Mechanisms For Processing Parameters Via The Profibus - Siemens Simovert 6SE70 Series Operating Instructions Manual

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A total of five PPO types are defined:
PKW section
PKE IND
st nd
1 2 3
word word word
PPO1
PPO2
PPO3
PPO4
PPO5
PKW: Parameter ID value
PZD: Process data
PKE: Parameter identifier
The acyclic channel MSCY_C2 (see diagram above) is used exclusively for the start-up and servicing of
DriveMonitor.
4.5.2.1

Mechanisms for processing parameters via the PROFIBUS:

The PKW mechanism (with PPO types 1, 2 and 5 and for the two acyclic channels MSAC_C1 and MSAC_C2)
can be used to read and write parameters. A parameter request job is sent to the drive for this purpose. When
the job has been executed, the drive sends back a response. Until it receives this response, the master must
not issue any new requests, i.e. any job with different contents, but must repeat the old job.
The parameter section in the telegram always contains at least 4 words:
Parameter identifier
PKE
Details about the telegram structure can be found in Section 4.5.6, "Structure of request/response telegrams".
The parameter identifier PKE contains the number of the relevant parameter and an identifier which
determines the action to be taken (e.g. "read value").
The index IND contains the number of the relevant index value (equals 0 in the case of nonindexed
parameters). The IND structure differs depending on the communication mode:
Definition in the PPOs (structure of IND with cyclical communication via PPOs)
-
Definition for acyclical channels MSAC_C1 and MSAC_C2 (structure of IND with acyclical communication)
-
The array subindex (referred to simply as "subindex" in the PROFIBUS profile) is an 8-bit value which is
transferred in the high-order byte (bits 8 to 15) of the index (IND) when data are transferred cyclically via
PPOs . The low-order byte (bits 0 to 7) is not defined in the DVA profile. The low-order byte of the index word is
used in the PPO of CBP2 to select the correct number range (bit7 = Page Select bit) in the case of parameter
numbers of > 1999).
In the case of acyclical data traffic (MSAC_C1, MSAC_C2) the number of the index is transferred in the low-
order byte (bits 0 to 7). Bit 15 in the high-order byte is used as the Page Select bit. This assignment complies
with the USS specification.
Index value 255 (request applies to all index values) is meaningful only for acyclical transmission via MSAC_C1.
The maximum data block length is 206 bytes with this transmission mode.
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PWE PZD1 PZD2
STW1 HSW
ZSW1 HIW
rd th st nd
4 1 2
word word word
IND: Index
PWE: Parameter value
STW: Control word
Index Parameter value 1
IND PWE1 (H word)
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PZD section
PZD3 PZD4 PZD5 PZD6
rd th th th
3 4 5 6
word word word word
ZSW Status word
HSW: Main setpoint
ISW: Main actual value
Paramter value 2
PWE2 (L word)
Rectifier/Regenerating Unit
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PZD7 PZD8 PZD9 PZD
10
th th th
7 8 9 10
word word word word
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Operating Instructions
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