1 00:00:00,700 --> 00:00:05,900 Welcome to Part 5 of our Mitsubishi GX Works 2 tutorial. 2 00:00:07,100 --> 00:00:10,800 We are going to discuss about Timers. 3 00:00:10,900 --> 00:00:17,400 The Mitsubushi FX PLC timer operates by counting 4 00:00:17,500 --> 00:00:26,800 clock pulses in 1 millisecond, 10 milliseconds or 100 milliseconds resolution. 5 00:00:29,600 --> 00:00:34,600 The timer device identifier is 'T'. 6 00:00:34,700 --> 00:00:41,800 It is a bit device with 0 (off) or 1 (on) output 7 00:00:41,900 --> 00:00:45,300 and the device address format is Decimal. 8 00:00:46,500 --> 00:00:55,800 The addressing of Timer is not the same as the X and Y devices 9 00:00:55,900 --> 00:00:58,700 which are limited to 0 to 7 or octal numbering system. 10 00:00:59,000 --> 00:01:10,700 The timers can be addressed from 0 to 9 decimal numbers. 11 00:01:10,900 --> 00:01:18,800 For example T0, T10, T11, T19, T20 and so on. 12 00:01:22,700 --> 00:01:34,000 The type of timer that we can use depends on the PLC type. 13 00:01:35,500 --> 00:01:46,700 For example, the FX1S PLC has normal timers only. 14 00:01:46,800 --> 00:01:49,100 It doesn't have retentive timers. 15 00:01:49,200 --> 00:02:01,300 The number of 100 ms timer for FX1S is only 63. 16 00:02:02,100 --> 00:02:09,500 It starts from T0 to T62. 17 00:02:11,600 --> 00:02:21,600 It has only 1 timer for the 1 ms resolution and it is T63. 18 00:02:23,300 --> 00:02:37,600 For the FX1N PLC there are 200 numbers of 100 ms normal timer from T0 to T199 19 00:02:38,900 --> 00:02:51,200 and there 6 numbers 100 ms retentive timers from T250 to T255. 20 00:02:53,000 --> 00:03:13,500 Retentive timers retains its present value even if the plc is stopped or there is a power failure. 21 00:03:14,500 --> 00:03:23,200 Once the plc is run again or the power is back, and the driving contact is closed 22 00:03:23,300 --> 00:03:30,700 the retentive will continue its counting from where it left off. 23 00:03:32,700 --> 00:03:44,100 Therefore the type of timer depends on the PLC type. 24 00:03:48,600 --> 00:03:56,900 This is how a timer program for an FX PLC is written. 25 00:04:03,000 --> 00:04:11,900 A drive input contact is needed to activate the timer. 26 00:04:13,100 --> 00:04:19,200 The timer uses an output coil symbol 27 00:04:19,300 --> 00:04:27,400 Press function key F7 or click the Coil symbol from the tool bar. 28 00:04:27,500 --> 00:04:48,000 Then enter the timer number, space and the constant K followed by the preset value. 29 00:04:48,100 --> 00:05:15,400 This is how timer preset value is computed. 30 00:05:15,500 --> 00:05:33,200 For a 10 seconds preset value with a 100ms timer resolution, 31 00:05:33,300 --> 00:05:46,800 looking at the FX1N timer device table, for 100 ms resolution, the available timer is from T0 to T199. 32 00:05:53,900 --> 00:06:07,000 Preset value in milliseconds divided by timer resolution. 33 00:06:07,100 --> 00:06:30,000 Converting 10 seconds to milliseconds equals to 10,000 milliseconds 34 00:06:30,100 --> 00:06:34,800 then divide by 100 milliseconds equals to 100. 35 00:06:34,900 --> 00:06:47,700 Therefor a 10 seconds preset value is equivalent to 100 K constant. 36 00:06:48,200 --> 00:07:13,000 We will add a timer contact to activate an output coil. 37 00:07:13,100 --> 00:07:23,500 Compile the program then we will simulate. 38 00:07:26,000 --> 00:07:36,000 We will close this contact. 39 00:07:37,000 --> 00:07:40,500 We can see that the timer starts counting. 40 00:07:40,600 --> 00:07:45,200 If we switch off the input contact the counted value goes back to 0. 41 00:07:45,300 --> 00:07:49,400 That is because this timer is normal timer and not a retentive type. 42 00:07:49,500 --> 00:07:52,400 We switch on again the drive contact. 43 00:07:55,000 --> 00:08:00,600 When the preset value of 10 seconds is reached,the timer contact will close. 44 00:08:05,600 --> 00:08:17,700 To open the timer contact and reset the timer the drive contact must be opened. 45 00:08:22,100 --> 00:08:28,600 That is how a normal Mitsubishi FX PLC timer works. 46 00:08:31,000 --> 00:08:36,300 There is also a retentive timer. 47 00:08:36,400 --> 00:08:45,100 This different from normal timer has the ability to retain 48 00:08:45,200 --> 00:08:56,600 the currently reached present value even after the drive contact has been removed. 49 00:09:01,000 --> 00:09:08,200 These are the retentive timers and these are the addresses. 50 00:09:08,300 --> 00:09:14,100 For FX1N, from T250 to T255. 51 00:09:17,400 --> 00:09:32,800 For FX3S from T131 to T137 for 100ms resolution. 52 00:09:36,000 --> 00:09:47,500 For FX3G 1ms resolution, from T246 to T249, 53 00:09:47,600 --> 00:09:58,000 the same as for FX2N. 54 00:09:59,000 --> 00:10:06,500 So the retentive timer depends on the PLC type except for FX1S 55 00:10:08,000 --> 00:10:15,100 Let us make an example for retentive timer. 56 00:10:42,800 --> 00:10:56,200 For example we need a 15 seconds timer, the constant should be 150. 57 00:11:54,500 --> 00:12:08,100 If we open the drive contact the counted value is retained. 58 00:12:08,200 --> 00:12:10,500 It did not reset to 0. 59 00:12:12,000 --> 00:12:20,100 When we switch on again the drive input X1, the counting continues. 60 00:12:21,000 --> 00:12:27,000 When it reaches the preset constant value of 150 61 00:12:27,100 --> 00:12:33,200 its contact will close and the output coil will be activated. 62 00:12:33,300 --> 00:12:39,000 Even if the drive contact will be switched off 63 00:12:40,500 --> 00:12:49,400 The timer is not reset. 64 00:12:49,500 --> 00:13:00,500 For retentive timers a reset instruction is needed. 65 00:14:05,000 --> 00:14:22,800 We simulate again this retentive timer. 66 00:14:22,900 --> 00:14:31,000 Switch off the drive input. The counted value is retained. 67 00:14:31,800 --> 00:14:38,700 We need to close this contact to activate the Reset instruction. 68 00:14:56,300 --> 00:15:02,200 We can see that the retentive timer has been reset and its contact is also opened. 69 00:15:06,800 --> 00:15:19,500 That is all for now for the basics of Mitsubishi FX PLC timers. 70 00:15:21,000 --> 00:15:27,900 For the next tutorial we will be discussing how to implement an Off delay timer on FX PLC. 71 00:15:28,000 --> 00:15:38,500 FX PLCs don't have built in off delay timers 72 00:15:38,600 --> 00:15:59,000 so we will make a small program using an ordinary timer. 73 00:16:00,100 --> 00:16:04,900 Thank you.