Timer is equivalent to relay time relay in the circuit may delay control in your program. FX2 series programmable controller has the following four types of timer.
100ms timer: T0~T199 200 timing ranges: 0.1~3276.7 s
T200~T245 46 10ms timer timing range: 0.01~327.67 s
1ms totalizer timers T246~T249 4 (interrupt) time range 0.001~32.767 s
100ms totalizer timer T250~T255 6 timer range 0.1~3276.7s
Timer programmable controller based on cumulative timing clock pulse, clock pulse 1ms, 10ms, 100ms in different specifications. (Process timer job is actually the clock pulse counts) because of work, outside of own numbered memory, timer, also played a set value registers (Word), a current values of registers (Word). Setting register (Word) store when programming timings set value of an assignment. Current values of registers recording timer to the current value. These registers as a 16-bit binary storage. The maximum value multiplied by the time timer value is the maximum timed range of timer values. The timer starts timing conditions are met, current values of registers is counted when the timer actions when the current value is equal to the set value, normally open contacts connected normally closed contacts disconnect, and procedures used to control the object, achieve the purpose of time control.
Figure 6 timer used in the ladder diagram. Figure 6 (a) as a normal non-totalizing timer. Figure 6 (b) integrating the timer. Figure 6 (a) in the X1 time condition, when X1 is switched on t-10 times of the timer begins. K20 as the set value. Decimal number “20“ for the timer time unit values of multiples. T 10 to 100ms timer, when set value is “K20“, its time time of 2s. Y10 for timer objects in the picture. When time is up, timer t 10 normally open connecting, Y10 set to 1. T10 is the non-accumulation-type timer. At the beginning of its time and not when the set value is reached, disconnect timing conditions X1 or PLC power power failure, time to abort and the current values of registers reset (set to 0). Disconnect if X1 or PLC power power failure occurs in the timing process is complete and the contact of the timer action, contact action cannot be maintained.
T 10 timer replace timer T250 product formula, the situation is different. Plot formula of timer in timed conditions or PLC lost lose the power, the current values of registers contents and contact status can be maintained, “cumulative“ timings. So called “accumulation“. Figure 6 (b) ladder diagram for timer t 250 product formula work. Timer product formula current values of registers and contact with memory function, you must join in a program dedicated to reset reset instructions. X2 is a reset condition. When X2 connected to perform “RST T250“ instruction, t 250 the current values of registers and contacts at the same time set to 0.
Figure 6 timer using
Timer you can use the number k as the set value at once, such as in Figure 3-5 “K20“ and “K345“, also can be used after the data content of the register as a set value. Set timer value is “D10“ and “D10“ content is 100, the timer value is 100. When using the data set timer value registers. General use has the power to keep the data register. Even so, if battery voltage decreases, the timer may malfunction.
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