Siemens plc rack slot
S Automation System, Hardware and Installation: CPU IFM Arranging modules on a single rack Slot-defined addressing of modules. Siemens 8-Slot I/O Rack. Make sure the item is the correct one, and it will work for your particular application. Exceptions can be made at our discretion. Thanks to numerous interfaces every SIMATIC Rack PC can be quickly and flexibly extended. Sophisticated innovative industrial design and integrated diagnostics and message functions make the Siemens rack computers highly available and particularly easy to maintain.
SIMATIC Rack PC – high-performance industrial PCs and industrial servers
The CPU has different operating modes. Examples of analog devices are pressure transducers, flow meters and thermocouples for temperature readings Outputs Output devices can also consist of digital or analog types. The rack is the component that holds everything together. Typical outputs signals can range from VDC or mA and are used to drive mass flow controllers, pressure regulators and position controls. The components that make a PLC work can be divided into three core areas.
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Request new password How PLCs Work A programmable logic controller is a specialized computer used to control machines and processes. It therefore shares common terms with typical PCs like central processing unit, memory, software and communications. Unlike a personal computer though the PLC is designed to survive in a rugged industrial atmosphere and to be very flexible in how it interfaces with inputs and outputs to the real world. The components that make a PLC work can be divided into three core areas.
They can be so small as to fit in your shirt pocket while more involved controls systems require large PLC racks. The rack is the component that holds everything together. Depending on the needs of the control system it can be ordered in different sizes to hold more modules. Like a human spine the rack has a backplane at the rear which allows the cards to communicate with the CPU. The power supply plugs into the rack as well and supplies a regulated DC power to other modules that plug into the rack.
This module typically lives in the slot beside the power supply. Manufacturers offer different types of CPUs based on the complexity needed for the system. The CPU consists of a microprocessor, memory chip and other integrated circuits to control logic, monitoring and communications.
The CPU has different operating modes. In programming mode it accepts the downloaded logic from a PC. The CPU is then placed in run mode so that it can execute the program and operate the process. Since a PLC is a dedicated controller it will only process this one program over and over again. One cycle through the program is called a scan time and involves reading the inputs from the other modules, executing the logic based on these inputs and then updated the outputs accordingly.
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