plc program
Basic usage of timers(1) TCDescription: X0 after 2s, Y0(2) loss delay faultFigure 3 power failure delays broken ladder diagram and sequence diagramNote: when X0 is ON, the normally open contact closure, Y0 connected and self-preservation; when X0 is off, the timer start time delay when X0 when time reaches the time timer setting is removed, … Continue reading PLC Timer Three basic usage
1. Storage capacityStorage capacity refers to the user program memory capacity. User program memory capacity, you can develop complex programs. Generally, small PLC user memory capacity for thousands of words, and mainframe user memory capacity of up to tens of thousands of words.2. I/O pointsInput/output (I/O) points is acceptable to the PLC the sum of … Continue reading PLC properties
Relays are mechanical components have life, transistors are electronic components, only the age, no usage limits. Relay switching times per minute is also limited, and transistors are not. Transistors also have high current, such as 5A above.1. the load voltage and current typeType of load: transistor can only bring a DC load, and relays with … Continue reading Difference between transistor outputs of the PLC and relay output
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 long-term engaged in the items technology work of Comrade told: ① RS485 communications short distance (800m within) of General can using no shield of General double twisted line II interference more heavy Shi can using with shield layer of double twisted line (shield layer empty hanging/or only end grounding--to and "strong electric to" … Continue reading 485 communication grounded? How should the grounding?
PLC ONE 