DVP-ES3 Series Programming Manual 2.2.4 Input Relays (X) Input function The input is connected to the input device (external devices such as button switches, rotary switches, and number and the ON/OFF state of the input varies with the ON/OFF state of the input device. switches), and the PLC reads the input signal. You can use input contact A or contact B several times in the program, _2 Input number (the octal number) For the PLC, the input numbers start from X0. The number of inputs varies with the number of inputs on the digital input/output modules. The inputs are numbered according to the order in which the digital input/output modules are connected to the CPU module.
The maximum number of inputs for the PLC is 256, and the input number range is between X0 to X377. Input type Inputs are classified into two types. 1. Regenerated inputs: The PLC reads the state of a regenerated input before the program is executed; for example, LD X0. 2. Direct input: The state of a direct input is read by the PLC during the execution of the instructions; for example, LD DX0. 2.2.5 Output Relays (Y) Output function The output sends the ON/OFF signal to drive the load connected to the output, such as an external signal lamp, a digital display, or an electromagnetic valve. There are four types of outputs.
They are relays, transistors (NPN and PNP), and TRIACs (thyristors). You can use the output contact A or contact B several times in the program. Use output Y only once in the program; otherwise, according the PLC’s program-scanning function, the state of the output depends on the circuit connected to the last output Y in the program. Output number (the octal number) input/output modules. The outputs are numbered according to the order in which the digital input/output modules are For the PLC, the output numbers start from Y0. The number of outputs varies with the number of outputs on the digital connected to the PLC.
The maximum number of outputs on the PLC is 256, and the range is between Y0 and Y377. An output that is not used as an output device can be used as a general device. Output types Outputs are classified into two types. 1. Regenerated output: The state of a regenerated output is not written until the program executes the END instruction, according to the states of the outputs; for example, OUT Y0. 2. Direct output: The state of a direct output is written by the PLC during the execution of the instructions, according to the states of the outputs; for example, OUT DY0. 2-10