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PB defined en RAM for 130w+System 3

Created by: juanjoR at: 11/6/2008 8:28 PM (6 Replies)

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11/6/2008 8:28 PM	Rate (0)
juanjoR Posts: 20 Rating: (0)	Hi folks! I battling againts a PLC program of my machine. a Sinumerik System 3MM3GA4 with Dual PLC 130W. In the PLC1 program on the OB1 the first sentence is: JU PB18...... and the Last one is JU PB19 when i view the rebuild backup, and the original modules of this PLC, i noticed as PB18 and PB19 are not listed. so when the plc start goes directly to stop state, i think is by it,due i not able to listed this PB´s with the PG. I just found a Copy of the original printout of the program, see the coments and are marked as "PB in RAM" so my question is in this particulary case. who must load in RAM the PBs? i suposse is in the Local RAM of the PLC right? why this PB must be in RAM an not in Eprom? any help with this dude is wellcome thanks Juanjo
juanjoR Posts: 20 Rating: (0)
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11/7/2008 1:32 PM	Rate (0)
Pee Ell Sea Posts: 672 Rating: (57)	Hi, You will have to load the PB's into RAM. Maybe the EPROM ran out of space or it was a late change to the program on site and it was never blown onto EPROM. The only other very unlikely explanation is that somebody has been exceptionaly clever and is changing/writing the PB's with LIR and TIR instructions.
Pee Ell Sea Posts: 672 Rating: (57)
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11/7/2008 2:33 PM	Rate (0)
juanjoR Posts: 20 Rating: (0)	Hi Mr. Pee.. as i see, this modification was not doing at "field" due i get a original copy of a listing from the machine original docs, and it are clearly marked. You mention LIR and TIR, so i can suposse, the code for this pb, may be allocated in a DB epromed and a startup time tranfer to the RAM space. Well i suspect, but as i kwon the first block executed after a reset, is OB1, if OB1 calling the DBs in Ram, a exepction is produced due the PB not ara allocated, so may be a sort of error trapping and calling a routine to load this PBs in RAM so at next restart is present? i think on OB20 as example. but OB 20,21 and 22 have: ; JU FB 19 NAME: WIED.ANL BE is a call to warm restart. but in OB2 /no called by any segment/ have a secuence of tranfers with L and T. i attach the code. OB2 is a special block? how are manipulated.¿? i not found any info abouth this block number. this PB can be transfer by: The PLC2 to the PLC ram? Setting via Parameters loaded in the CNC? Thank you by you expertise! Juanjo Attachment ob2.pdf (280 Downloads)
juanjoR Posts: 20 Rating: (0)
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11/7/2008 8:16 PM	Rate (0)
Pee Ell Sea Posts: 672 Rating: (57)	Hi, OB20/OB21/OB22 are restart OB's which are called by the system only once on either a power up or a stop/run switch change. I can't remember what OB2 does but it could be either time base driven (e.g. 10ms) or interrupt driven by an input so it would be called by the system. Going online and checking the interrupt stack woudl be useful.
Pee Ell Sea Posts: 672 Rating: (57)
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11/7/2008 9:49 PM	Rate (0)
juanjoR Posts: 20 Rating: (0)	hello Mr. Pee. i seek info abouth OB2, also i discover a interest thing. the PLC2 have tha same secuence of calling PB18-PB19 and work fine so i try to listing this PBs in plc2 with the PG whitout success for example if i asking a directory they are not show, but if a want to edit this block the come to the screen as a blank space in ladder with only a vertical line (a empty work). i need to study a litte more in detail this singular way to do the thing in the 130w machines i try again and post the result, thanks by the support!! Juanjo
juanjoR Posts: 20 Rating: (0)
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11/8/2008 10:13 AM	Rate (0)
Pee Ell Sea Posts: 672 Rating: (57)	Hi juanjoR I have some english manuals on pdf if it would help.
Pee Ell Sea Posts: 672 Rating: (57)
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11/8/2008 11:55 AM	Rate (0)
juanjoR Posts: 20 Rating: (0)	hello Mr. Pee. thanks you very much for your offer abouth the manuals i accept it, i sent you a email. thanks again. Juanjo
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