MOTOROLA FLN4234A CPU3680 VME Bus Industrial CPU Processor Module

FLN4234A CPU3680 is a Motorola original VME bus single-board industrial CPU module, widely matched with FOXBORO I/A Series DCS rack control systems. Equipped with a 32-bit high-speed RISC processor and VxWorks real-time operating system, it undertakes core real-time logic computing, field signal data processing and multi-channel bus communication scheduling tasks for large-scale process control racks. The whole PCB adopts industrial conformal coating to resist dust, humidity and strong electromagnetic interference in power and chemical control cabinets.

This plug-in rack CPU integrates independent Ethernet, serial and CAN communication interfaces, with large-capacity RAM and Flash storage for offline program backup and long-term operation data logging. It supports redundant hot standby operation to avoid single-point failure shutdown of production lines. Now out of original production, it is a key aftermarket spare part for overhaul and replacement of aging FOXBORO DCS and VME industrial control equipment.

Main Specifications

• Brand: MOTOROLA; Model: FLN4234A; Type Code: CPU3680; Architecture: VME Bus Single Board CPU
• Core Processor: 32-bit RISC high-speed real-time processor, running VxWorks RTOS
• Onboard Memory: 128MB RAM + 16MB Flash for control program & historical data storage
• Communication Interfaces: Dual Ethernet, RS232/485 Serial, CAN bus, VME backplane bus
• Power Supply: 24VDC cabinet backplane power supply, low power consumption stable operation
• Environmental Range: -40℃ ~ +70℃ operating temp, humidity 5%~95% non-condensing
• Mechanical Standard: Standard VME rack plug-in structure, shock & vibration industrial certification
• Diagnosis Design: Front panel LED indicators for power, running status, communication and hardware faults
• Matching Hardware: FOXBORO FBMSSW communication switch, CV3 series I/O modules, I/A Series workstation

Core Functions

• Execute full set of industrial control logic including PID closed-loop regulation, equipment interlock protection, sequence startup/shutdown and mass real-time process data calculation.
• Act as core VME bus master controller, bidirectionally transmit measurement signals and control commands between rack I/O modules and upper monitoring workstations.
• Multi-protocol communication support realizes data interconnection with DCS operation stations, local HMI panels and third-party auxiliary control devices via Ethernet and serial ports.
• Redundant hot standby architecture supports seamless automatic switch between primary and backup CPU, eliminating system control interruption caused by single board failure.
• Built-in comprehensive self-test circuit records complete fault logs, uploading CPU overload, bus disconnection and hardware abnormality alarms to upper monitoring system for troubleshooting.
• Standard VME rack unified pin definition supports direct ｄｒｏｐ-in replacement without modifying cabinet wiring or DCS control configuration parameters during on-site maintenance.

Application Scenarios

• Core CPU spare replacement for FOXBORO I/A Series DCS control racks in thermal power plants and hydropower stations.
• VME bus main processing spare parts for petrochemical refineries, natural gas plants and pulp & paper mill legacy distributed automation systems.
• Maintenance backup inventory for metallurgical rolling mills, cement kilns and industrial self-owned power station process control cabinets.
• Matching main processor cooperating with FOXBORO FBMSSW redundant communication switch and CV3 analog/digital I/O cards.
• Retrofit spare components for aging VME industrial control systems with communication breakdown and logic operation lag faults.

• Global aftermarket spare stock for process industry maintenance workshops maintaining vintage Motorola & FOXBORO DCS hardware.