Siemens SIMATIC PN/CAN LINK

Functions
5.1 CANopen
SIMATIC PN/CAN LINK
42 Operating Instructions, 03/2022, A5E39895388-AC
5.1.1.9 Conversion of data formats between PROFINET and CANopen
The process data are automatically converted from PROFINET to CANopen data format and
vice versa according to the configured data type.
The S7 controller interprets data in the "Big Endian" format. CANopen and the processors
used in the PN/CAN LINK use the "Little Endian" format. This means the sequence of bytes is
adjusted for all data types that exceed 1 byte.
Conversion takes places prior to writing the process data received by the S7 controller to the
OD or before the process data read from the OD are sent to the S7 controller.
The following table provides an overview of the data types supported by the PN/CAN LINK
and their conversion.
Conversion
PROFINET data type
CANopen data type
Conversion
Integer 8
INTEGER 8
None
Integer 16
INTEGER 16
Byte sequence is automatically
converted.
Integer 32
INTEGER 32
Integer 64
INTEGER 64
Unsigned 8
UNSIGNED 8
None
Unsigned 16
UNSIGNED 16
Byte sequence is automatically
converted.
Unsigned 32
UNSIGNED 32
Unsigned 64
UNSIGNED 64
Float 32 / float
REAL 32
Float 64 / double
REAL 64
Bool
Bool
None
Note
The "Bool" data type is only available in PN/CAN LINK 2.0.