Lenze PLC Designer PLC Designer (R3-1) - Manual (Page 1110)

L-force | PLC Designer
Devices
1108 DMS 4.1 EN 03/2011 TD29
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17.1.2 Adjusting the cycle time of access to the I/O compound module
In the "L-force Controller" device, a bus cycle task for processing all connected field
buses and for the I/O compound module connected via the backplane bus is selected
centrally.
This selection which is made is a pre-assignment and can be overwritten in the bus
master nodes (EtherCAT Master, CANopen_Manager, IOSliceContainer, ....).
If the backplane bus is to be operated with a shorter cycle time than selected in the "L-
force Controller" device, a faster task can be selected in 'IOSliceContainer'.
Example: Different cycle times
In PLC Designer, a processing task for formation of the I/O image is first created for the
PLC. A different possibility, however, is to specify a so-called bus cycle time for each
individual I/O compound module, whereby the process image for these I/O compound
modules is created in this time.
All in all, three different tasks can be defined for I/O compound module processing.
The restriction to three tasks is due to the nature of the system and is prescribed by the
backplane bus specification. The backplane bus controller uses two internal bus cycle
groups for each task. One for input signals and one for the outputs. There is a total of 6
groups available.