The 1756-L81EP module is a process controller module that is manufactured by Allen-Bradley/Rockwell Automation as part of the ControlLogix 5580 series. It has a special conformal coating that protects it from corrosive chemicals in harsh environments. The 1756-L81EP process controller module can also operate safely at extreme temperatures between -25 and 70 degrees Celsius or -13 to 158 degrees Fahrenheit. This process controller module is made to control application processes across a whole plant instead of in just 1 machine or system in the plant. The 1756-L81EP process controller module can operate with up to 32 tasks at a time and up to 1000 programs per task, and its maximum Ethernet communication speed is 1000 Mbps.