plc program
INV (Inverse) instruction in the ladder diagram with a 45 ° short slashes to represent, it will perform the calculation result be negated before the instruction, and the result is 0 it becomes 1, and the result was 1 becomes 0. In the following diagram, if X0 and X1 both ON, Y0 is OFF; otherwise, … Continue reading Reverse, Non processing and END PLC instructions
NOP instruction for no operation, mainly used for short circuit, change the circuit functions and procedures to use when debugging.Added to the program after no operation, no effect on the results of logical operations, but when the program is changed in the future, replaced by other directives no operation, can reduce the program changes.If no … Continue reading PLC instructions NOP
1. no operation (NOP)NOP: no operationNOP instruction is typically used for the following aspects: Specifies a certain sequence content is empty, blank for use; some short circuit the contacts or circuit, as shown in Figure 7.24 (a), (b) shown cut off some of the circuit, as shown in Figure 7.24 (c), (d) shown in transform … Continue reading PLC no operation (NOP), program end (END) command
You what kind of touch screen and PLC, because each brand of touch screen and PLC connector wiring and communication methods are not the same, you get their wiring diagrams and PLC downloading programs, touch-screen computers configured, when creating a new project, will let you choose what to connect plc, what type, and then select … Continue reading Link between touch screen and PLC
According to the modular design, modules control functions of the system, in order for the control module design of ladder diagram.For example, in the PC control system of Elevator, the elevator control functions can be divided into: door switch control modules, layer control module, the elevator control module, such as call display and control module. … Continue reading Design method of PLC ladder diagram module
Beginners PLC ladder diagram programming, should follow certain rules, and to develop good habits. Following is a brief overview of PLC ladder diagram programming you need to follow the rules.Trapezoidal steps are started in the bus left and finally the right bus (usually saves not painting, painted bus left only). Is a combination of contacts … Continue reading How to learn PLC ladder diagram programming
PLC ONE 