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Course Content


A PLC Signal Flow Diagram is a graphical representation of the logic and the sequence of a programmable logic controller (PLC). It helps to identify the different functions, inputs, outputs, and other parameters.

PLC is a type of programmable logic controller that is widely used in industrial automation. It has a central processor and a number of input/output modules. The input modules are connected to the bus, and each module can be programmed by the central processor to control a particular function. The output modules are connected to the bus, and they can be programmed by the central processor to control other functions.

Advantages of using a PLC signal flow diagram in automation:

  • It helps you to troubleshoot problems in your automation system.
  • It provides a clear overview of the current state of your automation system, which will help you to make decisions faster.

The diagram is typically created using a computer software program to represent the PLC's I/O devices and the inputs that are received by these devices. The software then generates a sequence of control signals for each device, which are then passed to the PLC via its input/output ports. These control signals can be used by other software programs to simulate or emulate the process being controlled by the PLC.

The steps in creating a PLC signal flow diagram are:

  • Identify all the control devices such as actuators, valves, sensors, etc.
  • Identify all the inputs and outputs of these devices
  • Determine which devices depend on which other devices for their function
  • Determine which devices are used for controlling other devices
  • Determine how much each device affects others
  • Establish a time sequence for each device's operation

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