Diagnose Input/Output Module S7 plc

Hi Everone,
I want to know how we Diagnose Digital Input/Output module in S7 300 plC.
Cpu 315-2dp
Input module SM 321-32DIX24v
Output module SM 322-32DOX24V
Any power failure of I/O module but CPU do not Response how we get Alarm and Diagnose failure of I/O module.thanks

AOA,
1. you have to enable the diagnostic of the module
2.call the fb125 in ob82,ob86,ob1.the instance DB of the FB125 has all the info.


pls find the document and sample program


click here for FB125

You can also read a module information list with SFC51 (RDSYSST) which you will find in standard library
under system function blocks. With SSL-ID W#16#0991 you would also get the information you need I
think.

Thanks for reply i will check it.