Method For Accessing Link Devices - Mitsubishi Electric MELSEC iQ-R Series User Manual

Method for accessing link devices

Link devices of a network module can be accessed by any of the following methods:
MELSECWinCPU module
User program
Ò
Ó
Ô
: Accessible, : Not accessible
Access method

Communication by link refresh
(Reading/Writing data from/to
devices)

Communication by direct access
 Communication by using buffer
memory
Excluding rarely used link devices from link refresh device area may reduce link refresh time.
Communication by link refresh
This method is used for communicating data by accessing data with a user program and performing link refresh of a network
module.
Link scan with other stations, link refresh with a network module, and access by a user program are performed
asynchronously.
MELSECWinCPU module
User program
To send/receive data to/from a network module on other stations, access link refresh target devices using a user program.
Perform the following processing in accordance with the refresh cycle of this product.
• Write device values of a MELSECWinCPU module to link devices of a network module.
• Read values from link devices of a network module to devices of a MELSECWinCPU module.
The device access range can be specified in the following settings of a network module. (Manual of a module used)
• Network range assignment setting/Network configuration settings
• Refresh setting
Precautions
Settings for pairing and shared groups are not available in the network range assignment setting and network configuration
setting.
16 NETWORK MODULE ACCESS FUNCTION
156
16.1 Cyclic Transmission
Network module
Link
refresh
Device
Direct access
Buffer memory access
CC-Link IE Controller
Network



Network module
Link
refresh
Device
device
Link
Link
scan
device
Buffer
memory
CC-Link IE TSN



Network module
Link Link
scan
Network module
Link
device
CC-Link



Link
device