IDEC High Performance Series - Manual (Page 564)

Chapter 3
546
External Device Setup Manual
1 O/I Link Communication
1.1 Outline
O/I Link Communication is used for performing 1:N communication (where one PLC is connected to multiple MICRO/I and Touch
units). Construct a Master/Slave network (hereafter called an O/I Link) using the MICRO/I and Touch units, and perform PLC Link
Communication with the PLC using the Master MICRO/I or Touch (hereafter called Master). The Slave MICRO/I and Touch units
(hereafter called Slaves) can read from and write to the PLC devices via the Master.
Up to one Master and 15 Slaves can be connected, and as is the case with PLC Link Communication, no special communication pro-
gram is required in the PLC.
With just a simple setting change, screen data being used with PLC Link Communication can be used as is with a MICRO/I or Touch
setup as a Master or Slave.
HG2G-S/-5S/-5F, HG3G/4G and Touch use different type of O/I link communication protocol than HG1F/2F/2S/3F/4F.
HG2G-S/-5S/-5F, HG3G/4G and Touch can not be connected with other HG1F/2F/2S/3F/4F in O/I link communication.
1.2 Operation
With O/I Link Communication a MICRO/I and Touch can read data from and write data to external devices.
• Reading from the PLC
The Master MICRO/I or Touch unit reads data directly from the PLC devices set in the currently displayed screen, and Slave MICRO/I or Touch
units read data from the PLC devices set in the currently displayed screen via the Master. Display parts (such as Numerical Displays and Pilot
Lamps) in the MICRO/I or Touch screens are updated with the latest data at all times.
• Writing to the PLC
When data input parts (such as bit and word button parts) in the MICRO/I or Touch screen are operated, they directly write to the PLC, and if they
are in a Slave screen they write to the PLC via the Master.
O/I Link Communication