10 • Modes
Application note
A500680e
4 Modes
Depending on the amount of data to be received and transmitted the module may be used either in
mapped mode (small amount of data, less than app.40 byte) or transparent mode.
4.1 Mapped mode
In mapped mode the data will be directly available by the process image of the module. No need
for a function block to receive or transmit data once the module is configured appropriately. This
may be done by using Wago-IO-Check.
If the configuration should be done by the CoDeSys application the function blocks
CAN_FullConfig and CAN_Communication have to be used.
If the module size and acyclic channel size is configured correct, the acyclic channel will show
MBX_OK while the CAN channel will show MBXERR_DENIED (OK since the CAN channel is
not available in mapped mode).
An additional function block CAN_FullConfigCheck allows to check module settings by compar-
ing the module internal CRC against the calculated CRC from variable tConfigData. A configura-
tion download may be performed depending on the result of the CRC check.