Mitsubishi series PLCFX timer to delay timer, its working principle is that the timer after electrify, coil start delay, pending the time to contact action;
When the power by the coil in timer, timer contact instantly reset.
but in practice, we often encounter such as time delay, time limit control, power control requirements such as long time delay, which can be realized through programming.
1, the current time delay control as shown in figure 3 - delay on control procedures
Its implementation, is the control function of the X1 through to 5, after, Y0 is output.
principle analysis is as follows: when the X1 is 0 n status, M0 auxiliary relay coil connected, the normally open contact closure self-locking, can keep the timer T0 coil electricity state.
T0 coil on 5 s, the current value and the setting of the T0 equal T0 the normally open contact closure, relay output Y0 coil connected.
when the X2 is ON state, M0 auxiliary relay coil disconnection, T0 timer is reset, T0 normally open contacts disconnect, make the output relay Y0 coil disconnection.
2, power off time delay control delay as shown in figure 3 - disconnect control procedures
Its implementation, is the control function of the input signal is disconnected after l0s, output to stop work.
principle analysis is as follows: when the X0 is ON state, M0 auxiliary relay coil connected, the normally open contact closure, output relay coil through to Y3.
But the coil electricity (T0 timer
Because the front (
Is disconnected state)
when X0 changed from ON to OFF, (
In a connected state, T0 timer start timing.
After l0s, T0 the normally closed contact of open, M0 coil losing electricity, the output relay Y0 disconnect.
3, time limit control in actual engineering, often encounter will load control work within the time limit within the prescribed time.
This can be achieved by as shown in figure 3 -
29 program to implement, it is the control function of the implementation, control the load of maximum working hours for l0s.
as shown in figure 3 -
30 program can realize control load at least work time.
The program implementation, is the control function of the output signal of Y2 minimum working time for 10 s.
4, long time delay control program in the PLC controller
, timer timing time is limited, the maximum is 3276.
7 s, less than lh.
In order to get a longer time, can use two or more than two cascade realization, timer or the timer and counter, can also be done by counter is used with the clock pulse.
Timer timer cascade use cascade, when using the sum of the total time for each timer setting time.
Figure 3 -
31 is to use two timer 1.
5 h of timing, time to time, Y0 electricity.
Combinations of timers and counters figure 3 -
32 is completed with a timer and a counter 1 h time.
when the X0, M0 and self-locking, T0 timer rely on reset itself to create a cycle of 100 s pulse sequence, as a counter C0 count pulse.
After the counter plan with 36 pulse, it normally open contact closure, make the output Y0 through.
From X0 to Y0 through to connect, the delay time of 100 s x 36 = 3600 s, which is 1 h.
Two counter combined figure 3 -
33 is to use two counter complete 1 h time.
The clock pulse) 1 s
As the count pulse counter C0.
Timing starts when the X0, counter C0.
60 meter with pulse (
, the normally open contact C0 to counter C1 a count pulse, at the same time to reset the counter C0.
counters C1 on c0 pulse count, when 60 meter with pulse, C1 normally open contact closure, make the output Y0 through.
From X0 to Y0 through to connect, regular time for 60 x 60 s = 3600 s, which is 1 h.
5, on total time PLC
control program running total time control circuit can pass M8000, M8013 and counter combination, prepare the second, minute, when, days, years of display circuit.
Here, you need to use the power to keep the counter (
C100 ~ C199)
, which ensures that every boot of the cumulative time to time, as shown in figure 3 -
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