Yokogawa F3BU09-0N FA-M3 9-Slot Base Unit
The Yokogawa F3BU09-0N, also cataloged as the F3BU09-0N 9-Slot Base Unit, operates as a dedicated hardware component for structural mounting and backplane bus interconnection within Yokogawa FA-M3 PLC platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | F3BU09-0N |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.29 kg (0.64 lbs) |
| Dimensions | 350 x 120 x 30 mm |
| Operating Temp | -20 to +55 deg C |
| Power Consumption | 50 mA at 5 VDC (backplane bus load) |
| Available Slots | 9 module slots |
| Bus Interface | FA-M3 high-speed system bus |
| Mounting Method | DIN-rail or panel mounting |
| Cooling | Natural convection |
Channel-to-Channel Isolation & Cold Junction Compensation Compatibility
The base unit routes system power and high-speed data bus traffic across 9 dedicated expansion slots without introducing signal crosstalk. Standard power distribution buses route regulated DC supply to installed CPU, digital, and analog I/O modules. While handling analog input modules with channel-to-channel isolation and thermocouple inputs with cold junction compensation (CJC), the backplane architecture maintains ground isolation between field signals and internal processing logic. This structural separation suppresses common-mode noise and prevents ground loop currents across connected field loops.
Frequently Asked Questions
Q: What is the backplane power current draw for the F3BU09-0N base unit?
A: The unit draws a nominal 50 mA at 5 VDC from the system backplane power supply to operate internal bus interface logic.
Q: What module types can be installed into the 9 available slots?
A: The unit accepts FA-M3 CPU processors, power supply modules, digital I/O, analog I/O, and specialized communication modules across all standard positions.
Q: How is the base unit cooled during continuous industrial operation?
A: Cooling relies entirely on natural convection. The physical layout requires unblocked vertical clearance above and below the chassis for passive airflow.
Field Installation Guidelines
Mount the base unit onto a standard 35 mm DIN rail or secure it directly to a flat enclosure panel using mounting screws. Ensure the enclosure maintains adequate vertical spacing above and below the assembly to allow unrestricted natural convection cooling. Align each FA-M3 module with the guide channels before applying firm pressure to seat the backplane connector.
Connect the primary enclosure earth ground to the dedicated base ground terminal using a low-impedance copper conductor. Keep high-voltage field wiring physically separated from low-voltage DC signals and backplane communication paths to eliminate inductive coupling. Furthermore, confirm that all expansion modules seat fully and lock into position prior to applying system power.
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