Beckhoff EL34 Series Documentation page 120

Commissioning
Fieldbus Components → EtherCAT Terminals → EtherCAT System documentation → EtherCAT basics →
Distributed Clocks
6.2.7.1 Detailed description of Process Data tab
Sync Manager
Lists the configuration of the Sync Manager (SM).
If the EtherCAT device has a mailbox, SM0 is used for the mailbox output (MbxOut) and SM1 for the mailbox
input (MbxIn).
SM2 is used for the output process data (outputs) and SM3 (inputs) for the input process data.
If an input is selected, the corresponding PDO assignment is displayed in the PDO Assignment list below.
PDO Assignment
PDO assignment of the selected Sync Manager. All PDOs defined for this Sync Manager type are listed
here:
• If the output Sync Manager (outputs) is selected in the Sync Manager list, all RxPDOs are displayed.
• If the input Sync Manager (inputs) is selected in the Sync Manager list, all TxPDOs are displayed.
The selected entries are the PDOs involved in the process data transfer. In the tree diagram of the System
Manager these PDOs are displayed as variables of the EtherCAT device. The name of the variable is
identical to the Name parameter of the PDO, as displayed in the PDO list. If an entry in the PDO assignment
list is deactivated (not selected and greyed out), this indicates that the input is excluded from the PDO
assignment. In order to be able to select a greyed out PDO, the currently selected PDO has to be deselected
first.
Activation of PDO assignment
ü If you have changed the PDO assignment, in order to activate the new PDO assignment,
a) the EtherCAT slave has to run through the PS status transition cycle (from pre-operational to
safe-operational) once (see Online tab [} 118]),
b) and the System Manager has to reload the EtherCAT slaves
( button for TwinCAT 2 or
PDO list
List of all PDOs supported by this EtherCAT device. The content of the selected PDOs is displayed in the
PDO Content list. The PDO configuration can be modified by double-clicking on an entry.
Column Description
Index PDO index.
Size Size of the PDO in bytes.
Name Name of the PDO.
If this PDO is assigned to a Sync Manager, it appears as a variable of the slave with this
parameter as the name.
Flags F
M
SM Sync Manager to which this PDO is assigned. If this entry is empty, this PDO does not take
part in the process data traffic.
SU Sync unit to which this PDO is assigned.
120
button for TwinCAT 3)
Fixed content: The content of this PDO is fixed and cannot be changed by the
System Manager.
Mandatory PDO. This PDO is mandatory and must therefore be assigned to a
Sync Manager! Consequently, this PDO cannot be deleted from the PDO
Assignment list
Version: 1.5 EL34xx