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migration S5-Analog issues Units +Resolution

11/18/2014 11:18 AM	Rate (0)
the_anais2 Posts: 7 Rating: (0)	Hello, I have a problem to understand the difference between units & resolution in step5, this is my example : I have a S5-CPU 115U 942 which uses Analog modules : Input 460-7LA11 (2048 units)/Output : 470-7LA12(1024 units) when reading rhe s5 pgm : the 2048 pts go to 16384 in ACCU for inputs & 1024 units go to16384 for outputs so it's not the same thing as S7 ( 27684 go to 27684!!!!) so what's the meaning of 2048/1024 units???!!!! and how to know which resolution a S5 analog module gives really to know which ratio use when migrating. many thanks SBH
the_anais2 Posts: 7 Rating: (0)
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11/18/2014 11:31 AM	Rate (0)
meeda Posts: 143 Rating: (5)	Hello, You might find this FAQ helpful: https://support.automation.siemens.com/WW/adsearch/resultset.aspx?region=WW&lang=en&netmode=intranet&ui=NDAwMDAxOAAA&term=s5+to+s7+conversion&ID=17603092&ehbid=17603092 Regards.
meeda Posts: 143 Rating: (5)
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11/19/2014 7:09 PM	Rate (0)
the_anais2 Posts: 7 Rating: (0)	hello, thank you for your help, I've aleady seen this link, the problem that they say :16384 units are only used for R64 modules, but I have a 6ES5460 7LA11, which is a 2048 units but when migrating the level goes to 16384 !!!!!
the_anais2 Posts: 7 Rating: (0)
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11/21/2014 11:24 AM	Rate (0)
ArviK Posts: 5 Rating: (1)	Hey, S5 analog value is in higher 13 bits. So the real value is just shifted left by 3, in other words multiplied by three times by 2. Lower 3 bits are status bits, signalling overflow or fault. So your analog input word 16 bits consists of 13 bits analog value plus 3 bits status value. To get real analog value, shift it to right by 3, that means divide three times by two or just by 8. 16384 / 8 = 2048 In the 115 manual, page 10-39 it is explained with examples. All the modules are supposed to be there, but i could not find your module 460-7LA11, maybe you have 466-7LA11 ??? https://support.automation.siemens.com/WW/llisapi.dll/csfetch/1085937/6ES5+998-0UF23.pdf?func=cslib.csFetch&nodeid=1118160&forcedownload=true
ArviK Posts: 5 Rating: (1)	Last edited by: ArviK at: 11/21/2014 11:31 AM
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