SR and RS function blocks
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With the block using EN gate, the circuit operates normally as above if EN=ON; but when EN=OFF, the output (d) remains in the previous state.
b). RS(_E) block has Reset priority.
This block has similar operating characteristics to the SR(_E) block above, however here the priority belongs to gate (s2).
- When (s1) is ON, (d) is turned on (Set), if (s2) is ON, (d) will be turned off (Reset),
- If (ss) is ON while s(1) is still ON, (d) cannot be turned ON (still reset).
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The function of the EN gate is similar to that of the SR(_E) block.
c). Rising edge detection block R_TRIG(_E). This block detects the presence of the input signal (s1) and outputs (d) a pulse lasting one scan cycle.
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In case of using EN gate, the effect of this gate is shown in the following timing diagram.
d). Falling edge detection block F_TRIG(_E). Works exactly like the rising edge detection block but emits a pulse with a length of one scan cycle when detecting the loss of the existing signal (s).