وصف

Yokogawa AAB841-S00 Analog Input Module

Configured for analog signal acquisition in CENTUM VP and CENTUM CS 3000 distributed control systems, the Yokogawa AAB841-S00 (AAB841 Analog Input Module) provides direct electrical interfacing between field instrumentation and control processors via 4–20 mA and 1–5 V DC input channels.

Hardware Specifications

Parameter	Specification
Model Brand	Yokogawa AAB841-S00
Origin	Japan
Weight	0.35 kg
Dimensions	12.5 cm x 10.5 cm x 3.5 cm
Operating Temp	0 to 55 degC
Power Consumption	Max. 300 mA @ 5 VDC
Number of Channels	8, isolated
Input Signals	4–20 mA DC, 1–5 V DC
Input Impedance	250 ohm (current), ≥1 Mohm (voltage)
Withstanding Voltage	1500 V AC (signal–system), 500 V AC (channel–channel)
Accuracy	±0.1% of full scale
Data Refresh Cycle	100 ms
Connection Type	Pressure clamp terminal or dedicated cable

Channel-to-Channel Isolation Characteristics

Channel-to-channel isolation eliminates ground loops and suppresses common-mode noise between input circuits. Each channel employs independent signal conditioning paths referenced to isolated internal potential planes. Isolation withstand ratings are maintained per Yokogawa FCS design standards to prevent cross-circuit fault propagation during transient overvoltage events.

Frequently Asked Questions

Q: Does the AAB841-S00 support hot-swapping?

A: Yes, when installed in a dual-redundant I/O node configuration, the module can be replaced online without interrupting control execution.

Q: What is the backplane current load for this module?

A: Maximum backplane current draw is 300 mA at 5 VDC system power.

Q: Are input channels galvanically isolated from the system bus?

A: Yes, the module provides 1500 V AC isolation between input signals and the system side.

Field Installation Guidelines

Mount the module in designated I/O slot positions within the Yokogawa FCS or node unit. Use shielded twisted-pair cabling for all analog input wiring. Connect shield drains to the common ground bus at the cabinet entry point only. Ensure torque specifications on pressure clamp terminals meet Yokogawa-recommended values (typically 0.5 N·m). Verify input polarity before applying power. Perform gap voltage checks after installation to confirm correct signal referencing.

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