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If the ‘fluid_pressure’ and ‘barrel_present’ inputs are on, the system will open a flow valve for 2 seconds with output ‘flow’.
3. The ‘flow’ valve will then be turned off for 10 seconds.
4. The ‘flow’ valve will then be turned on until the ‘full’ sensor indicates the barrel is full.
5. The system will wait until the ‘barrel_present’ sensor goes off before going to the idle state.

10. Design ladder logic for an oven using process sequence bits. (Note: the solution will only be graded if the process sequence bit method is used.) The operations are as listed below.

1. Theovenbegins inanIDLE state.
2. An operator presses a start button and an ALARM output is turned on for 1 minute.
3. The ALARM output is turned off and the HEAT is turned on for 3 minutes to allow the temperature to rise to the acceptable range.
4. The CONVEYOR output is turned on.
5. If the STOP input is activated (turned off) the HEAT will be turned off, but the CONVEYOR output will be kept on for two minutes. After this the oven returns to IDLE.

plc design -10.17

1. We are developing a safety system (using a PLC-5) for a large industrial press. The press is activated by turning on the compressor power relay (R, connected to O:013/05). After R has been on for 30 seconds the press can be activated to move (P connected to O:013/06). The delay is needed for pressure to build up. After the press has been activated (with P for 1.0 seconds) the system must be shut down (R and P off), and then the cycle may begin again.

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