1 Basic Principles of PLC Ladder Diagram Network: A complete block network is composed of devices and all kinds of blocks. The blocks or devices connectable by a vertical line or continuous line belong to the same network. Network 1 An independent network Network 2 An incomplete network 1.4 How to Edit a PLC Ladder Diagram The editing of the program should start from the left power line and ends at the right power line, a row after another. The drawing of the right power line will be omitted if edited from WPLSoft. A row can have maximum 11 contacts on it. If 11 is not enough, you can continuously connect more devices and the continuous number will be generated automatically.
The same input points can be used repeatedly. See the figure below: X0 X1 X2 X3 X4 X5 X6 X7 X10 C0 C1 00000 00000 Y0 X11 X12 X13 Continuous number The operation of the ladder diagram program is scanning from top left to bottom right. The coil and the operation frame of the application instruction belong to the output side in the program and are placed in the right if the ladder diagram. Take the figure below for example, we will step by step explain the process of a ladder diagram. The numbers in the black circles indicate the order. DVP-PLC Application Manual 1-8 X0 X1 Y1 X4 Y1 M0 T0 M3 TMR T0 K10 X3 M1 TMR T0 K10