Programmable Logic Controllers and Expansion Modules

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PLCs and expansion modules for industrial automation

A programmable logic controller (PLC) receives sensor signals, executes a control program and sends commands to drives, valves and other actuators. Expansion modules add the inputs, outputs or communication interfaces a system requires. This category covers components for individual machines and systems with multiple control nodes.

What is in this category

WECON PLCs and modules — controllers in different formats, local expansion modules and remote I/O options.
FESTO PLCs and modules — machine control components, including CODESYS-based controllers and expansion options.
PLC accessories — components for connecting and mounting the control system.

How to select a PLC and expansion modules

Signal list: count digital inputs and outputs, analog channels, temperature sensors and special signals. Allow for planned expansion.
Output types: check whether relay or transistor outputs are required and match NPN/PNP wiring to the actual devices.
Communication: identify the interfaces needed for HMI panels, drives and remote modules. Check Modbus, PROFINET, EtherCAT and other protocol support by part number.
Performance: consider program cycle time, data volume and motion control requirements where applicable.
Expansion compatibility: confirm that each module matches the PLC series, expansion bus, power requirements and programming environment.

Related sections

For a complete system, explore network and I/O modules, HMI operator panels, sensors and drives. For help with a specification, visit contacts.

PLC and expansion module FAQ

What information is needed to select a PLC?

Provide the signal types and counts, machine sequence, power supply, required protocols, HMI and drive models, and plans for future expansion.

Can I connect 0–10 V or 4–20 mA sensors?

Yes, if the PLC has suitable analog inputs or a compatible expansion module. Match each channel’s signal type and range to the sensor.

What is the difference between local and remote I/O?

A local module connects through the PLC’s expansion system. A remote module can be installed closer to the equipment and communicates over a supported industrial network.

Can I attach an expansion module from another manufacturer directly to a PLC?

Local module compatibility depends on the PLC series and expansion bus. Devices from different manufacturers may exchange data over a shared protocol if both support it.