Model Interpretation

5501: Woodward MicroNet series plug-in CPU & communication board unified base code;

470: Standard main CPU version with dual Ethernet + isolated multi-serial port configuration, full onboard memory and complete system operating firmware, primary master controller of standard MicroNet chassis, contrasted with auxiliary serial communication slave module 5501-471.

Technical Specifications

Electrical & Mechanical Parameter

Power Input: Powered via chassis backplane bus 24VDC(18~32VDC), typical power consumption 9.5W

Working Ambient: Operating temp -40℃~+70℃, storage -40℃~+85℃, 5%~95%RH non-condensing, anti-vibration compliant for ship & field skid-mounted unit

Dimension: Standard 6U rack card 312×158×33mm, net weight≈950g, metal shielding housing, front panel industrial grade protection

Certification: UL/cUL, CE, SIL2 safety certification, Class I Div.2 hazardous area approval

Hardware Configuration: 32-bit industrial core processor, onboard built-in system flash & data storage memory, real-time clock for fault event timestamp recording

Internal Resource Allocation

Built-in independent logic arithmetic unit, supports up to 32 sets independent PID closed-loop control, capable of speed/load/pressure cascade compound control; backplane high-speed bus for real-time data exchange with all DI/DO/AI/AO & SIO modules in rack.

Interface and Communication Configuration

Front Panel Interfaces

1×Isolated RS232 debug port: local parameter download/upload, field handheld commissioning connection

Dual independent 100Mbps Ethernet ports: redundant Modbus-TCP/EtherNet/IP for DCS upper system communication, redundant network backup

LED Indicators: Power, CPU Run, System Fault, Network Com Alarm four status indicator lamps

Rear Side: Gold finger backplane connector, docking MicroNet rack internal high-speed backplane bus

Core Function

Master logic computing: Execute all unit speed governing, extraction pressure control, protection interlock logic, replace discrete PLC function inside turbine control cabinet.

Full I/O centralized management: Collect all field analog/digital signals from rack expansion I/O modules, compute and output valve control commands to actuator drive modules.

Redundant network communication: Dual Ethernet redundant networking improves communication reliability, upload real-time operating parameters to plant DCS, receive remote setpoint instructions reversely.

Historical fault recording: Automatically store unit trip records, module fault codes, alarm events for post-failure troubleshooting check via commissioning software.

Multi-unit parallel load sharing: Support multi-CPU module networking to realize genset parallel synchronization and active power load distribution for multiple generating units.

Applicable Scenarios

Gas/steam turbine generator set control cabinet, petrochemical large compressor drive turbine control rack, waste heat power plant turbine control system, offshore platform & ship main engine genset MicroNet control system, matched with Woodward ProTech overspeed protection device and 505 series digital governor.

Operation and Maintenance Instructions

Install at fixed CPU slot of MicroNet standard rack, avoid adjacent to high-power contactor and frequency converter to prevent EMI causing CPU crash or communication loss.

Periodically blow dust on front panel ports and backplane gold finger with dry compressed air every 12 months to avoid poor contact failure.

Before replacement of 5501-470, back up complete system parameter program via front RS232 port; after new module installation, download backup program and complete cold start commissioning.

Abnormal communication troubleshooting: First inspect rack 24VDC power supply stability, then verify Ethernet wiring sequence and DCS upper computer IP address matching setting.