SEW-Eurodrive MOVIDRIVE compact MCH41A, System Manual

Page: 389 / 436

System Manual – MOVIDRIVE® compact Drive Inverters
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Starting up the inverter with INTERBUS (MCH42A)
Startup
Reading
IPOS
plus®
variables /
parameters via
MOVILINK
®
The inverter offers special parameter access via the MOVILINK
®
parameter channel for
universal read access to all inverter data (parameters, IPOS
plus®
variables, IPOS
plus®
program code, etc.). The following section illustrates the mechanism by which, for
example, IPOS
plus®
variables can be read via the parameter channel. A two-step
procedure is required for this purpose:
• Writing the MOVILINK
®
parameter channel with the command "Read IPOS variable
H0"
• Reading the MOVILINK
®
parameter channel
The MOVILINK
®
parameter channel (acyclic) can be used via index 8299 dec
(206B hex).
Example
Reading the IPOS
plus®
variable H0 = Index 11000 dec (2AF8 hex)
Refer to the "MOVIDRIVE
®
Fieldbus Unit Profile" manual for a detailed description of
the MOVILINK
®
parameter channel.
Once the positive "Write_Confirmation (+)" has been received, read access takes place
on the MOVILINK
®
parameter channel, which means data that has been read during the
previous read operation defined by "Write_Request" are read into the interface module.
Word Meaning Coding (hex)
1 Command_Code = Write_Request 00 82
2 Parameter_Count 00 07
3 Invoke_ID Comm._Reference 00 02
4 Index = MOVILINK
®
parameter channel 206B
5 Subindex Length 00 08
6 Data [1] = Management byte Data [2] = Reserved 31 00
7 Data [3/4] = Index (e.g. IPOS
plus®
variable) 2A F8
8 Data [5] Data [6] 00 00
9 Data [7] Data [8] 00 00
Bits 15 ... 8 7 ... 0
Word Meaning Coding (hex)
1 Command_Code = Read_Request 00 81
2 Parameter_Count 00 03
3 Invoke_ID Comm._Reference 00 02
4 Index = MOVILINK
®
parameter channel 206B
5 Subindex - 00 00
Bits 15 ... 8 7 ... 0
0 0
I