| Rung | Logic | |------|-------| | 1 | Start AND Stop AND OL → Coil Motor (with Motor parallel contact) |
Rung1 – Auto mode:
IF (X1 OR X2) AND NOT previous THEN Lamp := NOT Lamp; END_IF; previous := X1 OR X2; Use two Set/Reset coils with interlocking. 🔹 Exercise 3 – Timer (Delayed Start) Statement: When Start is pressed, after 5 seconds motor turns ON. When Stop is pressed, motor turns OFF immediately.
---[X1]---[X2]---[Lamp]---(Lamp) ??? Not directly → use SR flip-flop Better: use a toggle logic in Structured Text (ST):
---[Start]---[Stop]---(TON_1.IN) TON_1.PT := T#5s ---[TON_1.Q]---(Motor) TON_1 starts timing when Start is pressed. Q turns ON after 5s if Start remains pressed. 🔹 Exercise 4 – Counter (Count Products) Statement: A sensor (photocell) detects products on a conveyor. Count up to 100, then stop the conveyor and reset with a button.
IF Reset_Button THEN Count := 0; Conveyor := TRUE; END_IF;
| Rung | Logic | |------|-------| | 1 | Start AND Stop AND OL → Coil Motor (with Motor parallel contact) |
Rung1 – Auto mode:
IF (X1 OR X2) AND NOT previous THEN Lamp := NOT Lamp; END_IF; previous := X1 OR X2; Use two Set/Reset coils with interlocking. 🔹 Exercise 3 – Timer (Delayed Start) Statement: When Start is pressed, after 5 seconds motor turns ON. When Stop is pressed, motor turns OFF immediately. ejercicios de plc resueltos
---[X1]---[X2]---[Lamp]---(Lamp) ??? Not directly → use SR flip-flop Better: use a toggle logic in Structured Text (ST): | Rung | Logic | |------|-------| | 1
---[Start]---[Stop]---(TON_1.IN) TON_1.PT := T#5s ---[TON_1.Q]---(Motor) TON_1 starts timing when Start is pressed. Q turns ON after 5s if Start remains pressed. 🔹 Exercise 4 – Counter (Count Products) Statement: A sensor (photocell) detects products on a conveyor. Count up to 100, then stop the conveyor and reset with a button. ---[X1]---[X2]---[Lamp]---(Lamp)
IF Reset_Button THEN Count := 0; Conveyor := TRUE; END_IF;