Phoenix Contact 2701559 The Axioline F is a digital input module that supports functional safety and is specifically designed for use with Phoenix Contact Contact or Siemens controllers. It offers various configurations to accommodate different assignment needs, including 4-channel or 8-channel digital inputs. The module operates on a 24V DC power supply and features connection technologies of 2-, 3-, or 4-conductor types, providing an IP20 degree of protection against solid particles and dust.