1 00:00:00,00 --> 00:00:05,900 Welcome to Part 4 of our Mitsubishi GX Works 2 tutorial. 2 00:00:06,400 --> 00:00:13,000 Our topic is about the Set and Reset Instruction of Mitsubishi FX PLC. 3 00:00:14,700 --> 00:00:17,200 If you are familiar of latching circuit 4 00:00:17,300 --> 00:00:21,100 that is most used in relay logic direct on line motor starter 5 00:00:21,200 --> 00:00:27,800 this is almost the same function as the Set and Reset instruction of the PLC. 6 00:00:33,000 --> 00:00:39,800 Let us see the operation of an ordinary latching circuit. 7 00:00:45,000 --> 00:00:47,100 This is the stop button 8 00:00:47,200 --> 00:00:49,400 and this is the start button. 9 00:00:50,000 --> 00:00:52,900 If we activate the start button 10 00:00:54,000 --> 00:00:56,800 The output coil will be latched. 11 00:00:59,700 --> 00:01:08,400 Even if the start button is released the output is latched through this contact. 12 00:01:09,500 --> 00:01:22,000 If we press the stop button the latch will be released. 13 00:01:22,800 --> 00:01:26,200 The coil will then be deactivated. 14 00:01:27,000 --> 00:01:29,800 For the Set and Reset instruction 15 00:01:32,200 --> 00:01:36,400 This will be the start pushbutton and this will be the stop pushbutton 16 00:01:36,500 --> 00:01:39,000 and this is the output coil. 17 00:01:40,500 --> 00:01:48,000 If we activate this contact 18 00:01:48,100 --> 00:01:51,500 the output coil will be set. 19 00:01:51,600 --> 00:02:00,000 Even if the input contact is opened the output coil will remain On. 20 00:02:06,000 --> 00:02:09,000 In order to turn off the output coil 21 00:02:09,100 --> 00:02:15,000 the Reset instruction must be activated. 22 00:02:25,000 --> 00:02:30,000 That is the basics for Set and Reset instruction. 23 00:02:36,500 --> 00:02:43,600 Set and Reset instructions are not limited to latching applications. 24 00:02:43,800 --> 00:02:49,400 Reset is also used in PLC counter applications. 25 00:02:50,500 --> 00:02:56,800 For example in counters, if the Set value has been reached 26 00:02:57,500 --> 00:03:04,500 Reset should be used in order to return back to 0 count. 27 00:03:06,500 --> 00:03:08,000 We will see how it works. 28 00:03:18,200 --> 00:03:22,300 Even if the Preset value has not been reached,if the counter is reset 29 00:03:22,400 --> 00:03:25,000 the current count value will reset to 0. 30 00:03:27,000 --> 00:03:36,500 We will try to count up to the set value 31 00:03:42,000 --> 00:03:48,500 The counter coil is activated and its contact is closed 32 00:03:48,600 --> 00:03:55,500 The output coil is also activated. 33 00:04:02,000 --> 00:04:09,000 In order to open the this contact the counter must be reset. 34 00:04:10,400 --> 00:04:16,700 This input contact must be activated to reset the counter. 35 00:04:27,500 --> 00:04:36,700 For timer application, reset is used for retentive type timers. 36 00:04:36,800 --> 00:04:43,800 These are the timers that in the event the PLC is stopped 37 00:04:43,900 --> 00:04:59,000 or there is a power failure the running count value during the time the PLC stopped is retained. 38 00:05:00,200 --> 00:05:04,500 For example when we activate this X4 input contact 39 00:05:05,000 --> 00:05:08,300 the timer will start counting. 40 00:05:08,400 --> 00:05:16,700 Suppose this contact will open, the current count is retained. 41 00:05:26,000 --> 00:05:34,000 It has the capability to pause the counting or timing process. 42 00:05:34,100 --> 00:05:38,300 In order to continue the timing this input contact must be closed. 43 00:05:43,000 --> 00:05:52,500 Once the set value is reached the timer contact will close. 44 00:06:10,000 --> 00:06:15,100 The timer contact closed ang the output coil is energized. 45 00:06:15,200 --> 00:06:22,400 Even if this input contact is opened the timer will not reset. 46 00:06:30,500 --> 00:06:36,600 In order to reset the timer to 0, and to open the timer contact 47 00:06:36,700 --> 00:06:39,500 the timer has to be reset. 48 00:06:48,000 --> 00:06:52,200 That is how to use the Reset instruction for Retentive Timer. 49 00:06:52,300 --> 00:07:03,000 The timer can also be reset while in the middle of timing process. 50 00:07:14,000 --> 00:07:23,300 For data registers or other word devices its value can be reset. 51 00:07:24,000 --> 00:07:29,200 For example we have accummulated value in the data register, 52 00:07:29,500 --> 00:07:37,200 supposing there is a sensor in the input that counts finished products 53 00:07:37,300 --> 00:07:49,200 the accummulated number can be reset. 54 00:07:49,300 --> 00:07:52,800 We will see how it works. 55 00:07:52,900 --> 00:08:00,800 Every time the input goes high, 56 00:08:00,900 --> 00:08:06,900 the data register value is incremented due to the Increment Instruction. 57 00:08:25,000 --> 00:08:28,000 In order to reset the data register value to 0, 58 00:08:28,500 --> 00:08:36,000 we will provide a Reset Instruction to the data register. 59 00:08:48,500 --> 00:08:52,200 There is also a Zone Reset Instruction. 60 00:08:52,300 --> 00:09:05,700 This is used to reset in one time a range of bit devices, counters, timers or data registers. 61 00:09:06,500 --> 00:09:16,500 Example this range of auxiliary relays are set, 62 00:09:17,200 --> 00:09:20,500 we ran reset all of it in one time. 63 00:09:21,000 --> 00:09:27,400 For example from M10 to M12 can be reset in one time. 64 00:09:27,500 --> 00:09:30,800 The instruction is Zone Reset, 65 00:09:32,400 --> 00:09:36,600 This is the first destination device 66 00:09:36,800 --> 00:09:40,600 and this is the second destination device. 67 00:09:40,700 --> 00:09:45,500 The second destination device must be higher 68 00:09:45,600 --> 00:09:50,800 compared to the first destination device. 69 00:09:57,000 --> 00:10:04,900 The specified device range cannot contain mixed device types. 70 00:10:05,100 --> 00:10:10,000 For example a counter here and the other is a timer is not allowed. 71 00:10:10,100 --> 00:10:23,500 Devices must be of the same type. 72 00:10:23,600 --> 00:10:37,000 For example we set M10 to M13 73 00:10:39,000 --> 00:10:46,600 then we will reset in one time M10 to M12. 74 00:10:53,000 --> 00:10:59,100 The three auxiliary devices has been reset. 75 00:10:59,600 --> 00:11:02,700 M13 was not included because 76 00:11:02,800 --> 00:11:08,900 only the devices within the range is covered by the zone reset instruction. 77 00:11:09,600 --> 00:11:13,400 So we have to reset M13 individually. 78 00:11:24,000 --> 00:11:34,700 That is all for the basic tutorial on how to use the Set and Reset instruction. 79 00:11:36,000 --> 00:11:43,500 We will discuss the Timers on the next video tutorial. 80 00:11:45,000 --> 00:11:50,500 Thank you.