If the system fails, the machine operator will not be able to switch modes, or if the machine is in automatic cycle mode, the machine operator will not be able to enter manual mode. The machine can be placed in manual mode when it receives a return home request. If no fault condition occurs, the automatic loop command in the ladder logic diagram will start the automatic loop in the automatic mode, and the loop will stop only if the automatic program is not started.
Such settings help the machine maintain its current state when a fault occurs. Some other possible settings include only allowing the machine to start the loop when it is in the home or initial position. It is also possible to hold the loop for three seconds when the button is pressed (in which case an alarm sound may be heard) or a special requirement defined by the customer.
In addition, there are some possible settings, such as the immediate stop button (even in the automatic cycle mode can stop the machine), or the memory cycle stop bit information (no need to press the button to make the loop complete).
If the system fails, the machine operator will not be able to switch modes, or if the machine is in automatic cycle mode,
The machine operator cannot enter manual mode.
A note on the last step: The first two steps use the latch or "set" bit in the automatic and manual modes. The last automatic cycle step is also latched by the "hold" contact, which has the same address as the coil. This is a commonly used technique in programmable logic controller (PLC) ladder programming and is actually only a priority.
It is also important not to start the machine immediately. Instead, the user should give a warning to the people around the machine that the device is moving. This requirement applies to most machines, except for simple machines such as test stations.
The logic can also show how the alarms use pulses to alert people that the system is going to start. A person requesting to start the machine presses a button to generate a start request signal. The next step is to start the system.
This is by no means the only way to achieve it, but it can explain the general idea clearly. There are 4 precautions that need to be focused on by the user:
1. The operator must keep pressing the cycle start button to allow the system to start. The timer will start again when you let go.
2. The system can only be started when it is in automatic mode and there is no fault.
3. If in the middle of automatic program execution, the system will not stop; this should be modified according to different situations. The program should be allowed to stop in a natural state; a specific program step or location can replace the program valid bit.
4. The fault will immediately stop the automatic cycle. Again, this does not necessarily apply to all situations.
The auto loop bit or state itself is not a true mode; it is more like a state within the auto mode. In general, it is used to allow automatic program startup or operation and is not used to disable the output signal from being energized. (Author: Frank Lamb)
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