Abstract: A programmable logic controller capable of maintaining waterproofness or dustproofness includes a base unit with a substrate, a base case housing the substrate, and at least one holding part to hold a connection unit which is one of a plurality of module units. The connection unit includes a module-side connector, an engagement mechanism to be detachably engaged with the at least one holding part, and a module case with a fitting tenon to be engaged with the base case. The programmable logic controller includes an elastic member to apply a force in a first direction, which is a direction in which the connection unit moves away from the base unit, thereby pressing the engagement mechanism of the connection unit against the at least one holding part of the base unit, and a sealing member to seal a gap between the base case and the fitting tenon of the module case.

Abstract: A programmable logic controller capable of maintaining waterproofness or dustproofness includes a base unit with a substrate, a base case housing the substrate, and at least one holding part to hold a connection unit which is one of a plurality of module units. The connection unit includes a module-side connector, an engagement mechanism to be detachably engaged with the at least one holding part, and a module case with a fitting tenon to be engaged with the base case. The programmable logic controller includes an elastic member to apply a force in a first direction, which is a direction in which the connection unit moves away from the base unit, thereby pressing the engagement mechanism of the connection unit against the at least one holding part of the base unit, and a sealing member to seal a gap between the base case and the fitting tenon of the module case.

Abstract: A PLC unit comprises a control unit that includes a first surface of a substantially rectangular shape, where a unit-side connector is provided on a second surface that is a back surface side of the first surface, a base that includes a fixing surface having a base-side connector connected to the unit-side connector provided thereon, where a plurality of the control units are fixed on the fixing surface side by side in a lateral direction of the first surface, and a duct that is provided along a side part of the control unit on a longitudinal direction side of the first surface so as to be closer to the base side, wherein at least a part of the first surface of the control unit is constituted by a cover which is rotatably supported about an axis substantially parallel to the lateral direction of the first surface, and is openable in an area opposite to the base.

Abstract: A PLC unit comprises a control unit that includes a first surface of a substantially rectangular shape, where a unit-side connector is provided on a second surface that is a back surface side of the first surface, a base that includes a fixing surface having a base-side connector connected to the unit-side connector provided thereon, where a plurality of the control units are fixed on the fixing surface side by side in a lateral direction of the first surface, and a duct that is provided along a side part of the control unit on a longitudinal direction side of the first surface so as to be closer to the base side, wherein at least a part of the first surface of the control unit is constituted by a cover which is rotatably supported about an axis substantially parallel to the lateral direction of the first surface, and is openable in an area opposite to the base.

Abstract: A unit mounting device is a unit mounting device on which an electronic device unit 1 is mounted, and includes a base portion provided to face a side surface of the electronic device unit, an upper-side eaves portion formed to extend from an upper part of the base portion towards the electronic device unit side, a lower-side eaves portion formed to extend from a lower part of the base portion towards the electronic device unit side, a standing portion formed to project upward from an end part on an extending side of the lower-side eaves portion, and a projecting portion that is provided to have a width narrower than a width of the side surface of the electronic device unit and to project from the standing portion towards the electronic device unit side.

Abstract: An optical connection device according to the invention is an optical connection device for optically coupling light propagated through an optical waveguide to an optical element arranged outside the optical waveguide and with the following configuration. Part of the optical waveguide is removed so as to be shaped like a groove. The optical waveguide and the optical element are arranged so that an optical axis of the optical waveguide intersects an optical axis of the optical element at a specified angle inside the groove. An optical unit is arranged at a position of intersection of the optical axes for turning light by reflection from one optical axis along the other optical axis.

Abstract: An optical connection device according to the invention is an optical connection device for optically coupling light propagated through an optical waveguide to an optical element arranged outside the optical waveguide and with the following configuration. Part of the optical waveguide is removed so as to be shaped like a groove. The optical waveguide and the optical element are arranged so that an optical axis of the optical waveguide intersects an optical axis of the optical element at a specified angle inside the groove. An optical unit is arranged at a position of intersection of the optical axes for turning light by reflection from one optical axis along the other optical axis.