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PLC controller inputs An automated system depends to a large extent on the ability of a PLC controller to read signals from different types of sensors and input devices. To detect a work piece, see a mechanism in motion, check the pressure…
Sinking and Sourcing: PLC has input and output lines through which it connects to a directing system. The inputs can be keys, switches, sensors, while the outputs are directed to different devices, from simple signalling lights to complex communication modules. This is…
The latching is used where the output must be activated even after the entry ceases. A simple example of such a situation is a motor, which is started by pressing a button switch. Although the switch contacts do not remain closed, it…
What is program scan and Scan time? A PLC operates by executing programs in PLC memory repeatedly. The instructions contained in the program are executed sequentially from beginning to end and continuously, and when the last instruction is executed, the operation will return and…
The use of relay instructions is to regulate and control the status of bits in a data table, such as input bits or bit words for timer controls. These instructions are: XIC controls the bit for the ON condition XIO controls the…
PLC is a control system that is compatible with many control system designs in today’s industries, which are not only output models but can accommodate more complex control systems. PLC is a solid-state component that is designed to replace conventional relay functions…
PLC Ladder motor Problem: Controlling the running state of the 1 ph motor by PLC ; pressing START and STOP pushbuttons i.e. motor should remain in ON state after START pushbutton is pressed and should OFF when STOP pushbutton is pressed. Checking…
Introduction The majorities of the instructions take two input values, perform the specified arithmetic function, and output the result to an assigned memory location. For example, both the ADD and SUB instructions take a pair of input values, add or subtract them,…
Introduction This session contains general information about the data handling instructions for plc and explains how they function in your application program. Convert to BCD (TOD) Use this instruction to convert 16-bit integers into BCD values. If the integer value you enter…
Introduction Comparison instructions in PLC are used to test pairs of values to condition the logical continuity of a rung. As an example, suppose a LES instruction is presented with two values. If the first value is less than the second, then…
