The customer requested to detect the time from when the relay was energized to closing, and specially called the customer service call to the technical support department of Haiwell to consult the solution. According to customer requirements, we know that the relay pull-in action generally goes through the following processes:
Among them, T1 and T2 are electrical actions, and the time is negligible; T4 and T5 are mechanical actions, the coil must overcome the spring force, and finally we find the time T:
From a theoretical analysis, the pull-in time of about 10ms for the relay is relatively fast, and the ordinary relay will reach tens of milliseconds. But if based on the calculation formula, we can neither provide an accurate measurement of the distance before the contact nor know the action speed of the relay in a short time, then, do we have no way to measure it? Of course not, the following is the solution.
solution:
The pull-in time of the relay is fast. If a general timer is used to calculate the pull-in time, the error is relatively large. Haiwell PLC provides a 16us system clock, which is the system register SV49SV50, which automatically adds 1 every 16us register.
To solve the problem of high-precision timing, we also need to have fast response capabilities. Haiwell's full range of PLC switch input X0-X7 provides rising and falling edge capture interrupts respectively. The interrupts are not affected by the PLC scan cycle and can achieve fast response.
Hardware wiring:
According to customer requirements and solutions, we simply draw the wiring diagram as follows:
We use the Y0 output of the PLC to drive the relay coil KM0, and at the same time connect the Y0 output signal to X0, trigger the X0 rising edge interrupt, and record the time of SV49SV50 at this time. When the relay is closed, the normally open contact becomes normally closed. At this time, the X1 rising edge interrupt is triggered. Record the time of SV49SV50 at this time in the interrupt program. Subtract the time of SV49SV50 recorded twice to get the time from power-on to pull-in of the relay. Finally, take this The time interval in units of 16us, converted into milliseconds, can get the closed high-precision time value.
Programming:
First, check the edge interrupt in the hardware configuration of Haiwell PLC programming software, as shown in the following figure:
Main program: bind interrupts, and do multiple measurement data records
X0 rising edge interrupt program:
X1 rising edge interrupt program:
Measured with Haiwell H series mainframe, the time interval of relay pull-in is as follows (2 groups of 30 times):
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