EtherNet/IP Implicit Messaging

Overview

The recommended for EtherNet/IP connections are 1/2 of cycle time. If the resulting RPI is less than 25 ms, the implicit message connections may be adversely affected when the diagnostic features of the BMENOC0301/11 module are accessed through explicit messages or the .

In this situation, these timeout multiplier settings are recommended:

RPI (ms)	Recommended Timeout Multiplier	Connection Timeout (ms)
5	32	160
10	16	160
20	8	160
25	4	100

NOTE: If you use values that are lower than those recommended in the table, the network can consume unnecessary bandwidth. That can affect the performance of the module within the system.

RPI

(requested packet interval) The time period between cyclic data transmissions requested by the scanner. EtherNet/IP devices publish data at the rate specified by the RPI assigned to them by the scanner, and they receive message requests from the scanner at each RPI.

implicit messaging

UDP/IP-based class 1 connected messaging for EtherNet/IP. Implicit messaging maintains an open connection for the scheduled transfer of control data between a producer and consumer. Because an open connection is maintained, each message contains primarily data, without the overhead of object information, plus a connection identifier.

MAST

A master (MAST) task is a deterministic processor task that is run through its programming software. The MAST task schedules the RIO module logic to be solved in every I/O scan. The MAST task has two sections:

IN: Inputs are copied to the IN section before execution of the MAST task.
OUT: Outputs are copied to the OUT section after execution of the MAST task.

DTM

(device type manager) A DTM is a device driver running on the host PC. It provides a unified structure for accessing device parameters, configuring and operating the devices, and troubleshooting devices. DTMs can range from a simple graphical user interface (GUI) for setting device parameters to a highly sophisticated application capable of performing complex real-time calculations for diagnosis and maintenance purposes. In the context of a DTM, a device can be a communications module or a remote device on the network.

See FDT.