Modicon M340PLC

IEC 61131-3 languages, data types, DDT/DFB, tasks and project structure in Control Expert for M340/M580.

Official title

EcoStruxure Control Expert - Program Languages and Structure, Reference Manual

se.com document page 35006144K01000, version 27 (the page always serves the current version).

Link verified 2026-10-02

Meaning of %S system bits and %SW system words of Modicon PLCs — used for diagnostics, cycle time and error handling.

Official title

EcoStruxure Control Expert - System Bits and Words, Reference Manual

se.com document page EIO0000002135, version 12 (the page always serves the current version).

Link verified 2026-10-02

Hardware installation of M340 controllers: racks, processors, power supplies, memory cards, LEDs and diagnostics.

Official title

Modicon M340 Controllers, Setup Guide

se.com document page 35012676K01000, version 16 (the page always serves the current version).

Link verified 2026-10-02

Ethernet services of BMX NOE/P34 20x0: Modbus TCP messaging, I/O scanning, global data, FDR, SNMP and web diagnostics.

Official title

Modicon M340 Ethernet Communications Modules and Controllers, User Guide

se.com document page 31007131K01000, version 19 (the page always serves the current version).

Link verified 2026-10-02

Hardening of Modicon M580/M340 systems: access control, services, certificates, IPsec, event logging and security recommendations.

Official title

Modicon Platform Cybersecurity, User Guide

se.com document page EIO0000001999, version 15 (the page always serves the current version).

Link verified 2026-10-02