IDEC High Performance Series - Manual (Page 20)

Chapter 1
2
External Device Setup Manual
1 PLC Link Communication
1.1 Overview
With the PLC Link communication, the MICRO/I and Touch reads from and writes data to external devices such as relays and regis-
ters via the PLC's Link Unit or the CPU Unit Programming Port (the terminology used depends on the PLC manufacturer). No special
communication program is required on the PLC when PLC Link communication is used.
1.2 Operation
The MICRO/I and Touch can use PLC Link communication to read from and write to external devices.
• Reading from the PLC
The continuously reads data from external devices set in the currently displayed screen, and display parts (such as Numerical Displays and Pilot
Lamps) in the MICRO/I or Touch screen are updated with the latest data at all Times.
• Writing to the PLC
When data input parts in the MICRO/I or Touch screen (such as Bit or Word buttons) are operated, reading from the PLC is interrupted, and data is
written to the PLC.
1.3 1: N Communication
When the Host I/F driver or Communication driver supporting the 1: N Communication is selected, two or more external devices can
be connected to a single MICRO/I or Touch. Refer to Chapter 6 "1: N Communication (Multi-drop)" on page 627 for the details.
Reading from and writing to PLC devices
MICRO/I or Touch