System bus (CAN / CAN−AUX) configuration
Setting the boot−up time/cycle time
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EDBCSXA064 EN 3.2
8.4 Setting the boot−up time/cycle time
Boot−up time (C0356/1, C2456/1) setting
In a CAN network without higher−level control (PLC), a bus node (boot−up master) has to
initialise the CAN network. If the 24 V low−voltage supply is switched on, the boot−up time
elapses. After the boot−up time has elapsed, the NMT telegram for initialising the CAN
network is sent by the boot−up master and the process data transfer is started.
ƒ Only valid if C0352/C2452 = 1 (master).
ƒ Normally the Lenze setting (3000 ms) is sufficient.
ƒ State change from "Pre−operational" to "Operational"
Cycle time for process output data (C0356/2...3, C2456/2...3)
Transmission cycle time for the process data objects CAN2...3_OUT (C0356/2...3) or
CANaux2...3_OUT (C2456/2...3) in cyclic operation (without sync)
ƒ Setting "0" = event−controlled data transmission
The output data will only be sent if a value in the output object changes.
Activation delay for process output data (C0356/4, C2456/4)
Delay time for initial transmission of the process data objects CAN2...3_OUT (C0356/4) or
CANaux2...3_OUT (C2456/4) after the CAN bus changes from NMT "Pre−Operational" NMT
state to "Operational"".
After the delay time has elapsed, the process data objects CAN2...3_OUT or
CANaux2...3_OUT will be sent for the first time.
Code Possible settings IMPORTANT
No. Designation Lenze/
{Appl.}
Selection
C0356 CAN time settings for CAN bus
interface X4
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1 CAN times 3000 0 {1 ms} 65000 CAN boot−up time:
Delay time after mains
connection for initialisation
through the master.
2 CAN times 0
CAN2...3_OUT cycle times:
Factor for the task time to send
process data telegram.
0 = event−controlled
transmission
3 CAN times 0
4 CAN times 20 Delay time for initial
transmission of the process data
objects 2 and 3 after the CAN bus
changed to "Operational"
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