The numbers of input relays and output relays are composed of fixed numbers held by the base unit and numbers assigned according to the order in which expansion devices are connected. Since these numbers are in octal, there are no values of "8" or "9".
Input and output relay number
Terminal name and wiring diagram
Input X
Output Y
In the input terminal X wiring, there is only one S/S for the common end of all Xs, but the common port com port of the output terminal is different. The specific allocation is shown in the figure below.
Output terminal Y and com port
Let's take a simple example to illustrate the solution of input and output ports.
Initial state
S/S is connected to the internal 24V DC power supply of PLC , and the input signals X0 and X1 are connected to 0V through buttons, the red button is X1, and X0 is the green button.
The red button is for starting input. Click to input X0, and the output Y0 is equal and self-locking.
Input X0
Output Y0 and self-lock
Input X1 output Y0 contact self-locking.
Y0 light off
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