kevinlin_5

 Hi, Ankurgamit,

Actually I have tried using mov function to move the AI input value from IW6 to a memory address MW100, and I also monitor IW6:P and MW100:P in the watch table, but the values are all 128. I was quite confuse about this, if the value can be monitored, then it should be changed, if cannot, why there was a value of 128?

Thanks.

ANKURGAMIT

 

kevinlin_5

Dear All,

I may like to ask a question about the AI module input value monitoring. The AI module I was using is AI 4xU/I 2-wire ST_1 (6ES7 134-6HD00-0BA1). Input address of this AI module was set to 6 to 13. All the 4 input channels are configure in the PLC tags as an integer, and their corresponding addresses are IW6, IW8, IW10, and IW12. A voltage generator was directly connected to channel 0 of the AI module, and measurements of all the 4 input channels are set to 0-10v voltage. When I monitor the input value of IW6 at the watch table, it shows 128. When I change the input voltage value at the voltage generator, the monitor value of IW6 was not changing and kept at 128.

Can anybody help to point out where might be the problem?

BTW, I may also like to ask, since the real type tag used 4 byte of addresses, and the AI module only use 8 byte, is that means I can only use 2 channel of the AI module if I want to define the AI input as a real number? 

Thanks.

 try for first put that %IWXXX:P to some WORD area, f.ex.%MW40, after that watch that %MW40. There you can see it's value.

please refer below topic this may help you,

https://support.industry.siemens.com/tf/ww/en/posts/s7-300-analoge-count/142271/?page=0&pageSize=10 

 COUNT VALUE 128 is normally  as 0 count compare to 27648

(it may hardware error for little count)

so you should check your hardware configuration ,wiring ,and terminate  module is placed or not,

if problem remain same continue you should check it separately with plc with use of dummy project.

Hello Kevinlin,

if you want watch that AI value, pls after MOVE that f.ex. IW6 value to MW100, in watch table insert only MW100, you don't need Peripheral :P with that. Then MW100 will show you Value of moved AI. Probably monitoring right Peripheral values are not possible, you must move that value to another memory location and monitor via this memory areas.

so the software configuration is ok kevinlin.

check the AI hardware wiring. is your et200 station is communicating with plc?

any bus fault? or fault led in cpu or in et200 interface module?

 Hi, Karthik,

Communication was OK, all the LEDs are green, no fault was reported.

Thanks.

karthik live

so the software configuration is ok kevinlin.

check the AI hardware wiring. is your et200 station is communicating with plc?

any bus fault? or fault led in cpu or in et200 interface module?

Hi Kevinlin,

check hardware installation and wirings. if you found ok, then try with new module.

Hello Kevinlin_5,

                          Based On Your Module Wiring , I have Enclosed the Diagram . Plz Find it .

If I could help you, You can always use Thank and Rate buttons :)

Suggestion was helpful? Thanks to rate it

 Regards,

Arasan..