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analog output problem

Created by: Mr.autonics at: 11/27/2017 6:04 PM (9 Replies)

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11/27/2017 6:04 PM	Rate (0)
Mr.autonics Member Joined: 9/9/2017 Last visit: 7/14/2019 Posts: 8 Rating: (0)	hi evey one , i have problem in SM1234 (AI/AQ) , i want to have get 4~20 ma from AQ1 , according to manual For example when i move 0 to QW96 the AQ1 should have 4 MA , when i move 27648 to QW96 the AQ1 should have20 MA , but in fact when i move 0 to QW96 the AQ1 was 0 and when i move for example 1000 to QW96 the AQ1 was 18.63 ma that is not true. i use 0 and M0 terminal and i did every setting that i need in tia software.
	Last edited by: Mr.autonics at: 11/27/2017 6:11:48 PM
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11/27/2017 6:17 PM	Rate (0)
Mr.autonics Member Joined: 9/9/2017 Last visit: 7/14/2019 Posts: 8 Rating: (0)	do i need to do any modification in setting or wiring?

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11/27/2017 7:32 PM	Rate (1)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 12/6/2019 Posts: 8266 Rating: (1397)	Is your output load within the specified ratings from the s7-1200 system manual for your PLC? 4ma on a 0-20mA channel is not 0 in the output word. It's 4/20 times 27648 since 0 mA is 0, and 20mA is 27648. Mr.autonics do i need to do any modification in setting or wiring?
	science guy
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11/30/2017 5:47 PM	Rate (0)
Mr.autonics Member Joined: 9/9/2017 Last visit: 7/14/2019 Posts: 8 Rating: (0)	thanks for asked my question , but i dont undrestand you, i did set everything in software and hardware but it had this broblem , i had to use output voltage for my project but it wasn,t good for me
	Last edited by: Mr.autonics at: 11/30/2017 6:11:12 PM
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11/30/2017 7:05 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 12/6/2019 Posts: 8266 Rating: (1397)	Please post a screenshot of your hardware configuration for one analog output configured for loop current output. On the s7-1200's I have worked with, I have only seen 0..20mA, not 4..20mA. You have to start your 0 at 4mA by sending a value to that will cause 4mA on a 0..20mA analog output. Similar to say you want 2 volts on a 0..10VDC analog output. What value is required for 2VDC? Same applies here. Mr.autonics thanks for asked my question , but i dont undrestand you, i did set everything in software and hardware but it had this broblem , i had to use output voltage for my project but it wasn,t good for me
	science guy
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12/5/2017 1:50 PM	Rate (0)
LarryAm Bronze Member Joined: 9/19/2011 Last visit: 12/2/2019 Posts: 98 Rating: (27)	huggy_d1 Please post a screenshot of your hardware configuration for one analog output configured for loop current output. On the s7-1200's I have worked with, I have only seen 0..20mA, not 4..20mA. You have to start your 0 at 4mA by sending a value to that will cause 4mA on a 0..20mA analog output. Similar to say you want 2 volts on a 0..10VDC analog output. What value is required for 2VDC? Same applies here. Mr.autonics thanks for asked my question , but i dont undrestand you, i did set everything in software and hardware but it had this broblem , i had to use output voltage for my project but it wasn,t good for me Huggy_d1, All S7-1200 analog input and output signal modules (SM's) support a 4-20mA range. This has been the case since firmware version 2.x.x which started production in 2013. Larry

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12/5/2017 4:11 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 12/6/2019 Posts: 8266 Rating: (1397)	The Ai/AQ modules in my catalog for V13 SP2 (SM1234) both show support for 0..20mA, and neither support 4..20mA. Drop them into your project and see for yourself. LarryAm huggy_d1 Please post a screenshot of your hardware configuration for one analog output configured for loop current output. On the s7-1200's I have worked with, I have only seen 0..20mA, not 4..20mA. You have to start your 0 at 4mA by sending a value to that will cause 4mA on a 0..20mA analog output. Similar to say you want 2 volts on a 0..10VDC analog output. What value is required for 2VDC? Same applies here. Mr.autonics thanks for asked my question , but i dont undrestand you, i did set everything in software and hardware but it had this broblem , i had to use output voltage for my project but it wasn,t good for me Huggy_d1, All S7-1200 analog input and output signal modules (SM's) support a 4-20mA range. This has been the case since firmware version 2.x.x which started production in 2013. Larry
	science guy
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12/12/2017 2:17 PM	Rate (0)
AutoGen_4853251 Member Joined: 7/10/2017 Last visit: 5/1/2018 Posts: 2 Rating: (0)	Hello huggy_d1, Please see the attached screen shot from my TIA Portal v13 SP1 update5. Larry Attachment 2017-12-12-Project2.jpg (32 Downloads)

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12/12/2017 7:08 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 12/6/2019 Posts: 8266 Rating: (1397)	Not sure what I did last week exactly, but today, with V13 SP2, I get the same results as you, that a single analog combination input / output module has both 0 - 20mA and 4 - 20mA current loop options. No other analog output module has the option. Just the one xxxx xxx-xxx32-xxxx AI/AQ module. So while I stand corrected, that is still the only analog module offering 4-20mA. All other modules regardless of firmware (at least for me) only offer 0-20mA. I probably misunderstood the comment that made me look and say something wrong. Still my mistake. AutoGen_4853251 Hello huggy_d1, Please see the attached screen shot from my TIA Portal v13 SP1 update5. Larry
	science guy
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12/13/2017 6:29 PM	Rate (0)
AutoGen_4853251 Member Joined: 7/10/2017 Last visit: 5/1/2018 Posts: 2 Rating: (0)	Hello huggy_d1, You are correct. The analog outputs do not support 4-20 mA. Only the analog inputs support 4-20mA. Larry

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