وصف

Yokogawa F3AD08-5R Analog Input Module

The Yokogawa F3AD08-5R, also cataloged as the F3AD08-5R Analog Input Module, operates as a dedicated hardware component for high-speed A/D signal acquisition within FA-M3 PLC platforms.

Hardware Specifications

Parameter	Specification
ModelBrand	Yokogawa F3AD08-5R
Origin	Japan
Weight	Approx. 200 g
Dimensions	28.9 W x 100 H x 106.1 D mm
OperatingTemp	0 to 55 degC, 10% to 90% RH, non-condensing
PowerConsumption	210 mA @ 5 V DC
Number of Inputs	8 differential channels
Supported Voltage Ranges	0-5 V DC, 1-5 V DC, 0-10 V DC, -10 to 10 V DC (Default: -10 to 10 V DC)
Supported Current Ranges	0-20 mA DC, 4-20 mA DC
Absolute Maximum Rating	±18 V DC (Voltage), 25 mA DC (Current)
Input Resistance	≥1 MΩ for voltage, 250 Ω for current
Allowable Common-Mode Voltage	±1 V DC (-10 to 10 V, 0-10 V); ±6 V DC (0-5 V, 1-5 V, current ranges)
A/D Conversion Resolution	16-bit
Maximum Resolution	Voltage: 0.4 mV; Current: 1.6 μA
Conversion Cycle Options	50 μs, 100 μs, 250 μs, 500 μs, 1 ms, 16.6 ms, 20 ms, 100 ms
Overall Accuracy	±0.1% FS at 23 ±2 degC; ±0.2% FS at 0-55 degC
Scaling Capability	Digital range -30,000 to +30,000
Isolation Method	Photocoupler isolation (between input terminals and system circuit)
Withstanding Voltage	500 V DC for 1 min
External Connection	18-point removable terminal block, M3.5 screws

Process Control Specific Features

This module supports channel-to-channel isolation to prevent cross-interference between measurement lines. It is compatible with 4-20 mA HART loop protocol and allows integration with FOUNDATION Fieldbus and Profibus PA networks. Cold junction compensation (CJC) is internally implemented for thermocouple signal stabilization, minimizing temperature-induced drift across analog channels.

Frequently Asked Questions

Q: Can the F3AD08-5R module operate in hot-swap conditions?
A: No, the module must be powered down before installation or removal to prevent signal disruption and potential backplane faults.

Q: What is the impact of using the 50 μs conversion cycle on filtering?
A: Digital filters (first-order lag or moving average) are bypassed during 50 μs conversion cycles; filtering is available only at cycles ≥100 μs.

Q: How should differential signals be wired to minimize noise?
A: Connect differential pairs twisted and shielded; ground shielding at a single point. Avoid routing parallel to high-current power cables.

Field Installation Guidelines

• Ensure the module is securely mounted on the FA-M3 backplane and properly seated in the connector.
• Maintain at least 5 mm clearance from high-voltage power lines to prevent capacitive coupling.
• Terminate analog signal shields at a single point to avoid ground loops.
• Observe correct polarity for voltage and current inputs; over-voltage beyond ratings may damage the module.
• For multi-channel wiring, keep twisted pairs consistent and minimize length differences between positive and negative lines to preserve measurement accuracy.

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