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Chapter 6 Exercises
Exercises
Finish the evaluation of the logic in Table 6-4.
The tank is now being filled automatically from the pump. When the tank is low, the pump turns on and fills the tank. The tank is emptied as needed by the manufacturing process using the water. Design the circuit to control the pump.
Sensor
Function/State
Signal Assignment
LH
Upper Level
LL
Lower Level
Actuator
Function/State
Signal Assignment
Pump
Pump liquid in
1
Convert the following to an on-dominant seal circuit:
Convert the following seal circuit to a latch/unlatch circuit, to an S/R circuit.
Convert the following seal circuit to a latch/unlatch circuit, to an S/R circuit.
Convert problem 4 to an on-dominant circuit.
Name an action in real-life that requires the unconditional start seal circuit instead of the unconditional stop seal circuit.
Write an on-dominant seal circuit with Input1 on turning the circuit on and Input2 on turning the circuit off.
Write an off-dominant seal circuit with Input1 off turning the circuit on and Input2 on turning the circuit off.
For the Conveyor Belt System, convert to seal circuits. This is a real-world problem from Siemens’ literature in which the program is stated as a written description, I/O list and program. All that is required by this problem is to re-write the rung logic to convert the various rungs from S/R logic to seal circuits. (Ignore one-shots on Reset branch logic.)The following is from a Siemens programming text showing the use of both memory circuits (S/R) and edge trigger or one-shot logic
Convert the following to Ladder Logic. First convert to Siemens S/R logic, then A-B seal logic:
Convert the following to Ladder Logic. First convert to Siemens, then A-B.
Write the program in the PLC to turn on lights H1 and H2 to satisfy the following timing diagram. By activating switch S1, the light H1 is switched on. If S1 is activated again, a second light H2 becomes switched on. By activating S1 the next time, both lights are switched off. Use one-shot logic to complete. The pattern repeats…
Write the logic in Ladder to satisfy the following control problem. Drain Valve V1 operates independently. When the tank level reaches Low Level L0, turn on Fill Pump P1 to fill the vessel.
Write the logic in Ladder to satisfy the following control problem. Fill Valve V1 operates independently. When the tank reaches High Level L1, turn on Drain Pump P1 to empty the vessel.
Write the logic in Ladder to satisfy the following control problem:
A box is placed on the first conveyor (C1). Then the operator pulls the pull-cord and the conveyor starts if C2, the second conveyor, is also running. If not, the conveyor C1 waits until C2 starts and then turns on. The box moves on C1 until the trailing edge passes a photo-eye between the two conveyors. Then C1 stops and waits for another box. For this problem, the programmer does not contr