This article describes the Siemens s7-200 plc set and reset, the two bit operation instructions in our program, the role is very large, it can complete some of the conventional normally open normally closed contact programming can not be completed, It can make the PLC program written by us more clear and the steps easier.
Both of them are paired with 99% of each use. As long as we use set in one place in the program, reset will be used in another place in the program. So you will always be waiting for me, I will wait for you, as long as you do not come I will not be old. The general meaning of setting and resetting is that setting is to write 1 (output) to a bit and reset to write 0 (no output). The following describes the use of law.
figure 1
Figure 1, is the control circuit and program of Siemens s7200 PLC, start, maintain, and stop. We know the program on the right, it is written with simple normally open and normally closed bit manipulation instructions, and can complete self-locking. Features. If you don't understand it well, take a look at the previous section. However, in addition to the above, this self-locking function can also be accomplished using the set and reset operations we are talking about today. The procedure is as follows.
figure 2
Figure 2, the left is the use of set reset PLC program written, I feel is not more than the previously written procedures, clear and simple, the right is the set of reset instructions for each part of the decomposition instructions, has been written to understand Needless to say. If you still do not understand it, then look down, take a look at the implementation of the PLC set reset program to understand.
image 3
As shown in Figure 3, this is the set execution step of PLC resetting program:
1. When the external normally open button is not pressed, I0.0 is not turned on and the Q0.1 set coil has no output.
2. When the external normally open button is pressed, I0.0 is turned on and the Q0.1 set coil has an output.
3, when the external normally open button is released, I0.0 is disconnected and not turned on. Although I0.0 has been disconnected without connection, the Q0.1 set coil still has output, which realizes the self-locking function. It will not output until there is a reset signal, which is the characteristic of the set operation instruction.
Simple not. Then look at the reset operation.
Figure 4
As shown in Figure 4, this is the reset execution procedure of PLC resetting program:
4. When the external normally closed button is not pressed, I0.5 is not turned on and the Q0.1 reset coil has no output.
5, When the external normally closed button is pressed, I0.5 is turned on and the Q0.1 reset coil has an output. It will reset the position coil Q0.1 so that Q0.1 has no output.
6. The reset coil Q0.1 is still fixed in the reset state even if the external normally closed button release I0.5 is not turned on. Q0.1 has no output and implements a stop function.
It is also very simple. Let's take a look at Figure 5 below.
Figure 5
As shown in Figure 5, this figure illustrates the use of the PLC to set and reset operation instructions, one-time operation of multiple output bits. When the following number of set or reset operation instructions is 3, it means that when the external normally open When the button is pressed, three output points can be set once and remain until a reset signal is generated.
The above is the basic use of the PLC set and reset operation instructions.
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