Lenze DDS System bus CAN for PLC - Manual (Page 24)

System bus (CAN) for Lenze PLC devices
General information
2−12
l
PLC−Systembus EN 2.0
2.7.1.2 Command code
Identifier
Command
code
Index
Subindex Data 1 Data 2 Data 3 Data 4
Low byte High byte
Among other things, the command code contains the command to be carried out as well as
information on the parameter data length, and is structured as follows:
Bit 7 (MSB) Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Command Command Specifier (cs) Length e s
Write request 0 0 1 0
00 = 4 bytes
01 = 3 bytes
10 = 2 bytes
11 = 1 byte
1 1
Write response 0 1 1 0 0 0
Read request 0 1 0 0 0 0
Read response 0 1 0 0 1 1
Error Response 1 0 0 0 0 0 0 0
Command code for parameters with 1, 2, or 4 bytes data length:
4 byte data
(32 bit)
2 byte data
(16 bit)
1 byte data
(8 bit)
Command hex dec hex dec hex dec Information
Write Request 23 35 2B 43 2F 47 Send parameter to a node
Write Response 60 96 60 64 60 96 Node response to "write request" (acknowledgement)
Read Request 40 64 40 64 40 64 Request for reading a parameter of a node
Read Response 43 67 4B 75 4F 79 Response to the read request with an actual value
Error Response 80 128 80 128 80 128 Node reports an error with regard to communication
"Error Response" command
In the case of this error, an "Error Response" is generated by the node that is addressed.
·
This telegram in data 4 always contains the value "6", and in data 3 an error code:
Error Response command code Data 3 Data 4 Error message
80
hex
3
6
Access denied
5 Incorrect subindex
6 Incorrect index
C0
hex
8
Job was not edited
(for 8200 vector + FIF module)