ixo65

The card is addressed as an analog module in the extended peripheral area.
PY = peripheral byte

That is right !!  The Limit of 127 Bytes ( 0-127 ) is  for DI / DI with Process Image RAM in the CPU and are updated automatically at the beginning and end of cycle.

Further you can go upto 511 with so called Peripheral addresses ( Can be addressed as PY ( Peripheral Byte  or PW ( Peripheral Word ) etc. These have to be read and written to by using specific instructions ( L PY / L PW  / T PY / T PW etc. )

You can mind more details in the Manual :  S5-115U Programmable Controller

Hope this helps

Cheers
Navnag