Glossary · Automation fundamentals, platforms and components
LOGO! (Siemens logic module)
Also known as: Siemens LOGO!, LOGO! logic module
German: LOGO!
In industrial automation, LOGO! is a compact logic module product line from Siemens for small control tasks, programmed with graphical function blocks or ladder logic in the vendor's software or, for simple programs, directly on the device.
- Automation components
- Vendor product
In one sentence
LOGO! is a Siemens logic module line for small control tasks such as lighting, doors or small machines, programmed graphically.
Example
A LOGO! module controls the ventilation and lighting of a greenhouse based on time switches and a temperature input.
How it applies
- Engineering: Logic modules suit small tasks with limited I/O, such as lighting, gates, pumps or simple machines, where a full PLC would be oversized.
- Maintenance: Programs should be backed up and version-controlled like any control software, even on small devices.
- Documentation: Provide the program printout or file, the I/O assignment and the parameter values with the machine documentation. If the logic module handles safety-relevant functions, check that the device is rated for them; standard logic modules are not safety controllers.
Logic module vs. PLC
Logic modules are simpler and cheaper than PLCs, with fewer I/O and programming features. Other vendors offer similar product lines.
Keep in mind: Product names, versions and features of LOGO! change over time. Check the current Siemens documentation before relying on specific capabilities.