Details of Explicit Exchange Objects for an Ethernet Function

Overview

The following table objects are not integrated into the IODDTs. Reading is performed by a READ_STS call.

Explicit Exchange Objects

Address	Type	Access	Meaning
%MWr.m.c.7	INT	R	number of received messages on the Ethernet port per second (BW_NB_MSG_IN)
%MWr.m.c.8	INT	R	number of useless messages filtered by the Ethernet port per second (BW_NB_MSG_FILTER)
%MWr.m.c.9	INT	R	number of messages dropped by the Ethernet port per second (BW_NB_MSG_DROP)
%MWr.m.c.11	INT	R	maximum number of useless messages filtered by the Ethernet port per second (BW_MAX_MSG_FILTER)
%MWr.m.c.12	INT	R	maximum number of messages dropped by the Ethernet port per second (BW_MAX_MSG_DROP)
%MWr.m.c.13	INT	R	maximum number of multicast messages received per second (BW_MAX_MSG_MC)
R = read only

multicast

Multicast communications send packets from a single source to a predefined multicast group of network destinations, usually through a router or switch. Sending messages to just the group members relieves unnecessary traffic created by broadcast communications and does not require a separate unicast transmissions to each recipient. (See broadcast, unicast, GMRP.)