Keyence's knowledge base and descriptions of all types of sensors and control devices (even PLCs).

Programmable Logic Controller (PLCS) - Servo Control - Motor Controller - Programmable Logic Controllers and Motion Controller - Machine Design offers engineers useful information regarding programmable logic controllers, motion controllers, plcs and motor controllers.

Maintenance world is an article source for maintenance management and equipment reliability professionals.

An online resource for industrial, process and factory automation; machine, motion and process control; and instrumentation professionals.

Online Italian technical resource for programmers of HMI, SCADA, MES, and PLC industrial applications.

Very informative site dealing with all forms of temperature measurement devices.