This TM221 controller is part of the Modicon M221 Logic controller range. It has 24 logic I/O and it is supplied with 24V DC. It is supplied with removable screw terminal blocks for connecting the I/O, a removable screw terminal block for connecting the power supply, a button cell backup battery BR2032 and a cable for connecting the analog inputs. M221 logic controllers have three types of integrated communication port, Ethernet, RS 232/RS 485 serial link and USB mini-B programming port. It enables the control of simple machines. The capacity of M221 logic controllers can be enhanced with the Modicon TM3 expansion module offer.