Ethernet/IP and PCCC Protocols
Ethernet/IP and PCCC protocols rely on CIP protocol to establish communications and exchange data. CIP protocol, in turn, utilizes TCP/
IP.
In addition, Ethernet/IP implements I/O messaging. I/O messaging allows two devices, iVu sensor and the PLC, to continuously syn-
chronize data sets between each other. These data sets are called Input and Output assemblies. iVu device consumes PLC output as-
semblies, and produces PLC input assemblies. This exchange occurs continuously, and the rate specified by the RPI (requested Packet
Interval) value.
I/O messaging is based on UDP/IP, and utilizes Multicast addressing when sending PLC input assemblies. It is the default mode of
operation for I/O messages in PLCs. Newer PLCs also support Unicast (direct) addressing for PLC input assemblies, but need to be
specially configured.
Because I/O messaging uses IDP/IP and Multicast, it requires special, managed switches, and customized switch configuration. Man-
aged switches, when properly configured, prevent multicast devices from flooding the network with data. Please consult your IT person to
make sure that you have the correct switch type, and that these switches have IGMP snooping enabled, to allow them to manage multi-
cast groups.
In addition, some switches with built-in firewalls block UDP traffic by default. If this is the case, and if the path between your devices
involves several switches or routers, it is possible that some of them might block the UDP traffic necessary for I/O messages. Please
consult your IT person to verify that your network is configured correctly. Also consult Rockwell publications ENET-AP001D-EN-P,
Ether-
Net/IP Performance , and ENET-SO001A-EN-E, Ethernet Design Considerations for Control System Networks for further informa-
tion on how to configure your Ethernet network for Ethernet/IP.
Establishing CIP and Ethernet/IP I/O communications is a complicated process. There are a number of steps during which an error can
occur. Industrial Protocols log contains a detail description of the communications process, and should be consulted if any errors are
suspected.
A great level of detail is also provided in the log when the I/O connection is established:
iVu Plus BCR User's Manual
Rev. B
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