PLC can take both types of inputs. Logic can be written suitably with in the processor software.
Basic componets of a plc are: power supply, CPU(central prossesing unit), I/O CARDS ( INPUT/OUTPUT CARDS)
With a PLC the I/O is fixed when you buy it. Smaller stand alone units are hardwired with the exact I/O you are going to have. Even expandable configurations have a fixed input and output memory table. The PLC scans its Boolean algebra logic, constantly and sequentially, and compares that program to the I/O tables' inputs, outputs and relays. Then it makes its' decisions depending on their state.
Meaning of PLC
there r 16th types of plc ok
A functional block diagram of a programmable logic controller (PLC) typically includes several basic blocks, commonly categorized into input, output, and processing blocks. While the exact number can vary depending on the complexity of the PLC and the application, a standard PLC diagram generally features around 5 to 10 basic blocks. These blocks represent various functions such as inputs, outputs, timers, counters, and logic operations. The specific configuration may differ based on the manufacturer and the intended use of the PLC.
PLC Scan Time means plc requires some operating cycle to Plc input verification,Plc output updates and Execution of program.
Basic componets of a plc are: power supply, CPU(central prossesing unit), I/O CARDS ( INPUT/OUTPUT CARDS)
You can check the input and output in PLC by using the force command. Through the programming instrument the input can be forced opened or forced closed depending on what the status of the contacts are set to. This can also be done with the output contacts.
PLC's are used for automation of electromechanical processes, such as control of machinery on factory assembly lines, amusement rides, or light fixtures. just about anything can be controlled because PLC's use microprocessors which can be programmed for a variety of tasks.
There are PLC with fixed inputs and outputs. There are modular ones which can be added on with inputs and outputs. So number of input and output of a PLC is actually based on the type of PLC you choose. Different types are available in the market.
A Unitary PLC is a Low Cost PLC used generally in small machines as it has a very low input/output count. Still Need More Info XD
The only thing that limits the number of inputs and output instructions is the size/amount of the PLC memory.
To connect a Resistance Temperature Detector (RTD) to a Programmable Logic Controller (PLC), you typically use an RTD input module designed for the PLC. The RTD's resistance values are converted to a corresponding temperature reading by the module, which then communicates this data to the PLC. Ensure proper wiring according to the RTD type (2-wire, 3-wire, or 4-wire) and configure the PLC's software to interpret the input correctly. Calibration may also be necessary to ensure accurate temperature readings.
The coil in a "Contactor" is essentially an electromagnetic coil that provides the driving force to close the contacts in a Contactor. When the "Coil" is energized by a lower control voltage usually from some type of controller such as a PLC, the Normally-Open contactor will close or in the oposite case, the Normally-Closed contactor will open.
With a PLC the I/O is fixed when you buy it. Smaller stand alone units are hardwired with the exact I/O you are going to have. Even expandable configurations have a fixed input and output memory table. The PLC scans its Boolean algebra logic, constantly and sequentially, and compares that program to the I/O tables' inputs, outputs and relays. Then it makes its' decisions depending on their state.
I'm assuming here you are referring to a Programmable Logic Controller. PLC's must be accompanied by input sensors and output devices, so you will be limited by those as much as by the PLC. I would get together some input devices - switches, buttons, temperature switches, pressure switches, whatever your PLC will respond to, and play with those for a bit. Similarly, I would find some output devices that your PLC can turn on - relays, motors, lights, etc. and simply get the PLC to turn them on and off. Then I would just start to build up the I/O until you have rather complex logic - for example, "If I press this button AND I close that switch, the light comes on. Then, if the light is on and I press another button, the motor comes on". Playing with that will go much further in helping to learn about PLC's than starting on a specific project. If you need a project, devise some sensor that will detect a car coming into your driveway, and have the PLC turn on a fan that will ring some wind chimes.
s7-200 have 14 inputs and 10 outputs that can be relay or transistors. Check out www tmartis com for affordable plc and modules.