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English英语译成Chinese汉语: Understanding the Controller, Chassis, and I/O Modules for a XXX System General field: 技术/工程设计
原文文本 - English英语 Understanding the Controller, Chassis, and I/O Modules for a XXX System
Control hardware includes a Chassis (Rack), Power Supply, 1757-PLX52 Control Processor, XXX Interface, Redundancy Module, and I/O Modules. An optional Battery Extension Module (not shown) is also available. The Chassis is available in 5 sizes - 4, 7, 10, 13, and 17 slots.
1 The Power Supply is separate from the Rack and does not consume any slots. It is mounted on the left end of the Rack. Both 120/240 VAC and 24 VDC supplies are available.
2 The 1757-PLX52 Process Control Module is a double wide, two-board assembly featuring a 100 MHz PowerPC processor and eight (8) Mbytes of RAM with error detection and correction. It supports both non-redundant and redundant controller configurations. Four (4) Mbytes of parity-protected Flash ROM is used for permanent program storage and allows easy upgrades. A built-in lithium battery backs up the controller database, and an optional two-slot wide Battery Extension Module provides a rechargeable option instead of replacing the lithium battery.
The Process Controller architecture, featuring the 1757-PLX52 Control Processor, handles a wide variety of requirements, including continuous processes, batch processes, discrete operations, and machine control needs. Compact and cost-effective, the 1757-PLX52 is ideal for integrated regulatory, fast logic, sequential, and batch control applications. Control functions are provided through a library of templates called Function Blocks (FBs). Strategies are easily built using a state-of-the-art graphical engineering tool called Control Builder. Once built, control strategies can be loaded and monitored using Control Builder.
The Control Execution Environment (CEE) is the execution and scheduling environment for the 1757-PLX52 Control Processor. It is available in two base execution rates, 50 msec (normal) and 5 msec (fast) and is selected and loaded into the processor with Control Builder, so you can select the execution speed at development time.
CEE is the underlying support layer for the execution of all control functions. It features:
• Individual per-module selectable execution rates of 50, 100, 200, 500, 1000 and 2000 msec for the 50 msec CEE and 5, 10, 20, 50, 100 and 200 ms for the 5 msec CEE.
• Configurable phase assignment of any modules executing slower than the base rate. This provides the ability to “load balance” a Control Processor.
• Peer-to-peer communication between 1757-PLX52 Control Processors (PLX555 and other Legacy PLC’s, such as PLC5). Implementation is transparent so that peer-to-peer connections are configured in the same way as intra-controller connections.
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加入会员日期： Dec '14
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