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Originally released in , this book has been a consistent bestseller among programmers, as well as a university coursebook. For purposes of this manual, I have placed additional explanations between rungs. Use a title to name the program and include any general information. This type of bit is what we call an internal coil. It has no hardwired connection to the outside world.
If the emergency stop is clear, and the machine guard is in place, and there is no system fault the operator may press the start button to set the latch. Most of the time, the order of the bits in a rung doesn't matter. We could have rearranged any of the bits in this rung, though we would still have to put the latch around the Start pushbutton. The PLC wouldn't care and the output coil would still respond the same. However, to make the rung easier to read, I try to place bits from left to right in order of importance.
If the E-Stop is not cleared, then nothing else should matter anyway. Having the safety guard in place is more important than a system fault.
Now, if those requirements have been met, we can press the start button. And we don't care about the stop button until we have pushed the start button. Note the instruction used for the input of PB3, the Stop System bit. It may seem backwards at first, since a hard-wired circuit would use the normally closed contacts of the switch. The E-Stop and the guard limit switch are called "safety interlocks.
Use additional contacts from the switches and wire them to inputs of the PLC so that it knows the machine is to be stopped, or has stopped.
It is very important to label the bits properly. Arrange the verbs and nouns correctly. If you do, the rung will read like a sentence. There are some simple rules that I always follow when I am writing a description for a bit: - Descriptions for bits portray an action.
We can then place just that bit in the rung that controls the spindle motor and know that we have met all the criteria to allow the spindle motor to run. The idea is to turn on all the pilot lights for a couple of seconds so you can verify that all the lights work. This feature is very handy when you are troubleshooting a machine.
When the Emergency stop is first cleared, Timer 0 is started. The result is that all the pilot lights will turn on for two seconds after the E-Stop is cleared. This bit is then used throughout the program. You want to enable certain machine functions in Auto Mode, and disable some in Manual Mode, and vice versa. Notice how the System Running bit is used. If we lose that bit, such as when the emergency stop is pressed or the machine guard is opened, neither mode is valid.
A manual mode is provided to allow ease of set-up. These photoeyes are positioned so that if they "see" a part, they will turn on the input. A part will break the beam, the input will turn on and you know you have a part present. In this rung, we want to make sure there is no part in the machine. The rung will only be true if all the photoeyes indicate there is not a part present. This is standard on most machines. When the operator goes to Auto Mode, and there are no parts in the machine, and the machine components are at home, the cycle will begin.
You might ask, "If there is a part in the press, wouldn't the machine start running as soon as the operator took the part out?
You don't want this machine to start running when someone clears a part. In our case, to remove a part the operator would have to open the machine guard door in order to physically remove the part, and that would kick the machine out of automatic mode.
He would have to close the guard and start the machine again. Bit coil22 will stay on during the entire drilling cycle and drop out when an end of cycle signal is generated.
Note that the PLC will stop the conveyor after the part has been clamped in place Rung 16 , but until that happens, the conveyor will run. This reference book offers practical advice about everything, from estimating and coding to refactoring and testing.
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