Acyclic Data - Siemens SITRANS L Operating Instructions Manual

E.21

Acyclic data

The device supports up to four simultaneous connections by a Class 2 Master (C2
connection). It supports one connection by a Class 1 Master (C1 connection).
In order for a Class 1 Master to read parameters from a device, it needs to know the slot and
absolute index of the parameter.
The parameters are all listed in SIMATIC PDM under Help. If you do not have SIMATIC PDM
you can download the EDD (Electronic Device Description) and reference the HTML help file
directly.
To find the slot and index numbers via SIMATIC PDM, go to Help > Communications, and
select the appropriate block from the list. For each parameter, the slot and the relative index
is listed. For example.
Index
1
Each block has a slot number and an Index Offset value.
Block Name
Physical block
Transducer block
AIFB 1
AIFB 2
To get the absolute index for any parameter, add the Index Offset for the appropriate block to
the relative index for that parameter. The parameter takes the slot number of the block in
which it is located.
For example:
• Parameter Static Revision Number has relative index = 1 and is located on AIFB1.
• It has Absolute Index = 17 (relative index 1 + index offset 16).
• It is located at Slot 1 (the slot number for AIFB 1).
SITRANS LR200 with PROFIBUS PA
Operating Instructions, 07/2021, A5E32337680-AF
AIFB 1
Parameter
Static Revision No.
Slot
0
0
1
2
PROFIBUS communication
E.21 Acyclic data
Datatype
UNSIGNED_INTEGER (2)
Index Offset
16
77
16
16
213