Specifications

Configuration Example for MELSEC System Q Ethernet
Quick Start Guide for the MELSEC STlite Series 4 - 17
In this example, 3 data registers from D1000 onward are reserved for input data from the MODBUS/
TCP node and 5 registers, starting with D2000, serve as output buffer holding data for the STL-ETH1.
4.3.2 Monitoring the Data Transfer
Set the host ID of the STL-ETH1 with the address selection switch (refer to section 4.2.4) according to
the automatic communication parameter settings.
After connecting the Ethernet interface of the QJ71MT91 with the head station’s fieldbus interface,
downloading the parameters to the PLC and powering ON the system, you can monitor the data
transfer in the Device Monitor of GX Works2.
Input data
Please note that the data from the digital input module is appended after the data from the analog
input module.
For the process images of the individual STlite modules please refer to the appendix, section A.1. For
example, reading a value of 16384 (4000
H ) from D1000 means that a voltage of 5.00 V is applied to
channel 1 of the STL-AD2-V.
Abb. 4-13: Auto refresh settings for the QJ71MT91
Abb. 4-14: Input data from the MODBUS/TCP node
Inputs from STL-DI8-V1
Input data from STL-AD2-V, channel 1
Input data from STL-AD2-V, channel 2