0 1 00:00:21,460 --> 00:00:22,300 Hello. 1 2 00:00:22,380 --> 00:00:24,660 In this video we are going to learn. 2 3 00:00:24,660 --> 00:00:25,180 common 3 4 00:00:25,170 --> 00:00:31,710 special contacts, we need to learn this contacts before to write 4 5 00:00:31,720 --> 00:00:39,430 plc programs because we are going to really need these contacts in our plc projects. 5 6 00:00:39,550 --> 00:00:42,400 when plc is run situation. 6 7 00:00:42,550 --> 00:00:55,030 You can see in here M1000 ,1001 1002 1003 auxiliary relays and these contacts are special 7 8 00:00:55,090 --> 00:00:57,310 M contacts are working. 8 9 00:00:57,310 --> 00:00:58,330 But how. 9 10 00:00:58,420 --> 00:01:06,620 M one thousand contact is means a contact constantly on during operation and detection. 10 11 00:01:06,730 --> 00:01:16,690 When plc is in run status m1000 remains M1001 B contact is constantly off during 11 12 00:01:16,690 --> 00:01:18,270 operation and detection. 12 13 00:01:18,340 --> 00:01:28,030 When plc is in run status M1001 remains off M1002 is on during the first scan when the plc starts 13 14 00:01:28,030 --> 00:01:35,620 to run and remains off afterwards, the pulse width is equals to one scan time. 14 15 00:01:35,620 --> 00:01:41,900 So use this contact for all kinds of initial settings like communications settings like before to 15 16 00:01:41,930 --> 00:01:50,410 start up the while starting up project or starting up plc you can use this contact just once to 16 17 00:01:50,410 --> 00:01:59,410 write some variables to your data registers and M1003 is off during the first scan then plc starts to 17 18 00:01:59,410 --> 00:02:06,530 run and remains on afterward and M1003 enables negative direction. 18 19 00:02:06,580 --> 00:02:17,140 So for m1011,12 and 13 and 14 for the time to adapt our time to 19 20 00:02:17,440 --> 00:02:27,180 give a pulses and also activate some contacts always with the sequentially or time by time to activate 20 21 00:02:27,460 --> 00:02:37,930 we can use this contact M1011 is five millisecond on five milliseconds off M1012 50 21 22 00:02:37,990 --> 00:02:49,790 milliseconds on and 50 milliseconds off M1013 500 milliseconds on 500 milliseconds off M1040 in 30 22 23 00:02:49,900 --> 00:02:52,440 seconds on 30 second off. 23 24 00:02:52,780 --> 00:02:53,560 Let's take a look. 24 25 00:02:53,560 --> 00:02:57,670 These M contacts with an example. 25 26 00:02:57,670 --> 00:03:03,940 So let's create a new project and give a name to this project 26 27 00:03:06,740 --> 00:03:17,270 M contacts our controller type is going to be DVP and the plc type can be SS2 a new program. 27 28 00:03:17,270 --> 00:03:17,860 Okay. 28 29 00:03:17,900 --> 00:03:20,330 Cyclic task can be ladder diagram. 29 30 00:03:20,450 --> 00:03:33,980 Okay creat project and let's write ld m1000 and also I want to create an another network. 30 31 00:03:34,460 --> 00:03:35,650 Okay. 31 32 00:03:35,840 --> 00:03:45,840 LD M1001 ,LD M1002 32 33 00:03:48,730 --> 00:03:52,500 LD M1003 33 34 00:03:57,310 --> 00:04:00,900 LD M1011 34 35 00:04:05,200 --> 00:04:14,980 LD M1012 and one more network LD M1013 35 36 00:04:18,080 --> 00:04:23,190 LD M1014 36 37 00:04:23,350 --> 00:04:33,820 So what we are going to expect from these networks M1000 will always on this is put in here to 37 38 00:04:33,910 --> 00:04:40,780 outputs and what will happen let's watch them all. 38 39 00:04:40,780 --> 00:04:43,720 Or let's monitor them all altogether. 39 40 00:04:43,720 --> 00:04:46,990 So I will just give out y0. 40 41 00:04:47,240 --> 00:05:05,350 I will say to set them all and set y1 , set y2 , set y3 41 42 00:05:08,320 --> 00:05:10,600 set y4 42 43 00:05:13,690 --> 00:05:15,130 also I will. 43 44 00:05:15,550 --> 00:05:22,760 I'm not going to use this in here I will say increöemt D0 44 45 00:05:25,230 --> 00:05:35,370 increment D1 we will learn increment or decrement command in the next videos but I 45 46 00:05:35,370 --> 00:05:45,300 will just give an example to in here increment D2 increment D3 and open our simulator and project 46 47 00:05:45,300 --> 00:05:53,730 is going to be compiled and yes transfer our program or project to Plc and now it's transferring and 47 48 00:05:53,940 --> 00:05:57,100 go back to running state and on. 48 49 00:05:57,870 --> 00:06:08,850 So now look M1000 directly set , this is M1002 just giving it just a single positive pulse when 49 50 00:06:08,850 --> 00:06:10,410 the plc is run. 50 51 00:06:10,410 --> 00:06:19,830 Now you can see it is off but output is high and M1003 giving negative pulse at the moment when 51 52 00:06:19,830 --> 00:06:21,110 run is active. 52 53 00:06:21,210 --> 00:06:30,000 So it is always active too and it it's also giving to output to our coil and it is set 53 54 00:06:30,090 --> 00:06:39,570 And look our values it is giving a 10 millisecond clock pulse five milliseconds high five 54 55 00:06:39,570 --> 00:06:50,700 milliseconds of and this is fifty millisecond high and 50 milliseconds of and this is 500 milliseconds 55 56 00:06:50,790 --> 00:07:03,690 on 500 millisecond off and you see this is our value and one minute is 30 second on 30 second off 56 57 00:07:04,230 --> 00:07:12,270 and it is giving a pulse while this value is increasing because 30 second this is activated so it is 57 58 00:07:12,570 --> 00:07:17,240 incrementing always and third second it is incrementing. 58 59 00:07:17,430 --> 00:07:25,290 And now you can see the values are changing and these special contacts are giving an output according 59 60 00:07:25,290 --> 00:07:27,700 to their special settings. 60 61 00:07:27,900 --> 00:07:30,320 And in here you can see it. 61 62 00:07:30,320 --> 00:07:39,880 Y1 is said not set because M1001 is b contact and normally close contact. 62 63 00:07:39,920 --> 00:07:46,330 So let is make this off, set off then this will be always off. 63 64 00:07:46,340 --> 00:07:48,420 It is not possible to get this. 64 65 00:07:48,560 --> 00:07:53,910 Y0 to reset and M1003 65 66 00:07:54,110 --> 00:07:57,020 Get this off but always on. 66 67 00:07:57,020 --> 00:08:00,150 So let's stop our plc. 67 68 00:08:00,320 --> 00:08:07,640 Our plc is stopped and now just look out to y2. 68 69 00:08:08,000 --> 00:08:18,290 I will give to run our plc and first scan it is set ,so we can use M1000,1001,1002,1003 69 70 00:08:18,290 --> 00:08:20,980 --- 70 71 00:08:20,990 --> 00:08:29,810 with like this we can just uh follow our schematic also in here plc is at the run state with 71 72 00:08:29,810 --> 00:08:39,600 M1000 is always on ,when plc is off M1000 goes off in this moment when 72 73 00:08:39,610 --> 00:08:48,200 M1000 goes off and M1001goes high or on and M1002 just giving 73 74 00:08:48,200 --> 00:08:56,060 a pulse in here you can see and M1003giving pulse but in the negative direction 74 75 00:08:56,420 --> 00:08:57,270 for the. 75 76 00:08:57,290 --> 00:09:06,830 time bit you can see it in here one square wave goes high and low and again high this 76 77 00:09:07,040 --> 00:09:17,850 complete time is ten millisecond but to go on and to go off this time is ten millisecond divide by two. 77 78 00:09:17,870 --> 00:09:28,160 This is the result of half of M1011 settings and in here you can see it easily one minute 78 79 00:09:28,640 --> 00:09:39,290 then this goes high and goes to high and high and low and low and low and low and high this time just 79 80 00:09:39,290 --> 00:09:47,870 in the middle and this is 30 second this equals thirthy second and thirthy second on and thirthy. 80 81 00:09:47,910 --> 00:09:58,720 Second off so I'm finished in this video and this special and contacts are going to be helpful and we 81 82 00:09:58,710 --> 00:10:06,610 are going to use them all in our projects also then we can we should learn them all. 82 83 00:10:06,750 --> 00:10:15,810 effectively and there is a lot of m contacts and lot of special D registers and the 83 84 00:10:15,810 --> 00:10:22,050 contact types but these are all the basic ones and the important ones. 84 85 00:10:22,050 --> 00:10:25,490 So I'm finished in this video a moment. 85 86 00:10:25,740 --> 00:10:27,810 So see you in the next video.