The usual method is to use heartbeat, defined a bool, HMI fixed point set the frequency, PLC receives the point after ON signal is reset. If a period of time, for example, do not receive the points for the ON signal within 5s, it is considered Tongxu interrupted.plc to the memory clock of bytes transmitted … Continue reading Through the program determines the touch screen and plc communication failure method
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sample PLC circuit diagram
PLC circuit diagram
PLC conduction delay timer instruction (TON)
When the limit switch 1 is set, the indicator 2 ON 180ms (timer clocked). When the accumulated value of the timer 1 (.ACC) reaches 180, 2 lights off, the indicator 3 is turned on, and remains on until the TON instruction is disabled. If you disconnect the timer is timing the limit switch 1, then … Continue reading PLC conduction delay timer instruction (TON)
PLC program sequential logic design method
(1) overview Sequential logic design method is suitable for the output signals of the status change of the PLC has some chronological situation, when in programming according to draw sequence diagram of the output signal, streamlining the state transitions and transition conditions, examine the output and input and internal contacts and the relationship, and make the … Continue reading PLC program sequential logic design method
PLC program Transplantation Design Method Programming steps
(1) the analysis of the existing system worksUnderstand the process of the controlled device and mechanical functioning, according to relay diagram analysis and principle of master control system. (2) PLC I/O distributionDetermine the system's input and output devices, the PLC I/O allocation, draw the PLC wiring diagram. (3) correspond to the establishment of other componentsOK relay diagram … Continue reading PLC program Transplantation Design Method Programming steps
PLC program Transplantation design
Replace the relay control is the trend of PLC control, if the relay control system with PLC transformation, under the original relay diagram to design of ladder diagram is clearly a shortcut. This is due to original of following electrical control system after long-term of using and test, has was proved can completed system requirements … Continue reading PLC program Transplantation design
Failure analysis of job insecurity diesel generator starting
After the diesel generator starting job insecurity Failure Analysis:After cranking speed diesel generator fluctuated, usually because the fuel adjustment system failure caused.Failure reason:1 each cylinder diesel generator work poor, leading to deflationary pressures are not the same for each cylinder.2 fuel supply system with air, water or poor oil supply.Associated with each cylinder plunger large … Continue reading Failure analysis of job insecurity diesel generator starting
How to calculate 7.5kw motor rated current
7.5KW three-phase motors (Y2 series) Rated current: 14.9 An (2-pole), 15.6 Ann (4-pole), 17.2 Ann (6-pole), 17.8 Ann (8-pole). No-load current is about 30 to 50% of the rated current.Calculation method:P = 0.85 * 1.732UI = 0.85 * 1.732 * 380 * II = 13.4 over the algorithm 7.5kw three-phase asynchronous motors. 0.85 power factor.
The most simple and safest delta voltage starting circuit diagram
circuit diagram
What is the difference between circuit and magnetic circuit
What is a circuit?EMF (voltage) under the path of the currents flowing through the circuit. Usually consists of a power supply, load and switch it into three parts. The magnitude and direction of the current flowing through the circuit the circuit does not change with time, called the DC circuit. The magnitude and direction of … Continue reading What is the difference between circuit and magnetic circuit
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