IDEC High Performance Series - Manual (Page 180)

6 Sub Host Communication
3-78 WindO/I-NV2 User’s Manual
6.1 Overview
Like PLC link communication, Sub Host Communication is a communication method for reading and writing data from
and to devices such as relays (e.g., PLCs) and registers. The basic functions of Sub Host Communication are the same
as with PLC link communication. Sub Host Communication performs communication via programming ports on PLC
link units (the unit name depends on PLC model) and CPU units or other serial ports. Using Sub Host Communication
with PLC Link Communication makes it possible to communicate with two PLCs without making a communication
program in the PLC.
6.2 Operation
The MICRO/I can use the sub-host communication method to read and write host device data. To read and write host
device data, assign host device addresses to the HG link register (LLR), which is a HG internal decide. The MICRO/I
can read and write data from and to the assigned host device via the LLR.
6 Sub Host Communication
HG3G HG2G-5F HG2G-5S HG2G-S HG4G HG1F HG2F HG2S HG3F HG4F
• Sub Host Communication cannot be used with the HG2G-5S USB interface (Serial 2 in Interface
Configuration under Communication Interface tab on the Project Settings dialog box).
• The HG1F cannot simultaneously use Serial Interface 2 and the O/I Link Interface. The interface to use
is set in the Project Settings dialog box on the Communication Interface tab.
• The HG1F cannot use the O/I Link Interface when in the following states.
- The maintenance cable is connected to Serial Interface 2.
- In the Project Settings dialog box, on the Host I/F Driver tab, the Enable Pass-Through check box
is selected.