Lenze DDS System bus CAN for PLC Bedienungsanleitung PDF herunterladen (Seite 31)

System bus (CAN) for Lenze PLC devices

General information

2−19

PLC−Systembus EN 2.0

2.8 Free CAN objects

If many nodes are connected to the system bus (CAN), it may occur that the CAN objects

(CAN1_IO ... CAN3_IO) which are fixedly integrated in the PLC are not sufficient for the

communication intended, and further CAN objects are required.

By using the functions/function blocks of the LenzeCanDrv.lib function library, so−called "free CAN

objects" can be added to the fixedly integrated CAN objects.

(^ 10−2)

Characteristics of the free CAN objects

Free CAN objects

User data per object 1 ... 8 byte

Intended use Transmission of parameter and process data

Transmission modes · Event−controlled transmission

· Time−controlled transmission

· Time−controlled transmission with superimposed event control

· Forced transmission

Range for identifiers Transmission and reception identifiers can be allocated in the range of 0 ... 2047, but they have to differ from the

identifiers of the integrated CAN objects.

Note!

The free CAN objects are processed via a so−called transmit request memory by the operating

system, i. e. the transmission process is not carried out immediately when the L_CanPdoTransmit

FB is called, but is effected in a delayed manner.

(^ 10−8)

The transmission and reception jobs of the free CAN objects are not linked to the process image.

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Lenze DDS System bus CAN for PLC Bedienungsanleitung Seite 31