YOKOGAWA AAM21 CENTUM VP 16-Channel Analog Input Module

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YOKOGAWA AAM21 Analog Input Module Configured for high-density analog signal acquisition in CENTUM VP and CS distributed control systems, the...

SKU: AAM21

Manufacturer: Yokogawa
Product No.: AAM21
Product Type: Analog Input Modules
Product Origin: Japan
Payment:T/T, Western Union
Weight: 100g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

YOKOGAWA AAM21 Analog Input Module

Configured for high-density analog signal acquisition in CENTUM VP and CS distributed control systems, the YOKOGAWA AAM21 (AAM21 Analog Input Module) provides direct electrical conversion and digitization of 4-20 mA DC current loops for process monitoring.

Hardware Specifications

Parameter	Specification
Model	AAM21
Brand	YOKOGAWA
Origin	Japan
Weight	0.1 kg
Dimensions	7.6 cm x 0.0 cm x 17.8 cm
Operating Temp	-10 deg C to +55 deg C
Power Consumption	400 mA @ 5 VDC
Input Channels	16
Input Resistance	250 Ohm
Accuracy	+/- 0.1% FS (typical)

Process Control and Galvanic Isolation

The AAM21 incorporates a 12-bit analog-to-digital converter to process input signals with a 100 ms update period. To protect internal control circuitry from field-side transients, the module features 1500 VAC/min galvanic isolation between the system bus and the I/O interface. This architectural design effectively minimizes common-mode noise propagation, ensuring stable loop readings in complex electromagnetic environments.

Frequently Asked Questions

Q: Does the AAM21 support hot-swapping within the I/O rack?

A: The module supports live insertion and removal within designated CENTUM I/O nests. Prior to extraction, ensure that the host controller is notified or the loop is placed in a maintenance state to prevent spurious process alarms caused by the sudden loss of the 4-20 mA current loop.

Q: How is burn-out detection configured for specific field instruments?

A: Burn-out detection is set via the system engineering software. Technicians may configure the module to report an upscale or downscale signal upon the detection of an open-circuit loop, allowing the controller to distinguish between a zero-flow process state and a failed sensor connection.

Field Installation Guidelines

Mounting: Ensure the module is fully seated into the backplane connector. Verify that the mechanical locking tabs are secure to maintain consistent electrical contact between the 5 VDC power pins and the module power bus.
Shielding: Terminate cable shields at the cabinet entry point using a low-impedance ground bus. Prevent ground loops by ensuring that only one end of the cable shield is referenced to the earth ground, particularly when transmitters are powered by independent supplies.
Wiring: Maintain proper signal polarity throughout the 4-20 mA loop. Given the 250 Ohm input resistance, ensure that the cumulative loop resistance does not exceed the drive capability of the field transmitter, which could otherwise cause signal saturation or measurement inaccuracies.

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