Siemens SIMATIC PN/CAN LINK

Functions
5.1 CANopen
SIMATIC PN/CAN LINK
Operating Instructions, 03/2022, A5E39895388-AC
41
Figure 5-2 Example PN/CAN LINK transparent
Submodule Input data (bytes) Output data (bytes) Status byte input
data
Status byte output
data
PN/CAN LINK (rack 0,
slot 0)
0
0
1
1
Interface
0
0
1
1
Port 1
0
0
1
1
Port 2
0
0
1
1
CAN network
1
1
2
2
Transmit message_1
0
8
1
1
Transmit message_2
0
4
1
1
Receive message_1:
8
0
1
1
Receive proxy_1
13
1
2
2
Transmit proxy_1
1
13
2
2
Sum
23
27
13
13
In this example, the following values are calculated:
• Net data: 23 bytes for input data and 27 bytes for output data
• Gross data: 36 bytes for input data and 40 bytes for output data
Acyclic data exchange
The PN/CAN LINK provides 16 data records on the PROFINET side of the PN/CAN LINK which
the S7 user program can access with the help of the acyclic PROFINET IO services RDREC
(Read data record) and WRREC (Write data record).
Detailed information can be found under Acyclic data exchange between controller and
PN/CAN LINK (Page 49).