Beckhoff EPP3504-0023 Short Manual page 149

Commissioning on EtherCAT Master
Fig. 86: Selecting several PDOs simultaneously: activate "Continuous" and "All types"
Note that the "Continuous" checkbox was also activated. This is designed to allocate the bits contained in the
byte of the "nEL2008_value" variable sequentially to all eight selected output bits of the EL2008 Terminal. It
is thus possible to subsequently address all eight outputs of the terminal in the program with a byte
corresponding to bit 0 for channel 1 to bit 7 for channel 8 of the PLC. A special symbol ( ) on the yellow or
red object of the variable indicates that a link exists. The links can also be checked by selecting "Goto Link
Variable" from the context menu of a variable. The opposite linked object, in this case the PDO, is
automatically selected:
Fig. 87: Application of a "Goto Link Variable", using "MAIN.bEL1004_Ch4" as an example
The process of creating links can also be performed in the opposite direction, i.e. starting with individual
PDOs to a variable. However, in this example, it would not be possible to select all output bits for the
EL2008, since the terminal only makes individual digital outputs available. If a terminal has a byte, word,
EPP3504-0023 Version: 1.2 149