Method analysis of normally open and normally closed conversion solutions

Recently, some customers have received such a project:

Application environment: bank cash machine

Achieve the purpose: There is a door outside the cash machine. The normal door needs to be in the [normally open] state. When the person enters, the induction probe senses that the back door of the person is in the "locked" state. When the person leaves the sensing range of the sensing probe, the door Switch to the normally open state.

We know that when the door is in the [normally closed] state, whether it is a card or button or other way, the door cannot be switched to the closed state. At this time, you must enter the software main console, the right mouse button, and the door control mode is switched to In the online or normally closed state, the door can be closed! Obviously this way is not advisable!

Remember the question I had about the internal and external checksum and interlocking functions conflicts in the previous issue? At this time, is there a small partner who has already thought of a solution? Yes, plus fire linkage expansion board to achieve linkage signal to close the door!

Normally open to normally closed method Solution:

Add an expansion board;

The No. 1 output port of the expansion board corresponds to the No. 1 door of the controller, and is used as a linkage signal. The wiring method is as follows:

Management software setting method:

No. 1 expansion port setting method [The expansion port of the No. 1 expansion port is configured to force the door lock event to trigger, the relay keeps the action and the trigger source consistently]:

The infrared probe is mentioned in the customer's demand. The state of the door is locked by induction. How should it be wired? All the micro-farming controllers have endpoints that reserve a forced lock (the controllers of different series models may be different at this point, you can find them by finding the J9/FL logo, for example, the example below), and the controller is "online". Underneath, only need to short-circuit these two points to achieve the forced lock door. Because the controller is in the "normally open" state, it is impossible to lock the door even if it is short-circuited. The function of using this forced lock door is mainly to trigger the fire. The relay output of the expansion board is linked to achieve the purpose of locking the door. The wiring diagram is as follows:

Normally closed to normally open method

The above is the method of normally opening and closing normally closed. How to set the wiring when the normally closed switching normally open method is used? The method of normally closed switching normally open and the method of normally open switching normally closed are only the same as the wiring, as shown in the following figure:

I have explained the alternative solution to this problem through a case. In any case, as long as the problem can be solved, everyone can also divert their own thinking and think about other feasible methods. The method is not necessarily unique. Everyone has a better idea and can also leave a message with Xiaobian, everyone to discuss and discuss!