Skip to Content

Register Login

Industry Online Support

Technical Forum

Navigation

1200 analog issue

Created by: Farrukh Bhatti at: 8/26/2012 4:34 PM (5 Replies)

Rating (0)

Thanks 1

6 Entries

8/26/2012 4:34 PM	Rate (0)
Farrukh Bhatti Posts: 37 Rating: (1)	Dear all, Some one can help me please. I am trying to read data 0-20ma through SM1231 AI, 1- What is the type of data i mean is it real,Int,Dint or word. 2- there is no word in drop down list of "conv"(converter block) how i can add it in. 3- How i can change the value in online mode after downloading the program in plc. 4- Can i simulate my program without CPU. CPU : 1214C TIA V11 regards Farrukh Ijaz
Farrukh Bhatti Posts: 37 Rating: (1)
Suggestion To thank Quote Answer

8/27/2012 8:00 AM	Rate (0)
Farrukh Bhatti Posts: 37 Rating: (1)	can some one help me in above issues......
Farrukh Bhatti Posts: 37 Rating: (1)
Suggestion To thank Quote Answer

8/27/2012 3:29 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 1/24/2025 Posts: 15558 Rating: (2468)	Farrukh Bhatti Dear all, Some one can help me please. I am trying to read data 0-20ma through SM1231 AI, 1- What is the type of data i mean is it real,Int,Dint or word. 2- there is no word in drop down list of "conv"(converter block) how i can add it in. 3- How i can change the value in online mode after downloading the program in plc. 4- Can i simulate my program without CPU. CPU : 1214C TIA V11 regards Farrukh Ijaz 0. 1214C with what plc firmware? FW 2.2 is suggested for V11. V11 SP2 Update 4 is latest available and is suggested. 1. Data type is Word or DINT. I would probably choose DINT in case the signal somehow goes negative I could detect or allow for it. 2. When tags are defined, the tag type defines what the CONV block shows. Once the tags are set to DINT, it should be fine. 3. How can you change the value of an analog input? Change the field device to change the signal it is sensing. You can also purchase a loop calibrator test instrument to simulate 0-20mA signals. 4. With the basic TIA Portal, simulation is not possible. However, the development kits for S7-1200 is a very good deal and allows you to develop and download/test your project at your desk. Others with the pro version have suggested developing the project for S7-1200, then make a copy of the project and test as an s7-300 since simulation is possible in the pro version for the s7-300/400 PLCs. Take a look at the FAQs on using 0-20mA signals on S7-1200 and TIA Portal. They describe how the signal in counts is 0-27648 relates to 0-20mA, and then use the NORM and SCALE commands to set the 0-27648 counts to user units (kPa, mm/sec, N, l/min, etc.).
	science guy
Suggestion To thank Quote Answer
This contribution was helpful to 1 thankful Users Farrukh Bhatti

8/27/2012 7:36 PM	Rate (0)
LarryAm Silver Member Joined: 9/19/2011 Last visit: 1/17/2025 Posts: 140 Rating: (33)	Questions 1 and 2). Here is one way to do the math. “in0” is the input which is 0 ma to 20 ma full scale. This translates to the integer (“int”) value of 0 to +27648 in the Siemens input format. In my example (attached) I scale this to 0 to 100.0 (“pressure”). The NORM_X and SCALE_X instructions are used for this. If the input were 4 ma to 20 ma then the NORM_X instruction would have a MIN input of 4 * 27648 / 20 = 5530. Question 3). Use a Force table. With this you can set (force) and input or output point to any value. See my example. Forcing the input to 6912 causes an output of 25.0. 6912 is one-fourth of the NORM_X input range (0 to 27648) which is scaled to 25.5 with the XCALE_X (0 to 100.0). Question4). I do not know of a simulator for the S7-1200. Attachment C:\Documents and Settings\AmerLJ\Desktop\AnalogScale&Format.zip (616 Downloads)

Suggestion To thank Quote Answer

9/12/2012 11:10 PM	Rate (0)
emergala Posts: 19 Rating: (0)	hi all, the analog inputs are integrated S71200 0-10V only!??, because S7-224XP for example are 0-20mA and 0-10V, is there any trick to use 0-20mA S71200.?? from already thank you very much Emerson
emergala Posts: 19 Rating: (0)
Suggestion To thank Quote Answer

9/13/2012 12:50 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 1/24/2025 Posts: 15558 Rating: (2468)	emergala hi all, the analog inputs are integrated S71200 0-10V only!??, because S7-224XP for example are 0-20mA and 0-10V, is there any trick to use 0-20mA S71200.?? from already thank you very much Emerson You can always add a resister across the input terminals to realize a voltage.
	science guy
Suggestion To thank Quote Answer

|

Share this page:

Share this page on...

Follow us on