Lenze EtherCAT control technology - Manual (Page 60)

Control technology | EtherCAT communication manual
Commissioning of the system
Detailed commissioning steps
60
L
DMS 3.1 EN 01/2011 TD17
7.2.7.3 Setting up a DC synchronisation
 Motion applications always require DC synchronisation.
 DC synchronisation can also be used for Logic applications.
 To be able to use the DC function, the first slave connected to the EtherCAT master (IPC)
must be DC-master-capable.
The first EtherCAT node connected to the IPC is the DC master which provides the other
bus nodes (including the IPC) with the exact time.
 In the arrangement of the slaves following then, DC-capable and non-DC-capable
devices can be mixed.
 For field devices with communication modules (e.g. Servo Drives 9400 or Inverter
Drives 8400), a synchronisation source must be selected via code C01120. If the DC
setting and the selection of the sync source differ from each other (C01120 = MXI1 and
"DC nused"), the devices cannot be set to the Operational state.
 For Servo Drives 9400, code C13892/C14892 = 1 must be set (process data mode =
"deterministic mode").

Note!
The manual configuration of the slave DC features requires a detailed
knowledge of EtherCAT and the field device. Thus, DC settings should only be
made by experts.
A faulty configuration can cause maloperation and negative influences on the
system.