WindO/I-NV4 User’s Manual 3-3
2 O/I Link Communication
3
Communication
2.1 Overview
O/I Link Communication is a protocol for communication between Master and Slave, where a MICRO/I connected to
the external device is configured as a Master and multiple MICRO/I (Slaves) communicate with the external device via
the Master.
The Master MICRO/I unit communicates with the external device by means of Device Link Communication. The
Master MICRO/I is called an O/I Link Master and a slave MICRO/I connected to the O/I Link Master is called an O/I
Link Slave. A maximum of 15 O/I Link Slaves can be connected to an O/I Link Master.
2.2 O/I Link Communication Settings
These settings are configured under the O/I Link tab on the Project Settings dialog box. The Project Settings dialog
box can also be accessed using the following methods.
• Click Project on the Configuration tab.
• Double click Project Settings in the Project window.
The O/I Link Communication Settings can only be configured when O/I Link Master or O/I Link Slave is selected
in Function under Interface Settings on the Communication Interface tab. For details, refer to Chapter 4 “3.5
O/I Link Tab” on page 4-55.
2 O/I Link Communication
HG3G
HG2G-5FHG5G-V HG4G-V HG3G-V HG2G-V HG2G-5T
HG4G HG1G HG1P
HG2J-7U
Read Write
5678
MICRO/I
O/I Link Slave
(Slave 1)
MICRO/I
O/I Link Slave
(Slave 2)
MICRO/I
O/I Link Slave
(Slave 15)
MICRO/I
O/I Link Master
External device
0
1
Read
Write
D1:
M1:
5678
O/I Link Communication
Device Link Communication
Numerical Display
Reference Device Address: D1
Bit Button
Destination Device Address: M1
Read Write Read Write
O/I Link Communication can only be used for the External Device Communication 1. The
communication driver of O/I Link Slave should match the O/I Link Master's.
For details regarding the O/I Link Communication, refer to Chapter 3 "O/I Link Communication" in the
WindO/I-NV4 External Device Setup Manual.
• Use the runtime system version 4.01 or later for HG4G/3G and HG2G-5F/-5S/-S when connecting the
HG2J-7U, HG5G/4G/3G/2G-V, HG4G/3G, HG2G-5F/-5S/-S, HG1G/1P via O/I Link Communication.
• The HG2J-7U, HG5G/4G/3G/2G-V, HG4G/3G, HG2G-5F/-5T, HG1G/1P and the HG4F/3F/2F/2S/1F use a
different protocol for the O/I Link Communication. To communicate them via the O/I Link
Communication, select the Use the same O/I Link Communication as the HG4F/3F/2F/2S/1F
check box on the Compatible tab of the Project Settings dialog box.
• O/I Link Communication is only supported by models with a serial interface (RS422/485).
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