IDEC High Performance Series - Manual (Page 106)

3 DM Link Communication
3-4 WindO/I-NV2 User’s Manual
3.1 Overview
DM Link Communication reads and writes value to external devices using the MICRO/I's dedicated DM Link memory.
The device type of dedicated DM Link memory is DM.
This method uses a dedicated IDEC protocol, so a communication program is required in the external device.
●
Communication Methods
There are two basic types of DM Link Communication. 1:1 Communication, where the MICRO/I is connected to an
external device; and 1:N Communication, where multiple MICRO/I are connected to an external device.
■ 1:1 Communication
The external device is connected to a single MICRO/I.
The Event Transmission function from the MICRO/I can be used with 1:1 communication.
The Event Transmission function is a function that works as follows. When value in the dedicated DM Link memory of
the MICRO/I is changed, the data is transmitted from the MICRO/I to the external device.
3 DM Link Communication
HG3G HG2G-5F HG2G-5S HG2G-S HG4G HG1F HG2F HG2S HG3F HG4F
MICRO/I
999
5678
External device
DM Link Communication
Read
Write
DM0: 999
DM1: 1234 5678
DM0
DM1
DM2
DM8190
DM8191
Dedicated DM Link memory
Numerical Display
Destination Device: DM0
Numerical Display
Reference Device: DM1
For details regarding the DM Link Communication, refer to Chapter 4 "DM Link Communication" in the
"External Device Setup Manual".
MICRO/I
Dedicated DM
Link memory
External device DM Link 1:1 Communication
Read
Write
MICRO/I
Event transmission
Dedicated DM
Link memory
External device
DM0: 0
DM1: 0
DM2: 0
100
150
200
DM0: 100
DM1: 150
DM2: 200
DM Link 1:1 Communication