SEW-Eurodrive MOVIDRIVE compact MCH41A, System Manual

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386
System Manual – MOVIDRIVE® compact Drive Inverters
10
Starting up the inverter with INTERBUS (MCH42A)
Startup
Reading a drive
parameter The "Read" service is used for reading a drive parameter (with index
≤
8800). All drive
parameters are generally 4 bytes long (1 double word).
Example
Reading P130 ramp t11 UP CW (index 8470dec = 2116hex)
Once you have sent this service, you should receive the positive message
"Read_Confirmation".
The parameter data are represented in Motorola format (Simatic format) as follows:
00 00 07 D0 hex = 2000 dec(= 2000 ms ramp)
Refer to the appendix in the "MOVIDRIVE
®
Fieldbus Unit Profile" manual for more
information on coding drive parameters.
The table shows the "Value for parameter too great" return code, by way of example.
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 21 16
5 Subindex - 00 00
Bits 15 ... 8 7 ... 0
Word Meaning Coding (hex)
1 Message_Code = Read_Confirmation (+) 80 81
2 Parameter_Count 00 05
3 Invoke_ID Comm._Reference 00 02
4 Result (+) 00 00
5 - Length 00 04
6 Data [1] Data [2] 00 00
7 Data [3] Data [4] 07 D0
Bits 15 ... 8 7 ... 0
Data [1] = High Byte Data [2] = Low Byte Data [3] = High Byte Data [4] = Low Byte
00 hex 00 hex 07 hex D0 hex
Word Meaning Coding (hex)
1 Message_Code = Read_Confirmation 80 81
2 Parameter_Count 00 03
3 Invoke_ID Comm._Reference 00 02
4 Error_Class Error_Code 08 00
5 Additional_Code 00 10
Bits 15 ... 8 7 ... 0
0 0
I