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ONLINE WITH PLC with 3-4 PG same time ??

Created by: vipz at: 6/4/2014 12:08 PM (8 Replies)

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6/4/2014 12:08 PM	Rate (0)
vipz Gold Member Joined: 9/2/2012 Last visit: 8/15/2024 Posts: 711 Rating: (30)	Hai all, Here one of our customer doing onsite commissioning. PLC used is 317 2PN/DP. They are 4 people doing program development on same plc, communicating via Ethernet. Same time, two people can go online with plc( i mean monitoring), but when trying by 3rd person on same time, getting ERROR-D063 Resource error trigger event occuppied. (ofcourse i read other threads related to this error, but my situation and quesion is different) In hardware configuraion, resources allowed for PG is made to 5, but still the problem is same. so whare i can get the info-- how many PG can go online with PLC same time ? what are the factor deciding this count ? please suggest.
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6/4/2014 1:54 PM	Rate (0)
olloy Silver Member Joined: 8/27/2010 Last visit: 4/13/2024 Posts: 417 Rating: (37)	Hi! The maximum number of breakpoints that can be used is determined by the CPU used. Fourbreakpoints: All SIMATIC S7-400 CPUs All SIMATIC S7-300 CPUs as from firmware V3.x CPU 318-2 DP Twobreakpoints: All SIMATIC S7-300 CPUs (except CPU 318-2 DP) with firmware lower than V3.x If you have used up your breakpoint resources, you must first reset (delete) a breakpoint before you can set it at another point. Here you must note that breakpoints already run through continue to occupy resources. If you exceed the maximum number of breakpoints that can be used, you get an error message "D062 / D063" (resources exceeded). I guess same is for monitoring variables with PG communication.

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6/4/2014 2:51 PM	Rate (1)
H-H Platinum Member Joined: 7/2/2008 Last visit: 8/26/2024 Posts: 928 Rating: (308)	Hello Everyone, I thinkS7-300 is limited to only 2 PGconnections at the same time. Maybe I'm a bit old right now but I couldn't find different information. Best regards, H-H

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6/4/2014 3:07 PM	Rate (0)
olloy Silver Member Joined: 8/27/2010 Last visit: 4/13/2024 Posts: 417 Rating: (37)	H-H Maybe I'm a bit old right now but I couldn't find different information. I think we have lack of answers just because premium campaign is finished //However, I'm also did not find any related information except already provided. Maybe I'm old too

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6/4/2014 6:46 PM	Rate (0)
vipz Gold Member Joined: 9/2/2012 Last visit: 8/15/2024 Posts: 711 Rating: (30)	Dear Both , thanks for the information provided. its very useful. Hi olloy, The maximum number of breakpoints that can be used is determined by the CPU used. may i know what is this breakpoints ?? as you suggest, delete it, where i can find this? (may be in future this info will be helpful)
	Last edited by: vipz at: 6/4/2014 6:47 PM With Best Regards VIPZ
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6/4/2014 7:03 PM	Rate (0)
Aret Posts: 2348 Rating: (264)	Generally CPU communications are limited to PDU also, so even if you could connect a lot of PG to same CPU speed will be too slow to work with.
Aret Posts: 2348 Rating: (264)
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6/5/2014 9:22 AM	Rate (1)
olloy Silver Member Joined: 8/27/2010 Last visit: 4/13/2024 Posts: 417 Rating: (37)	vipz Dear Both , may i know what is this breakpoints ?? Please readthislink.

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6/5/2014 6:56 PM	Rate (0)
vipz Gold Member Joined: 9/2/2012 Last visit: 8/15/2024 Posts: 711 Rating: (30)	Hai Aret, PDU means ?
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6/6/2014 7:22 AM	Rate (0)
olloy Silver Member Joined: 8/27/2010 Last visit: 4/13/2024 Posts: 417 Rating: (37)	Here is a description from creator ofSnap7 library. Simple to understand: S7 Protocol, is the backbone of the Siemens communications, its Ethernet implementation relies on ISO TCP (RFC1006) which, by design, is block oriented. Each block is named PDU (Protocol Data Unit), its maximum length depends on the CP and is negotiated during the connection. S7 Protocol is Function oriented or Command oriented, i.e. each transmission contains a command or a reply to it. If the size of a command doesn't fit in a PDU, then it must be split across more subsequent PDU. Each command consists of · A header. · A set of parameters. · A parameters data. · A data block.

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