GlossaryivTerm DescriptionNormal packet andlarge packetThe packet whose size is within 510 bytes is called normal packet. The packet whosesize is 511 bytes to 1444 bytes is called larget packet.The maximum communication performance varies according to the data size used forcommunication.Performance index of FP0HFor 510 bytes or less: Max. 5000 ppsFor 511 bytes or more: Max. 2500 ppsProtocol used forcyclic communication The cyclic communication is performed using UDP. The used port number is 2222.HeartbeatFor "Input Only" or "Listen Only", a packet called heartbeat whose data size is zero issent from the originator (FP0H). For the RPI of the heartbeat, the value 16 times of theRPI of transmitted data from a target is automatically applied.The heartbeat is used for confirming the continuation of the connection on the targetside. It is used for detect the timeout.Forward open This is a command for opening the connection of EtherNet/IP and sent using TCP. Theused port number is 44818.Large forward open This is a command for opening the connection when sending/receiving data whosesize is larger than 511 bytes.RUN/IDLE bitOperation state flag (RUN/IDLE) sent by connected devices in cyclic communication.RUN ： 1IDLE ： 0When the RUN/IDLE bit of the originator does not change to RUN, the target may notoperate properly. For details, refer to "5.2.3 RUN/IDLE Bit".• Do not use "2222" and "44818" for the port numbers set to the connectionsof Ethernet communication.
