Lenze 2131 - Example 2: Write Parameter; Process Data

Parameter setting
6-9
 BA2131EN
6.3.4 Example 2: Write parameter
Task
The heatsink temperature (value = 43 C) C0061 is to be read by the controller.
Job (byte 1/service)
Bit 0-2 = 2 Writ e j ob (xxxx x001)
Bit 3 = 0 Re se rved (xxxx 0001)
Bit 4-5 = 3 Data length 4 byte (xx11 0001)
Bit 6 = X Handshake changes frequently (xx11 0001)
Bit 7 = 0 Only relevant with response (0x11 0001)
SUBINDEX (byte 2)
Subindex = 0, as there is not subindex under code C0061.
INDEX (byte 3 + 4)
Index calculation:
Index = 24575 - code number
Index = 24575 - 61 = 24514 = 5FC2
hex
Response to drive
Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6 Byte 7 Byte 8
Service Subindex Index
High byte
Index
Low byte
Data 4 Data 3 Data 2 Data 1
0x11 0001 0 5F C2 00 00 00 00
Response of the controller when no fault occurs
Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6 Byte 7 Byte 8
Service Subindex Index
High byte
Index
Low byte
Data 4 Data 3 Data 2 Data 1
0x11 0000 0 5F C2 00 06 8F B0
Index of the read request = 5FC2
hex
Data1todata4=43C x 10000 = 430000 = 00 06 8F B0
6.4 Process data
Process data are data memories in which several parameters for a new parameter - the process
data - are summarized for fast transmission. The host has direct access to the process data. In the
PLC, for instance, the data are directly assigned to the I/O area. These process data are cyclically
exchanged between the controller and the master. They are subdivided into
l Process output data (PO data)
l Process input data (PI data)
Herethedataflow starts fromthemaster, i.e.thePOdataofthemasterarePIdatafor thecontroller.
The controller gets the control information from the master and returns status information.
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