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Configuration via SIMATIC Manager
CAN-CBM-DP
Software Manual Rev. 2.0
39
2. Start Transmission Command by Writing the 16 Bytes of the Communication Window
Byte of
Communication
Window
Contents
Example here
[hex]
1
high byte of CAN-identifier (identifier bit [15] 10...8)
low byte of CAN-identifier (identifier bit 7...0)
00
12
2
3
bytes 2 and 3 always ‘0’ for 11-bit identifier
00
00
4
5
6
7
8
9
10
11
data byte 0
data byte 1
data byte 2
data byte 3
data byte 4
data byte 5
data byte 6
data byte 7
00
01
02
03
04
05
06
07
12
data length for transmission commands
08
13
PLC-loop counter
8-bit counter
14
sub-command (always set to ‘0’)
00
15
command ‘transmit data’
01
The data bytes 00, 01, 02, 03, 04, 05, 07 are transmitted on Tx-identifier 0012 hex.
In order to acknowledge the execution of the command a read access to byte 13 of the
Communication Window should follow. It has to have the same value of the PLC-loop counter as
when the command was called.