WAGO I/O-SYSTEM 750, Technical Description

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92 • CANopen
Network Communication
WAGO-I/O-SYSTEM 750
CANopen
4. column Data Data bytes of the CAN message
A maximum of 8 data bytes can be transmitted in a CAN mes-
sage. The individual bytes are separated by spaces. Entries
having the value XX have no meaning, but must be existing.
The values should be zeroed for a better understanding.
Entries in the reply from the bus coupler having the value DD
contain data, which are dependent on the configuration.
4.3.1.2.2.1 Example 1:
Read Index 0x1000 Sub-Index 0; Device Type
Index 0x1000 returns 4 bytes. The expedited transfer mode is used for trans-
mission.
Direction CAN Id Frame Type Data byte 0-7
M->BK 0x601 D 0x40 00 10 00 XX XX XX XX
BK->M 0x581 D 0x43 00 10 00 91 01 DD 00
Result:
Data bytes 4 and 5: 91 01 Sequence Low Byte, High Byte rotation:
0x0191 = 401 Device Profile Number
Data bytes 6 and 7: DD 00 Sequence Low Byte, High Byte rotation
4.3.1.2.2.2 Example 2:
Read Index 0x1008 Sub-Index 0; Manufacturer Device Name
Index 0x1008 returns more than 4 bytes. The normal transfer mode is used for
transmission in which case 2 messages per mode are transmitted.
Direction CAN Id Frame Type Data byte 0-7
M->BK 0x601 D 0x40 08 10 00 XX XX XX XX
BK->M 0x581 D 0x41 08 10 00 07 00 00 00
M->BK 0x601 D 0x60 XX XX XX XX XX XX XX
BK->M 0x581 D 0x01 37 35 30 2D 33 33 37
Result:
The first reply from the bus coupler informs the master of the number of data
to be transmitted (0x00000007 Byte). In the second message, the bus coupler
supplies the article number in the ASCII format (hex representation)
„750-337“.