Functions And Roles - Mitsubishi Electric FX3G SERIES Programming Manual

Programmable controllers

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Table of Contents

Series Programmable Controllers

Programming Manual - Basic & Applied Instruction Edition

Functions and roles

Examples of terminal names and wiring (sink input) are for the FX

The PLC receives signals from external switches

through input terminals.

An input relay (X) connected to an input terminal

inside the PLC is an electronic relay isolated

optically, and has many NO contacts and NC

contacts. These contacts can be arbitrarily used

inside the PLC.

These input relays cannot be driven by the program.

Program example

The PLC outputs signals to external loads through

output terminals. Contacts for external output

(output devices such as relay contacts, TRIACs and

transistors) of output relays are connected to output

terminals inside the PLC. An output relay has many

electronic NO contacts and NC contacts. These

contacts can be arbitrarily used inside the PLC.

Differences in operations between external output

contacts (output devices) and internal contacts are

explained on the next page.

4 Devices in Detail

4.2 I/O Relays [X, Y]

External power

Output terminal

Fx3u series Fx3uc series