Cyclic Transmission Function - Mitsubishi Electric MELSEC iQ-R Series User Manual

12.2

Cyclic Transmission Function

This function establishes a connection to periodically perform data communications between the CC-Link IE TSN Plus module
and the EtherNet/IP device.
Function overview
In Class1 communications, the device on one end opens first a logical connection line called a "connection" for the device on
the other end to perform data communications.
In addition, the originator can open multiple connections for the same target.
(1)
(4)
(1) Originator (scanner)
(2) Target A (scanner)
(3) Target B (adapter)
(4) Connection settings for connections No.1 and No.2 are configured in "EtherNet/IP Configuration".
Connection settings
Connection settings are settings for the originator to perform data communications with the target.
A connection to be opened is managed with a connection number (unique value for the own module to manage
communications) and the connection settings corresponding to that number.
For connection settings, the following items can be set individually for each connection.
*1
Item
IP address
Data Size
RPI
Timeout Multiplier
Connection type (input mode/output mode)
Trigger Type
Application Type
Instance ID
Tag Name
*1 For each item, set the engineering tool "EtherNet/IP Configuration" or buffer memory.
Page 117 "EtherNet/IP Configuration" window
Page 498 Class3/UCMM communication area
*2 If data is not received within the period of time in the following calculation formula, a connection timeout occurs.
RPI (communication cycle)  Timeout Multiplier
Example: When RPI is 100ms and Timeout Multiplier is  8, if data is not received within 800ms, a connection timeout occurs.
*3 When (RPI (communication cycle)  Timeout Multiplier) is greater than (timeout time on the socket communications side), even if a
timeout in this setting does not occur, the connection may be closed due to the occurrence of a timeout on the socket communications
side.
Depending on the application type, data sending can be set only for input or output.
When a connection set for only one of the input and output directions is used, a packet for checking the
communication status (heartbeat) is sent for the unset direction to prevent the occurrence of timeouts.
12 FUNCTIONS
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12.2 Cyclic Transmission Function
Connection No.1 (Class1 tag communications)
Connection No.2 (Class1 instance communications)
Description
Set the IP address to identify the external device.
Set the data size for communications.
Set the interval from the time data is sent until the next data is sent.
Set the time until a connection timeout occurs.
Set the method for data sending between the originator and the target. ( Page 259 Connection type)
Set the data sending timing.
Only Cyclic is supported for the trigger type in the connection settings. (Data is sent at the set RPI interval.)
Set control related to data communication. ( Page 261 Application type)
In "EtherNet/IP Configuration", the application type is committed when a connection is added.
Set a value for identifying data used for cyclic transmission.
Specify which data held by the external device is accessed. ( Page 264 Instance ID and tag name)
(2)
(3)
*2*3