INFICON T-Guard Leak Detection Sensor Interface description - Manual (Page 35)

Profibus-DP Protocol
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5.3 Acyclic Data Transfer
Important Note:
If you want to use acyclic data transfer with Profibus, you must use a Profibus
master which supports DPV1 data transfers.
A Profibus master which supports DPV0 only, can only use cyclic data
transfer.
5.3.1 Addressing Rules for Acyclic Access
Fieldbus Rule
Profibus
ADI = slot * 255 + index +1
slot = (ADI-1) / 255
index = (ADI-1) MOD 255