PLCs and smart relays provide programmable control for machines and processes. This section also includes expansion modules, programming cables and communication converters. Use the category icons below to find equipment for tasks ranging from simple timing and logic to applications with more extensive input and output requirements.

> Inovance PLCs and modules: Browse the relevant family for CPUs, digital/analog expansion and communication options. USB, RS-485 and module support must be checked for the specific model.

> INVT PLCs and modules: Select the CPU and additional modules according to the required I/O configuration and communication needs. Check compatibility between the programming software and hardware version.

> HCFA PLCs and modules: Compare the supply voltage, I/O configuration and module compatibility of families such as LX1N and LX1S. Confirm technical support terms before ordering.

> Board-type PLCs: These controllers are intended for integration into machinery. This group is aimed at volume supply enquiries; enclosure, power supply and wiring requirements must be assessed for the project.

> Shihlin PLCs: Use the complete model number when choosing replacements or spare parts for an existing system. Telephone technical support is not provided for Shihlin PLC/HMI products; repair service terms are assessed separately.

> DERELL PLCs and smart relays: Browse options for basic control applications, including the C series. When replacing an older series, check program, wiring and hardware compatibility.

> PLC programming and communication cables: Match the device model, port, pinout and software support for the intended computer, PLC or HMI connection. A matching connector shape alone does not establish compatibility.

> USB and protocol converters: USB-to-RS-232/RS-485 interface converters and protocol gateways serve different purposes. Converting the electrical interface alone does not translate the communication protocol.

When selecting a controller, assess the supply voltage, digital/analog I/O count, relay or transistor output type and expansion compatibility together. For high-speed counting or pulse outputs, check the specific model's limits. For HMI and drive connections, verify both the port and the communication protocol.