The Siemens LOGO! 6, 7 and 8 expansion modules extend the LOGO! range of programmable logic controllers (PLC) with additional digital and analogue inputs including 0 to 10V, 0/4 to 20mA current loop and PT100/PT1000 temperature sensors. Additional outputs include analogue 0 to 10V, 0/4 to 20mA current loop, and PT100/PT1000 temperature sensors. Digital outputs are expandable with up to 8 x relays per module.