Powerful, small and exceptionally rugged, the Modicon™ M340™ Programmable Automation Controller (PAC) provides numerous cost and performance advantages over comparably priced midrange PLCs and is the natural choice as a companion to Schneider Electric's high-end controllers — Modicon Quantum and Modicon Premium PLCs; all of which are programmed with Unity™ Pro software. Unity Pro software provides the ability to quickly select, program and implement the controller to optimally manage simple to complex applications.

What you need to know

• Distributed Ethernet I/O for other Modicon PLCs. Learn more.
• Supports Modbus Ethernet TCP/IP and EtherNet/IP™ on the same module without requiring any configuration. The module consists of a four-port switch that also supports a daisy-chain loop on two ports. Use the links below to learn more.
  • Ethernet topologies for distributed I/O. >Illustration.
  • Ethernet I/O ring communications. >Illustration.
  • Ethernet daisy chain topologies. >Illustration.
  • Ethernet ring topologies with Modicon M340 PACs. >Illustration.
  • Ethernet complex, self-healing ring topologies. >Illustration.
• Flash memory backup requires no battery and helps to eliminate program loss and maintenance costs resulting from power failure. 
• High density 64 point I/O cards are only 1.25” wide. 
• Extended temperature (-25ºC to 70ºC) and conformal coating for operation in harsh environments 
• Rack expansion capability up to four 12-slot racks for applications with large I/O count requirements 
• Four MB memory enhances performance and application use (with up to 128MB data option with an SD Flash memory card) 
• Industry-standard network connectivity using CANopen®, AS-Interface®, Ethernet or Modbus™ reduces field wiring and lowers installation costs. Also supports connectivity to Modbus Plus 
• RTU model supports DNP 3.0 and IEC60870-5 serial or Modbus TCP/IP connections

Key documentation

• Modicon M340 PLC Brochure
• Modicon M340 PLC CAD Drawings
• Modicon M340 PLC Catalog