Справочник Пользователя для Mitsubishi Electronics FX3G

FX

3S

/FX

3G

/FX

3GC

/FX

3U

/FX

3UC

 Series

Programming Manual - Basic & Applied Instruction Edition

4 Devices in Detail

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

3U

 Series PLC.

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.

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.

X000

X000

Y000

X001

Program example

Y000

X000

X000

PLC

Y000

Y000

NO contact

NC contact

External power

supply

Y000

COM1

Load

Output terminal

X000

0V

Input

signal

Input

terminal

24V

S/S