Skip to Content

Register Login

Industry Online Support

Technical Forum

Navigation

Reconfiguration of analog input / output

Created by: fifo92 at: 4/10/2019 1:24 PM (8 Replies)

Rating (2)

Thanks 3

9 Entries

4/10/2019 1:24 PM	Rate (0)
fifo92 Advanced Member Joined: 3/7/2018 Last visit: 3/27/2023 Posts: 12 Rating: (0)	Hi I am working on small project but i am stuck with one problem. I want to change analog input / output range for example AI1 from 0-10 V to 4-20mA with user program ( or by HMI). I found just some examples how to change whole module but not just inputs or outputs. Thank you for your help :)

Suggestion To thank Quote Answer

4/10/2019 2:19 PM	Rate (0)
Jay. Posts: 1283 Rating: (103)	You are talking about hardware configuration of a particular AI channel which is not possible to change when the PLC is running. When you change it, it needs to be compiled and downloaded again. So it's not possible as far as I know.
Jay. Posts: 1283 Rating: (103)	Last edited by: Jay. at: 4/10/2019 2:20:09 PM
Suggestion To thank Quote Answer

4/10/2019 11:57 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 3/28/2023 Posts: 13209 Rating: (2147)	This option is available on the S7-1500 series of PLCs on analog input modules that support dynamic configuration. Does the module you want to change allow this according to the module documentation? I ask because there may be a new module out that might allow this that I don't know about. With V15.1 of TIA Portal, firmware 4.3, and a new module, it might be possible. However, I doubt it because the S7-1200 family are at the basic PLC component level. You can and should submit a Siemens Support Request and ask that very question. Be sure and provide the following in your request: TIA Portal Version and update, PLC Part #, AI module part #, firmware revision for PLC and AI module. Please post back what they say. fifo92 Hi I am working on small project but i am stuck with one problem. I want to change analog input / output range for example AI1 from 0-10 V to 4-20mA with user program ( or by HMI). I found just some examples how to change whole module but not just inputs or outputs. Thank you for your help :)
	science guy
Suggestion To thank Quote Answer

4/11/2019 12:07 AM	Rate (2)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 3/28/2023 Posts: 13209 Rating: (2147)	If Siemens comes back with the answer that it cannot be done on the S7-1200 and you absolutely must have this option, do the transition in hardware and adjust scaling of the input signal accordingly. To do this in hardware: --one way-- 1. Configure the PLC analog input to 0-20mA 2. Install a DPDT relay so you can insert or not insert a 500Ω resistor across the input signal. Control the relay with a digital output controlled by your PLC / HMI configuration where they can switch analog input types. 3. When the dig out controlling the AI-input-type relay is ON (meaning it is operating 0-10VDC), scale the analog input for 0-27648. 4. When the dig out is OFF (operating 0-20mA), scale the analog input for 4/27648 to 27648. --another way-- Buy a hardware device with an input select signal that converts an analog signal which is either 0-20mA, 4-20mA, or 0-10VDC to a standard 0-20mA, 4-20mA, or 0-10VDC signal and send that configurable signal converters output to the PLC analog input. fifo92 Hi I am working on small project but i am stuck with one problem. I want to change analog input / output range for example AI1 from 0-10 V to 4-20mA with user program ( or by HMI). I found just some examples how to change whole module but not just inputs or outputs. Thank you for your help :)
	science guy
Suggestion To thank Quote Answer
This contribution was helpful to 2 thankful Users fifo92 grrrrrroooo

4/11/2019 10:06 AM	Rate (0)
fifo92 Advanced Member Joined: 3/7/2018 Last visit: 3/27/2023 Posts: 12 Rating: (0)	OUuu Thank you it is good idea. But i have to buy realy precise resistor.

Suggestion To thank Quote Answer

4/11/2019 10:09 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 3/28/2023 Posts: 13209 Rating: (2147)	1% works great for me. fifo92 OUuu Thank you it is good idea. But i have to buy realy precise resistor.
	science guy
Suggestion To thank Quote Answer

12/31/2020 7:27 AM	Rate (0)
Mohamad Faizal Romli Advanced Member Joined: 7/1/2020 Last visit: 3/6/2023 Posts: 46 Rating: (2)	Hello Einstein. May I know how to do number 1 without additional card or hardware? I am planning to use 6ES7215-1AG40-0XB0 AI. What I saw in document is only support 0 to 10V. I know some of the AI card for S7-400 can change between 0 to 20mA or 4 to 20mA which can be done in hardware configuration. Regards, Faizal 0_Einstein If Siemens comes back with the answer that it cannot be done on the S7-1200 and you absolutely must have this option, do the transition in hardware and adjust scaling of the input signal accordingly. To do this in hardware: --one way-- 1. Configure the PLC analog input to 0-20mA 2. Install a DPDT relay so you can insert or not insert a 500Ω resistor across the input signal. Control the relay with a digital output controlled by your PLC / HMI configuration where they can switch analog input types. 3. When the dig out controlling the AI-input-type relay is ON (meaning it is operating 0-10VDC), scale the analog input for 0-27648. 4. When the dig out is OFF (operating 0-20mA), scale the analog input for 4/27648 to 27648. --another way-- Buy a hardware device with an input select signal that converts an analog signal which is either 0-20mA, 4-20mA, or 0-10VDC to a standard 0-20mA, 4-20mA, or 0-10VDC signal and send that configurable signal converters output to the PLC analog input. fifo92 Hi I am working on small project but i am stuck with one problem. I want to change analog input / output range for example AI1 from 0-10 V to 4-20mA with user program ( or by HMI). I found just some examples how to change whole module but not just inputs or outputs. Thank you for your help :)

Suggestion To thank Quote Answer

12/31/2020 7:38 AM	Rate (0)
qwazee Platinum Expert Joined: 3/30/2020 Last visit: 3/28/2023 Posts: 3314 Rating: (737)	Faizalromli Hello Einstein. May I know how to do number 1 without additional card or hardware? I am planning to use 6ES7215-1AG40-0XB0 AI. What I saw in document is only support 0 to 10V. I know some of the AI card for S7-400 can change between 0 to 20mA or 4 to 20mA which can be done in hardware configuration. Regards, Faizal Hello Faizal. No, the analog inputs built into the 1200 CPU cannot be set to 0 - 20mA. It is as your research says: built-in analog inputs can only be 0 - 10mA. Consider the use of an external 500ohm resistor. In the field I had a problem with no access to resistors. I had to use a variable speed drive to process the 4 - 20 mA signal. Good health.
	Activities of this user is voluntary. There is no obligation or liability placed on this user. Though optional, your 'please' and 'thank you' is highly valued.
Suggestion To thank Quote Answer
This contribution was helpful to 1 thankful Users rijorijorijo

12/31/2020 8:11 AM	Rate (0)
Mohamad Faizal Romli Advanced Member Joined: 7/1/2020 Last visit: 3/6/2023 Posts: 46 Rating: (2)	Hello qwazee, Aw that too bad since I plan to use my AI to test 4 to 20mA analog sensor. How do I connect the 500ohm resistance together with 4 to 20mA sensor? Regards, Faizal

Suggestion To thank Quote Answer

|

Share this page:

Share this page on...

Follow us on