System bus (CAN) with Ser vo PLC & Drive PLC
General information
2-15
l PLC-Systembus EN 1.1
2.7 Free CAN objects
If many participants are connected to the system bus (CAN), the CAN objects (CAN1_IO ...
CAN3_IO)permanently integrated in the PLC might not be sufficient for the planned communication
and additional CAN objects might be required.
The functions/function blocks of the LenzeCanDrv.lib functionlibrarycanbeusedtoadd”freeCAN
objects” to the permanently integrated CAN objects.
Properties of the free CAN objects
Free CAN objects
User data per object 1 ... 8 bytes
Application Transmission of parameter and process data
Transmission methods • Event-controlled transmission
• Time-controlled transmission
• Time-controlled transmission with overlapping event control
• Forced transmission
Identifier area Transmit and receive identifiers can be a ssigned in the are a from 0 ... 2047, they must, however, not be identical
with the identifiers of the integrated CAN objects.
Note!
The operating system processes the free CAN objects via a so-called transmission request
memory, i.e. data are not immediately transmitted when the L_CanPdoTransmit function block is
called, but with a delay.
(^ 9-1)
The transmit and receive requests of the free CAN objects do not depend on the process image.
Functions
Detailed information about the functions of the LenzeCanDrv.lib function library can be found in
chapter 8.
(^ 8-1)
Function blocks
Detailed information about the function blocks of the LenzeCanDrv.lib function library can be found
in chapter 9.
(^ 9-1)
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