Filter subscribers

Depending on the configuration of the Ethernet network, the EP6601-0002 used in the network will receive a low or high number of Publisher telegrams. At startup, the EP6601-0002 is configured by the EtherCAT master to the Subscriber variables to be received by it: Source AMS Net ID and ID of the variables are loaded into the CoE for each Subscriber. The CoE objects 0x60n0:01 and 0x60n0:02 then contain the AmsNetId and VariableID to be checked. The EP6601-0002 can therefore filter on the incoming Publisher ID and compare it with its own Subscriber ID. For this purpose the Publisher variables contained in the Ethernet frames received are disassembled and checked individually.

If an incoming Subscriber

• corresponds to a configured AMS Net ID and Variables ID, then the contents are transferred to EtherCAT via PDO.
• does NOT correspond to the above, then the contents are transferred by default to the acyclic mailbox interface for transmission to the master.

This is the standard setting of the EP6601-0002.

The second way generates a high acyclic EtherCAT transport load, because Subscribers received by the EP6601-0002 are transported that should not be transported by this EP6601-0002. For this reason the Subscriber filter can be enabled by the CoE entry 0xF800:02 = 0x0100 (bit 8 = TRUE). The Subscriber data that do not correspond to the AmsNetID/Variables ID filter are then discarded in the terminal and are not transferred to the mailbox.

Filter Subscribers It is recommended to enable the Subscriber filter. As the EP6601-0002 is reinitialized with every INIT-OP transition, the CoE entry mentioned must be set in the StartUp list.

Note: bit counting in this documentation starts at 0: value.0, value.1, ...