7MH4950-1AA01 SIEMENS

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7MH4950-1AA01  What parts of the PLC are made up of?

The hardware of PLC is generally composed of host computer, I/O expansion machine and external equipment.

(1) The host includes: a microprocessor (MPU). Commonly used microprocessors are: Z80A, 8085, M6800, M6809, 8086, M68000. The microcontrollers are: 8039, 8031, M6801.

Memory: PLC memory is used to store programs and data, generally using ROM or EPROM.

I/O interface: The I/O interface is the connection part between the host and external devices, I/O modules, etc. It is used to expand the input and output points of the driving capability of the PLC bus.

(2) Power supply: The voltage range is 160VAC-260VAC.

(3) Input/output module: used for conditioning input and output signals, filtering, isolating, level shifting, etc. input signals. Including DC switch quantity input module, AC switch quantity input module, DC switch quantity output module, AC switch quantity output module.

(4) Functional modules: including A/D module and D/A module, temperature sensor module, high-speed counting module, PID module, remote I/O module, communication module.

(5) Expansion port

(6) Programmer

(7) Other peripherals: printers, monitors.


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