analog input numbering 231-0HF22-0XA0

Hi all,

if anyone can explain to me how are numbered the 8 inputs AI1, AI2, ... AI8 of the module 6ES7 231-0HF22-0XA0. Thanks.

Best regards.

mirip.

Hello.

mirip

Hi all,

if anyone can explain to me how are numbered the 8 inputs AI1, AI2, ... AI8 of the module 6ES7 231-0HF22-0XA0. Thanks.

Best regards.

mirip.

There are 4 groups of IO addressing: digital input, digital output, analog input and analog input. The address numbering of one group does not influence the other group.

The addressing numbering of an IO point in a group depends on the existence of other IO points of the same group.

See the attached picture for clarity on the subject.

Best Regards.

Hello Mirip;

To add to Dan's (#dP) post, the base (starting address of the S7-200 analog modules is determined by their position next to the CPU, and the number of analog modules preceding them.

This is explained vey well in this FAQ, and in the S7-200 System manual, in the section PLC Concepts.

Which addresses do the S7-200 input/outputs of the S2-200 expansion modules receive?

https://support.industry.siemens.com/cs/ww/en/view/24122845

S7-200 System manual:

https://support.industry.siemens.com/cs/ww/en/view/1109582

I hjave tried to illustrate this concept in the following attachment; if the base address of the module is AW8 (for example), then each analog input circuit follows: AW10, AW12... AW22

Hope this helps,

Daniel Chartier

Thanks #dP and dchartier, but here is my problem in image:

Best regard,

mirip

mirip

Thanks #dP and dchartier, but here is my problem in image:

Best regard,

mirip

 - Which CPU do you have?
- What other cards are there?

Assuming the PLC is built as:
1. 6ES7 214-1AD23-0XB0 
          ^{(CPU224 DC/DC/DC, no on-board analogs)}
2. 6ES7 231-0HF22-0XA0
          ^{(EM231, 8 analog inputs)}

(upper side)
AIW0 ---- Channel A
AIW2 ---- Channel B

AIW4 ---- Channel C
AIW6 ---- Channel D

AIW8 ---- Channel E
AIW10 --- Channel F

(lower side)
AIW12 --- Channel G
AIW14 --- Channel H

Where you are showing in the picture is AIW10 - Channel F.

How about disconnecting all the analogs and then placing these back, one-by-one and checking which ones react as expected. Make also VERY sure to "short" unused channels.

EDIT1
The CPUs CPU224XP and CPU224XPsi each has x2 analog inputs. Those are the only CPUs with analog inputs. The analog input addresses in those cases will be offset so that Channel A starts with AIW4.

BR

cpu 6ES7 216-2AD23-0XA0  and analog module 231 0HF22.

if an input is not used and not "shorted", what is the result?

mirip

cpu 6ES7 216-2AD23-0XA0  and analog module 231 0HF22.

if an input is not used and not "shorted", what is the result?

* most cases:
  no effect

* bad case scenario:
  floating input influences other analog channels

* worse case scenario:
  floating input beyond limits damages the measurement channel

Swap some of the channels around and see if the problem is local to the PLC or from the field. But first make measurements with a hand-held meter to check DC and AC (!) voltages in relation to DC common.