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Analog module

Created by: suvarn at: 6/24/2011 8:04 AM (7 Replies)

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6/24/2011 8:04 AM	Rate (0)
suvarn Posts: 41 Rating: (1)	Hi friends, What is the difference between 12bit,13bit,14bit and 16bit analog i/p modules?
suvarn Posts: 41 Rating: (1)
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6/24/2011 8:25 AM	Rate (0)
Marcjan Platinum Expert Joined: 4/22/2010 Last visit: 3/31/2025 Posts: 5697 Rating: (716)	Have a look at the thread in my link, that explains a lot about the resolution of the analog cards. /tf/WW/en/Posts/44002 Regards, Marcjan
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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6/30/2011 5:02 PM	Rate (1)
tulinho Posts: 16 Rating: (1)	Dear suvarn, The diference among this modules refers to the resolution of the modules. In a 8bit module, for example, a given input from 0 to 10V can assume one value in a range of 0 to 256 when it's converted by the AD converter. In the other hand, in a 12bit module this range increases to a band from 0 to 4096. regards, Marco
tulinho Posts: 16 Rating: (1)
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This contribution was helpful to 1 thankful Users miami

7/31/2011 10:57 PM	Rate (0)
metwally mustafa Silver Member Joined: 10/10/2010 Last visit: 7/5/2025 Posts: 309 Rating: (15)	thank you tulinho

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8/3/2011 8:31 AM	Rate (0)
Darius Platinum Expert Joined: 9/28/2005 Last visit: 7/24/2025 Posts: 2957 Rating: (243)	tulinho Dear suvarn, The diference among this modules refers to the resolution of the modules. In a 8bit module, for example, a given input from 0 to 10V can assume one value in a range of 0 to 256 when it's converted by the AD converter. In the other hand, in a 12bit module this range increases to a band from 0 to 4096. regards, Marco Is it ? I allways knew that analog signal range is 0 to 27648 (not including underrange or overrange values). Only if you take for example 8 bit module then 7 least significant bits are just trash. So those 7 bits can be "0" or "1" independing from analog signal itself. So if analog signal changes in reality then it can change in steps of 2^7=128. The same rules apply to 13, 14 and 15 bits. 16 bit modules just has no trash bits. All bits are significant. Just check S7-300 module data manual chapter 5.1
	Best regards, Darius
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8/3/2011 8:58 AM	Rate (1)
Ayman Elotaify Platinum Expert Joined: 5/28/2008 Last visit: 9/3/2025 Posts: 4522 Rating: (843)	Hello, Resolution of the analog input is related directly to the precission of the reading of this analog input. Generally, each AI is read in a Word (16 bits) If we have an 8-bit resolution AI, by the physical changing of process value, only 8-bits will change accordingly. The same for 12, 13, 14 & 15 bit resolution. So, for 8-bit resolution, We have 8-bits changes its status according to the physical changes in the process (Bits 8 to 15) We have one bit for sign. The remaining 7 bits is not used. So when changes happen in the physical value, it affects the analog value. And as we have 7 bits not used, so the physical should change by at least a value equivalent to count value (2⁷= 128) to be monitored by the analog value. By increasing the resolution, this value became lower, so the less changes in the physical value can be monitored in this case, and of course the precission will be better.
	Ayman Elotaify
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This contribution was helpful to 2 thankful Users Berg Goodas

8/8/2011 7:48 PM	Rate (0)
metwally mustafa Silver Member Joined: 10/10/2010 Last visit: 7/5/2025 Posts: 309 Rating: (15)	thank you

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8/8/2011 9:48 PM	Rate (1)
poya_xp Posts: 167 Rating: (4)	Hi this picture must be helpful for explain the resolution in analogue Modules Attachment Capture.jpg (1903 Downloads)
poya_xp Posts: 167 Rating: (4)
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This contribution was helpful to 4 thankful Users Berg Free24 Frankie_ZA s&s_automation

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