In today's competitive market environment, process industries demand a totally integrated control and optimization solution that can increase productivity, reliability, and quality while minimizing cost. The automation users are constantly searching for solutions to improve their competitive edge and to enhance their return on investment.

The Nexus control system is designed to meet these customers' needs by delivering operating efficiency improvement, productivity gain, and unit reliability and availability enhancement, while providing overall cost reduction during the lifecycle of the plant.

The distributed architecture of the Nexus Control System provides users with flexible system configuration, meeting the requirements for system layout in different applications while ensuring system reliability. The component design and network redundancy guarantees the operability of critical systems and control functions in response to single or even multiple points of failure.

Control system failures can result in personal injury, loss of production and equipment damage. This makes system reliability an extremely important consideration when choosing a control system. Nexus has been optimized and engineered with special attention to system diagnostic an redundancy features, which have proven to increase system availability. In addition, Nexus can provide users with remote diagnostic service. The Unit Data Highway (UDH) allows control data, process information, operator and engineering stations, and gateway functions to be fully shared on a common network. The UDH network is a redundant industrial Ethernet, and uses a separate, high speed serial iLink IO network to collect plant information. Each controller in the system is dual redundant and normally segregated by process function, but closely integrated with its peers in terms of data sharing. The architecture distributes risk so the failure of any single component does not affect the rest of the system. For example, if a single controller fails, operation in other areas of the plant will not be impacted. The distributed architecture also gives users greater flexibility in system installation and space utilization. Having the flexibility to distribute control, I/O, and HMI functions to different areas of the plant allows users to reduce the length of cable runs, minimize the footprint of electronics rooms and cut down capital cost.

▶ iDPU Controller Features
• Dual 24V DC input
• Altera SoC 800MHz dual-core 64-bit embedded processor
• Onboard DRAM memory: 512MB
• Onboard flash memory:256MB
• 5 x Giga-bit Ethernets
• 4 x iLink interfaces for IO modules
• Support up to 56 IO modules
• QNX® multitasking RTOS
• Cycle time: 20ms
• NTP synchronize accuracy: ±1ms
• Working temperature: 0~60℃ (Fanless)

▶ Environment
• Working temperature:0℃~ +60℃
• Storage temperature:-40℃~ +85℃
• Humidity:5 ~ 95% Relative(Non-condensing)

▶ Powerful Computing Platform
• Real-time response,fastest control loop response time (input to output) <50ms
• Algorithm configuration up to 2000 pages, up to 512 function blocks on each page
• 1ms resolution of SOE (Sequence of Event) record

▶ Higher Availability with Fault-Tolerance Technology
• Redundant communication between controller and IO modules
• Redundant controller configuration with instant switch-over
• No performance degrade at any single-point failure situation

▶ Fully-covered Industrial IO Types
Most of the applications could be fulfilled by general IO modules (AI, AO, DI, DO, TC/RTD) with simplified IO design and reduced spare parts. The scalable system design can fit any applications with different scope.

▶ Rugged IO with Distributed Installation
The feature of distributed installation bring customer great feasibility to install the IO modules inside or outside the room, individually or in group. Field installation with equipment would save lots of cables and installation cost.
Compact and low power consumption design make the IO module more reliable working in the harsh environment with shock/vibration and pollution.

▶ Higher availability with Fault-tolerant Technology
Redundancy is the basic concept in the system design including controller, communication and power supply. The system can work normally without any performances degrade at any single point failure situation.

▶ Reduced Maintenance Cost
High diagnostic coverage helps customer to quickly identify any defect or potential failure and fix it to minimize un-planned outage. Hot-Swap capability helps customer to conduct online replacement.

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