Allen-Bradley 1771-OW

Allen-Bradley relay contact output modules offer either normally-open (Form A) or normally-closed (Form B) configurations. You can select the form configuration for four of the contact output modules, the 1771-OW, -OW16, -OWN, and -OX. The 1771-OW has eight selectable outputs. The 1771-OW16 has eight normally-open and eight selectable outputs. The 1771-OWN has 32 selectable outputs.The 1771-OX has four selectable outputs. Selectable-configuration means you can predetermine whether an output will be on or off when local power is lost to the control system or the output module. The 1771-OWNA has 32 non-selectable normally-open contacts.

Hard contact outputs contain mechanically operated contacts. Examples of hard contact outputs include relays, push buttons, limit switches, and contact output modules such as Allen-Bradley's PLC module (Catalog No. 1771-OW) or SLC module (Catalog No. 1746-OW16). Any contact that does not have a leakage current while in the OFF state can be considered a hard contact device.