User's Manual

COBALT UHF-SERIES CHAPTER 6: ETHERNET/IP INTERFACE
PAGE 98 OF 140
6.8 VERIFYING DATA EXCHANGE WITH
RSL
OGIX 5000
At this point, communication between the Cobalt and the PLC should be properly
configured and a connection established. You can verify the exchange of information
between devices using RSLogix 5000.
Figure 6-5: RSLogix 5000
6.8.1 Ethernet/IP Handshaking
To ensure that messages to and from the Cobalt are properly delivered and received,
a handshaking mechanism has been implemented that uses a pair of dedicated
words in the exchange. The first two words in each Controller Tag are dedicated to
handshaking.
When new information is generated, the producing device (Data Producer) will
increment a counter in one of the Controller Tags. After identifying the new data, the
consuming device (Data Consumer) will copy that same counter value to a different
Controller Tag location, which lets the Data Producer know that the information has
been processed by the Data Consumer.