Description
GE Fanuc IC697CPU780
I. Basic Information
Model: IC697CPU780
Brand: GE Fanuc (Emerson)
Series: GE Series 90-70 VME Bus PLC Control SystemProduct Type: Single-slot 32-bit floating-point PLC main controller, supporting hot standby redundant architecture, which must be matched with IC697MEM735 memory daughterboard to operate normally, applied to large-scale process industrial high-reliability automatic control systems。
Product Positioning
IC697CPU780 adopts 16MHz 80386DX processor with 0.4μs Boolean instruction execution speed, supporting up to 12K discrete I/O points and 8K analog channels. It realizes bumpless hot standby switch within 20ms between master and backup CPUs to avoid production shutdown caused by single hardware failure. The user program and process data rely on IC697MEM735 memory expansion board for storage, with SRAM backed by lithium battery for up to 6-month power-off data retention, and Flash version can permanently solidify control programs to prevent program loss due to battery aging. Equipped with multi-level password authority and hardware program write protection lock, it is widely used in thermal power, petrochemical, metallurgy and other key process equipment DCS supporting PLC, ESD safety interlock systems, serving as standard replacement spare parts for old CPU renovation and redundant system upgrading projects。
Hardware Architecture
The module adopts standard VME C.1 single-slot reinforced card structure with conformal coated PCB and galvanic isolation between strong and weak current bus ports. It consists of six core functional units: 32-bit floating-point high-speed operation unit, hot standby redundant synchronization control unit, memory daughterboard expansion interface unit, RS485 communication & HMI status unit, battery-backed clock power supply unit and VME backplane bus data interaction unit. It supports local rack, remote Genius distributed I/O and multi-protocol extended networking, with multi-level surge and ESD protection to adapt to complex industrial electromagnetic interference environments。
Mounting & Supporting System
- Mounting: Standard single-slot installation for Series 90-70 VME rack, dimension: 250mm×150mm×50mm, net weight: 1.2kg
- Necessary Accessories: IC697MEM735 memory daughterboard, IC697ACC701 backup lithium battery
- Configuration Software: IC641, Proficy Machine Edition for programming, redundant configuration and fault diagnosis
- Compatible Hardware: Full range of IC697 I/O, communication and coprocessor modules
- Typical Industries: Thermal power, petrochemical, metallurgy, municipal environmental protection, cement continuous production control system.
Product Characteristics
- High-speed 32-bit floating-point computing capability supports large-scale I/O point control and complex multi-loop PID, sequential interlock and batch data processing tasks.
- Native hot standby redundant architecture realizes millisecond bumpless fault switching between master and backup controllers to ensure uninterrupted production operation.
- Dual power-off data protection of battery-backed SRAM and non-volatile Flash effectively avoids the risk of program loss caused by power failure and battery aging.
- Comprehensive hardware self-diagnosis and dual-layer authority management prevent equipment misoperation and safety accidents caused by parameter tampering.
- Flexible multi-bus distributed expansion mode adapts to centralized and wide-range remote automatic control system reconstruction and capacity expansion.
- Industrial three-proof reinforced design with EMC anti-interference performance ensures stable 24/7 long-term operation in harsh high-temperature, dusty and high-vibration industrial sites.
II. Technical Specifications
2.1 Power Supply Parameters
- Input: 5VDC VME backplane power supply, rated current 1.6A
- Backup Power: IC697ACC701 lithium battery for SRAM and system clock
- Protection: Reverse polarity, overvoltage, overcurrent, ESD and surge comprehensive hardware protection
- Dielectric Withstand Voltage: 1000VAC 1min isolation between communication ports and power ground.
2.2 Performance Parameters
- CPU: Intel 80386DX 32-bit, 16MHz, floating-point arithmetic supported
- Boolean Execution Speed: 0.4μs per instruction
- Max I/O Capacity: 12K discrete points, 8K analog channels
- Maximum redundant switch scan extension time: 20ms.
2.3 Memory & Diagnosis Parameters
- Mandatory Matching: IC697MEM735 series memory daughterboard (128KB~512KB optional, with Flash version available)
- SRAM Data Retention: Up to 6 months under new lithium battery and normal temperature
- Error Check Mode: Byte-by-byte parity check + CPU global checksum periodic scanning
- Diagnosis Items: CPU hardware fault, memory parity error, battery undervoltage, bus communication abnormality, fault code uploaded to PLC register.
2.4 Communication & Redundancy Parameters
- Onboard Port: Isolated RS485 (15Pin D-SUB) for programming and Modbus RTU communication
- Extended Communication: Ethernet, Genius field bus, various VME coprocessor modules supported
- Redundant Mode: Master-backup automatic synchronization, bumpless failover, manual switch supported
- Configuration Mode: Pure software setting without DIP switches or jumpers.
2.5 Environmental & Mechanical Parameters
- Operating Temperature: 0℃ ~ +60℃; Storage Temperature: -40℃ ~ +85℃
- Humidity: 5%~95%RH non-condensing, free of corrosive gas and conductive dust
- MTBF ≥23000h; Ingress Protection: IP20.
III. Key Features
- As the core main controller of large and medium-sized industrial control systems, it provides high-real-time computing capability for complex process interlock and closed-loop regulation.
- Hot standby redundant fault-tolerant architecture eliminates single-point hardware failure risk and guarantees continuous and stable operation of key production equipment.
- Dual-layer software and hardware protection mechanism ensures safe storage and complete traceability of user programs and key process parameters.
- Multi-dimensional fault self-diagnosis and hierarchical permission management realize equipment predictive maintenance and operational risk prevention.
- Flexible distributed bus expansion supports diversified system architecture design and later automation technical renovation.
- Millisecond timestamp event recording and fault waveform storage meet industrial safety compliance filing and accident retrospective analysis requirements.
IV. Working Principle
After power-on self-test of VME backplane, memory and hardware circuit, IC697CPU780 loads the user program from the matched memory daughterboard and executes cyclic logic scanning. It collects field I/O signals through the backplane bus, completes floating-point operation and interlock judgment, and outputs control instructions to each I/O module. Under redundant configuration, the master and backup CPUs synchronize all operation data in real time, and the backup controller automatically takes over all control tasks within 20ms once the master fails. The system monitors battery voltage, memory health and communication link status in real time, stores all operation and fault events with timestamps locally, and supports mode switching and program write protection through panel keys and lock switches.
V. Application Scenarios
- Thermal power plants: Redundant main control PLC for boiler and turbine auxiliary equipment interlock protection and continuous production monitoring.
- Petrochemical & gas industry: ESD emergency shutdown safety control system and compressor anti-surge interlock redundant PLC system.
- Metallurgy & mining industry: Centralized automatic control system for hot rolling production line, blast furnace and long-distance belt conveying equipment.
- Environmental protection & building materials industry: Whole-process automatic control and old PLC digital upgrading project for large sewage treatment and cement production lines.
- Industrial automation renovation projects: Upgrade from single CPU to hot standby redundant architecture to improve the overall reliability of the control system.
