Hardy HI 6500 Series - Manual (Page 82)

72 Chapter 5
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The EIP diagnostic parameters count the number of packets of various types received
(in) or transmitted (out).
TCP is used for most explicit or unconnected messages. The usual sort of EtherNet/IP
connection is one in which packets are sent and received at some specified RPI (requested
packet interval). These packets are sent and received via UDP and show up in the "UDP
IO" count variables. It takes a few TCP packets to set up this connection, and these packets
show up in the TCP counters.
Finally, there are some older PLCs like the 1746 and PLC-5 that lack a full implementation
of EtherNet/IP, and cannot support a cyclic connection. These PLCs sometimes use an older
protocol called PCCC, and the PCCC variables count the number of PCCC messages
received or sent.
Ethernet TCP/IP Commands and Parameters
Enable DHCP Parameter
TCP in 24
TCP out 22
UDP out 9
UDP in 9
UDP IO in 0
UDP IO out 0
PCCC in 0
PCCC out 0