0 1 00:00:21,570 --> 00:00:22,170 Hello. 1 2 00:00:22,230 --> 00:00:27,240 In this video we are going to learn case loop in the ST programming language. 2 3 00:00:27,300 --> 00:00:28,650 I will create a new project 3 4 00:00:31,330 --> 00:00:39,580 and I will add new program as is the language structure text and I will say OK 4 5 00:00:43,270 --> 00:00:46,600 new program is created already we tried. 5 6 00:00:46,780 --> 00:01:00,120 If loops and we already learn if and expression and THEN and etc. elsif and also else and END_IF; 6 7 00:01:00,140 --> 00:01:00,690 -- 7 8 00:01:00,870 --> 00:01:06,450 But now we will work with the case loop or case programming. 8 9 00:01:06,450 --> 00:01:08,580 How can we use case. 9 10 00:01:08,700 --> 00:01:16,800 We will just need to put case and then we will put here word or data. 10 11 00:01:17,220 --> 00:01:20,820 So for example we can put here d0 11 12 00:01:20,850 --> 00:01:26,870 Like this case D0 of this is what we need to use. 12 13 00:01:26,940 --> 00:01:34,050 But before this ,maybe I should just click this and you can see them all in here. 13 14 00:01:34,050 --> 00:01:41,530 This is the example of the case what case is doing case F of F means you. 14 15 00:01:41,610 --> 00:01:43,200 This is the data of us. 15 16 00:01:43,440 --> 00:01:49,610 So 1 or 2 or another values in here. 16 17 00:01:49,620 --> 00:01:53,370 In the case loop for example 3 or 4 or 5. 17 18 00:01:53,370 --> 00:02:03,980 These are all coming from F and ELSE the like just a if loop in here if it is not equals to 18 19 00:02:04,020 --> 00:02:15,480 For example if f is not equal to 1 2 3 or 4 or 5 then g will be 0 then let's write our code for example 19 20 00:02:15,690 --> 00:02:34,740 if M5 then motor1 forward should be true and else motor1 forward should be false but also we need 20 21 00:02:34,740 --> 00:02:46,340 to assign our variables in here motor1 forward should be bool and this is just a variable. 21 22 00:02:46,340 --> 00:02:47,260 This okay. 22 23 00:02:47,390 --> 00:02:49,910 And what we need to put here and 23 24 00:02:53,360 --> 00:03:01,670 this moment we need to give a speed to the motor for example and then I will say motor speed 24 25 00:03:05,510 --> 00:03:14,120 equals to for example D0 thats all and in here I will say 25 26 00:03:17,630 --> 00:03:34,030 motor speed should be zero I will add here motorspeed and then it should be word than we can 26 27 00:03:34,030 --> 00:03:46,900 start case loop, case D0 of and than we can say in here we need to put for example in here to 27 28 00:03:46,920 --> 00:03:56,990 understand this example easily and professionally case D0 of I will just the selections to 28 29 00:03:56,990 --> 00:04:05,810 here one and this moment according to d0 the motor speed I will change to here a little bit 29 30 00:04:05,960 --> 00:04:06,760 later. 30 31 00:04:06,980 --> 00:04:21,270 Motor speed should be 200 and the selection is two and motor speed should be 300 and then three 31 32 00:04:22,330 --> 00:04:36,920 and the motor speed should be 400 and ELSE motor speed is going to be 0 and case that's all. 32 33 00:04:37,040 --> 00:04:45,890 So what we need if d0 is 1 the motor speed will be two hundred motor speed is going to be not adjusted 33 34 00:04:45,890 --> 00:05:00,450 in here like this and then we can say now if and 10 that's adopted a little bit more if M5 than what 34 35 00:05:00,450 --> 00:05:01,470 will happen. 35 36 00:05:01,470 --> 00:05:18,390 D 0 is going to be 1 ELSIF m4 then that moment D 0 is going to be 2 and we can say just m6 36 37 00:05:18,670 --> 00:05:29,780 Let's increase it ELSIF M7 then that moment D0 is going to be three ELSE what we gonna say 37 38 00:05:30,230 --> 00:05:33,840 D0 is going to be zero. 38 39 00:05:34,700 --> 00:05:35,350 That's okay. 39 40 00:05:35,600 --> 00:05:40,900 So what will happen if we press M5 then D0 is going to be one. 40 41 00:05:41,030 --> 00:05:49,370 And the motor speed will be two hundred if we press to M6 that moment D0 is going to be 2 and 41 42 00:05:49,370 --> 00:05:56,300 the motor speed is going to be three hundred and let's go online to plc 42 43 00:05:56,660 --> 00:05:57,640 Let's check. 43 44 00:05:57,650 --> 00:05:58,830 Will it work or not. 44 45 00:05:58,910 --> 00:06:04,550 According to our codes ,I want to do a download this codes to cpu. 45 46 00:06:04,550 --> 00:06:08,980 And now it's transferring and I want to go back to running state. 46 47 00:06:08,980 --> 00:06:10,400 Let's start it. 47 48 00:06:10,400 --> 00:06:15,770 Firstly I will just make it bigger for you. 48 49 00:06:15,770 --> 00:06:24,250 I guess this is okay and then M5 is on now M5 is on and D 0 equals to 1. 49 50 00:06:24,500 --> 00:06:26,930 And the motor speed is 200. 50 51 00:06:26,960 --> 00:06:38,030 You can see it and then let's say M7 is going to be on and then motor speed is 400 because now we are 51 52 00:06:38,030 --> 00:06:48,710 writing 3 to D0 set off and M6 and now you can see it is 2 and because of 2 equals to 300 and m6 52 53 00:06:48,730 --> 00:06:52,800 set off that moment motor speed is 0. 53 54 00:06:53,060 --> 00:07:03,680 So also in the st operators lesson than you can remember or already we just check. 54 55 00:07:03,750 --> 00:07:17,770 We can use if M5 and not m6 and not m7 we can use it like this. 55 56 00:07:17,770 --> 00:07:22,820 So it is normally open contact normally close and normally close. 56 57 00:07:22,900 --> 00:07:33,510 Also we can say or not M7 for example we can adopt this if loop in here and according to if loop we 57 58 00:07:33,510 --> 00:07:36,220 can adapt our case loop in here. 58 59 00:07:36,270 --> 00:07:43,140 So what we need we need just one data in the case of between the case and OF we need to put here data 59 60 00:07:43,170 --> 00:07:44,440 according to this data. 60 61 00:07:44,550 --> 00:07:52,920 We can just adopt 1 2 and 3 to dot in here and then we have our variable and we are assigning value 61 62 00:07:52,920 --> 00:07:57,700 to our variable and after ELSE we are just writing okay. 62 63 00:07:57,740 --> 00:08:00,360 This is in the case loop everything is wrong. 63 64 00:08:00,360 --> 00:08:02,660 So just you need to use this. 64 65 00:08:02,760 --> 00:08:08,800 And after else we are just putting it to here we have our variable and according to else 65 66 00:08:08,820 --> 00:08:15,550 Loop in the case loop we are just writing 0 or true or etc. This is up to you. 66 67 00:08:15,570 --> 00:08:17,970 So this is how can we use case. 67 68 00:08:17,970 --> 00:08:26,400 So when we came here just click case and you will see the structure of the case and after case 68 69 00:08:26,400 --> 00:08:29,310 loop is when you make it like this. 69 70 00:08:29,320 --> 00:08:37,510 A basic examples you can add and not, or , or not , or and just M6 like this and M7 70 71 00:08:37,680 --> 00:08:45,420 This is just 3 serial contact normally open contact in the if loop that you can do a little bit more 71 72 00:08:46,260 --> 00:08:54,150 advanced examples with yourself and if you stuck any point or any time you should just inform 72 73 00:08:54,150 --> 00:09:01,100 me I am going to help you whatever I can and we can fix your problems or solve problems everytime. 73 74 00:09:02,250 --> 00:09:05,070 You should know you need to keep follow and keep learning. 74 75 00:09:05,090 --> 00:09:07,030 I'm finished sorry for this video. 75 76 00:09:07,110 --> 00:09:08,640 See you in the next video.