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OB1 First Scan

Created by: kanan at: 8/2/2008 11:00 AM (6 Replies)

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8/2/2008 11:00 AM	Rate (0)
kanan Posts: 133 Rating: (2)	Hi! I have OB1 with first scan command. But i can not undestand when this scan happens? Here below is pasted programme-i need to know how "bOb1FirstScan" this become active? please help.regards \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ CLR // Clear RLO = "bFalse" // Force FALSE = "bTestFalse" SET // Set RLO = "bTrue" // Force TRUE = "bTestTrue" // S "bSimulator" // Simulator active R "bSimulator" // Simulator not active L #OB1_SCAN_1 // Get scan type L 2 // Highes restart scan type <=I // Restart ? = "bOb1FirstScan" // Set bOb1FirstScan S "bCyclic1FirstScan" // Set for cyclic 1 S "bCyclic2FirstScan" // Set for cyclic 2 S "bCyclic3FirstScan" // Set for cyclic 3 \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
kanan Posts: 133 Rating: (2)
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8/3/2008 9:45 AM	Rate (2)
Gebhardt Karl Platinum Member Joined: 7/16/2006 Last visit: 1/2/2024 Posts: 1502 Rating: (176)	>Hi! I have OB1 with first scan command. But i can not undestand when this scan happens? Here >below is pasted programme-i need to know how "bOb1FirstScan" this become active? On "#OB1_SCAN_1" you can read number of scan Variable is : 1 (Cold restart scan 1 of OB 1), 3 (Scan 2-n of OB 1) >L #OB1_SCAN_1 // Get scan type >L 2 // Highes restart scan type > <=I // Restart ? >= "bOb1FirstScan" // Set bOb1FirstScan >S "bCyclic1FirstScan" // Set for cyclic 1 If#OB1_SCAN_1(1) <= 2 --> bOb1FirstScan = 1 If#OB1_SCAN_1(5)<= 2 --> bOb1FirstScan =0 and the next Time If#OB1_SCAN_1 (10)--> = "bOb1FirstScan" Allway 0 ( "=" instriction) If#OB1_SCAN_1 (10)--> = "bCyclic1FirstScan"Allway1 ( "S" instriction) I think, it is better you use the OB100 Cycle. He start at first, BEFORE OB1 started and onlyone cycle. (Here you can initialiced , than you need it not (min.Cycletime) ) ( else you must ask everystart each beginn OB1 Cycle)
	Karl
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8/3/2008 12:30 PM	Rate (0)
kanan Posts: 133 Rating: (2)	thank you gravieren_for reply! the problem is this bit: >= "bOb1FirstScan" // Set bOb1FirstScan after each activation used in programme to reset several things( for example some active movements etc.) and i do not undestand why we need this? regards
kanan Posts: 133 Rating: (2)
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8/3/2008 1:24 PM	Rate (3)
Gebhardt Karl Platinum Member Joined: 7/16/2006 Last visit: 1/2/2024 Posts: 1502 Rating: (176)	>= "bOb1FirstScan" // Set bOb1FirstScan after each activation used in programme to reset several things( for example some active movements etc.) and i do not undestand why we need this? regards >= "bOb1FirstScan" // Set bOb1FirstScan Thisbit is only in 1st. Cycle aktiv ! After the 1st Cycle they are allways "0". You can use this for several thinks ( Same as OB100 is possible) Example: The CPU is started, on 1st cycle you are sure, that the mixed motor (A1.0 or Q1.0)are not works. You can say. U bOb1FirstScan R Q1.0 Or you can set Basis-Parameter as example "reset PID-Control FB" >after each activation used in programme to reset several things >( for example some active movements etc.) >and i do not undestand why we need this? I think without CPU is running, "active movements" are not work. After start CPU, it is sure, axis are standing still. Now you thay, axis are not work. Example: Static memory (remanenz is on) (German Conversation) UE5.0 // Start button S M1.0 // Memory Relais Motor on UN E5.1 // Stop Button R M1.0 // Memory Motor is stand still // After start CPU make sure, output are not ON U bOb1FirstScan R M1.0 U M1.0 = A1.0 I hope, you understand me. Ask, if you not understand, this isurgend for you
	Karl
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8/4/2008 4:44 AM	Rate (0)
kanan Posts: 133 Rating: (2)	thanks gravieren_! I undestand what is that for-so after each restart of plc i need some resets which neccessary and i use this bit for that job! thank you very much! good luck!
kanan Posts: 133 Rating: (2)
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8/4/2008 9:20 AM	Rate (2)
Gebhardt Karl Platinum Member Joined: 7/16/2006 Last visit: 1/2/2024 Posts: 1502 Rating: (176)	Hi For Info: Youcan write your intialition in OB100 write too. OB100 are only one started at warmstart/restart and only for 1 cycle. OB100 // 1 Cycle at start, and than NO call Rmotion R Counter . . . OB1 // And here is thecycle-code U E 1.0 S A 5.0 UN E 1,1 R A5.0 Karl(only 1 point for my help)
	Last edited by: gravieren_ at: 8/4/2008 9:20 AM Karl
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3/4/2013 2:36 PM	Rate (1)
G_R_E_Y_31 Bronze Member Joined: 5/26/2011 Last visit: 8/5/2024 Posts: 456 Rating: (7)	.
	Last edited by: nicer at: 3/4/2013 2:49 PM
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