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PROFIBUS Optional Board Operating instructions
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If the subindex is transferred with values between 0 and 254 in a request, the
relevant parameter index is transferred in the case of an indexed parameter. For
the meaning of the individual indices of a parameter, please refer to the "Parameter
List" in the converter operating instructions.
In the case of a descriptive element, the number of the required element is
transferred. The meaning of descriptive elements can be found in the PROFIDrive
Profile, version 2.0.
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A value of 255 for the array subindex is a MICROMASTER4-specific, special
function. If the array index is transferred with 255, all the indices of an indexed
parameter are transmitted simultaneously in one data block.
The function is meaningful only for acyclical data exchange mode. The structure of
the transferred data block complies with the USS specification. The maximum data
block size is 206 bytes.
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The bit for parameter page selection functions as follows:
If it is set to 1, an offset of 2000 is applied in MICROMASTER4 to the parameter
number (PNU) transferred in the PKW request before it is passed on.
Parameter name
(acc. to Parameter List)
Corresponding mode
of parameter addressing via PROFIBUS
PNU
[decimal]
PNU
[Hex.]
Bit 15:
PARA PAGE SEL
P0000 - P1999 0 – 1999 0 - 7CF = 0
P2000 - P3999 0 – 1999 0 - 7CF = 1
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The parameter value (PWE) is always transmitted as a double word (32-bit). Only
one parameter value at a time can be transferred in a PPO telegram.
A 32-bit parameter value comprises PWE1 (high-order word, 3
rd
word) and PWE2
(low-order word, 4
th
word).
A 16-bit parameter value is transferred in PWE2 (low-order word, 4
th
word). PWE1
(high-order word, 3
rd
word) must be set to 0 on the PROFIBUS-DP master in this
case.
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