PLC system consists of various sections, each designed for certain functions: like CPU, Input module, output module, communication bus, memory, power supply.
CPU
There are two types of PLC systems used in industry: fixed and modular. CPU unit of PLC system is built into a single-piece unit in fixed PLC. While in modular PLC’s, the CPU is a plug-in module. CPU functions same as brain functions in human body. CPU has a microprocessor integrated chip which is placed on a PCB with associated interface chips.
Microprocessor which is the brain of a PLC system supervises all functions in a PLC System. CPU reads position/ information of input devices and stores this information in the memory for later use. Then it executes the user program and then updates the output devices / field hardware devices.
PLC Memory System
This is as storage for the user program. The input status file consists of memory location and stores the status of each field input device. The output status file consists of memory locations and stores the status of field hardware devices after the user program is executed. The output module is a kind of switching device for each output point. The data storage area of memory is used to store numerical/math calculation related data.
PLC I/O Module
There are two types of real world input and output devices: Discrete and analog. Discrete devices are either ON or OFF type. Limit switches, push button, pilot lamps, solenoids etc. are the examples of discrete input devices. Analog devices cater to a continuously varying quantity between minimum to maximum such as temperature, Pressure, level, flow etc.
PLC INPUT MODULES
Input modules in a PLC system serve as the link between field devices and the PLC CPU. Input modules have a terminal blocks for attaching input wiring from each individual field input device. The function of an input module is to read input signals, convert it to a signal level CPU can understand and send the signal, back to the CPU. Each input terminal on each input module has one memory location in the input status file. Which stores the binary equivalent of the ON or OFF status either 0 or 1.
PLC OUTPUT MODULES
Output Modules in PLC system serve as the link between the PLC¢s microprocessor and field devices. PLC output module has a terminals for attaching output devices. Generally output modules have 8, 16, 32, 64 output terminals.
Remote PLC I/O Racks
Generally PLC input and output modules are installed closer to the actual operating equipment. Which saves lot of cable and other associated wiring/ labor cost. PLC output modules have status lights which shortens troubleshooting time and increases production, eases maintenance and efficiency of the system.
PLC Training, PLC SCADA Training courses by Sofcon India Pvt Ltd greatly help budding engineers understand practical application of automation system.
FIXED AND MODULAR PLC HARDWARE
PLC hardware falls into two physical configurations
Fixed PLC: A fixed PLC system has all of its components positioned in single unit.. This style of PLC system is also called a packaged controller.
Modular PLC:-The modular PLC system comes as modular pieces.
CPU
There are two types of PLC systems used in industry: fixed and modular. CPU unit of PLC system is built into a single-piece unit in fixed PLC. While in modular PLC’s, the CPU is a plug-in module. CPU functions same as brain functions in human body. CPU has a microprocessor integrated chip which is placed on a PCB with associated interface chips.
Microprocessor which is the brain of a PLC system supervises all functions in a PLC System. CPU reads position/ information of input devices and stores this information in the memory for later use. Then it executes the user program and then updates the output devices / field hardware devices.
PLC Memory System
This is as storage for the user program. The input status file consists of memory location and stores the status of each field input device. The output status file consists of memory locations and stores the status of field hardware devices after the user program is executed. The output module is a kind of switching device for each output point. The data storage area of memory is used to store numerical/math calculation related data.
PLC I/O Module
There are two types of real world input and output devices: Discrete and analog. Discrete devices are either ON or OFF type. Limit switches, push button, pilot lamps, solenoids etc. are the examples of discrete input devices. Analog devices cater to a continuously varying quantity between minimum to maximum such as temperature, Pressure, level, flow etc.
PLC INPUT MODULES
Input modules in a PLC system serve as the link between field devices and the PLC CPU. Input modules have a terminal blocks for attaching input wiring from each individual field input device. The function of an input module is to read input signals, convert it to a signal level CPU can understand and send the signal, back to the CPU. Each input terminal on each input module has one memory location in the input status file. Which stores the binary equivalent of the ON or OFF status either 0 or 1.
PLC OUTPUT MODULES
Output Modules in PLC system serve as the link between the PLC¢s microprocessor and field devices. PLC output module has a terminals for attaching output devices. Generally output modules have 8, 16, 32, 64 output terminals.
Remote PLC I/O Racks
Generally PLC input and output modules are installed closer to the actual operating equipment. Which saves lot of cable and other associated wiring/ labor cost. PLC output modules have status lights which shortens troubleshooting time and increases production, eases maintenance and efficiency of the system.
PLC Training, PLC SCADA Training courses by Sofcon India Pvt Ltd greatly help budding engineers understand practical application of automation system.
FIXED AND MODULAR PLC HARDWARE
PLC hardware falls into two physical configurations
Fixed PLC: A fixed PLC system has all of its components positioned in single unit.. This style of PLC system is also called a packaged controller.
Modular PLC:-The modular PLC system comes as modular pieces.
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