction Compensation (CJc): Maintains accurate relay actuation in environments with fluctuating cabinet temperatures.

FrequentlyAskedQuestions

Q: VnA: Can modules be hot-swapped while the AMN21 is powered?
A: Hot-swapping is not recommended; modules should only be inserted or removed with power removed to avoid backplane voltage transients.

Q: VnA: What is the typical relay switching delay?
A: Switching delay is primarily determined by the relay coil response, typically in the millisecond range per module datasheet.

Q: VnA: Does the AMN21 support both AC and DC relay loads simultaneously?
A: Yes, provided each relay channel is connected within its rated voltage and current specification limits.

FieldInstallationGuidelines

• Mount the AMN21 in a stable rack or cabinet, ensuring at least 50 mm clearance for airflow.
• Connect power supply lines to the appropriate 24 VDC or AC terminals, observing polarity.
• Ensure shielded wiring for field inputs and outputs is properly grounded to reduce EMI.
• Protect empty slots with dummy covers to prevent dust and humidity ingress.
• Route signal wiring separately from high-current power lines to maintain channel isolation.

Specifications

• Brand: Yokogawa

Advantages

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