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.

Provided in the present disclosure is a guiderail fixing structure. The guiderail fixing structure comprises: a housing; a transverse fixing component, arranged at the bottom part of the housing, being two mounting stands provided opposite each other, and used for implementing transverse fixing between a guiderail and the housing; and a vertical fixing component, arranged at the bottom part of the housing and within the two mounting stands provided opposite each other, and used for implementing vertical fixing between the guiderail and the housing. The vertical fixing component comprises engaging hooks and an engaging hook part. When the vertical fixing component is employed, the engaging hooks of the vertical fixing component used for engaging are arranged outside of either edge of the guiderail, and the engaging hook part of the vertical fixing component is arranged within the guiderail.

A rail mounting backplane kit is provided and including a backplane assembly, a first mating structure and a second cooperating structure. The first mating structure is for cooperating with a first cooperating structure of a first cooperating backplane kit for allowing or restraining assembly of the backplane assembly and a first cooperating backplane assembly of the first cooperating backplane kit, and the first mating structure includes a plurality of first mating features, which can selectively be protruding, flat or recessed mating features. The second cooperating structure is for cooperating with a second mating structure of a second cooperating backplane kit for allowing or restraining assembly of the backplane assembly and a second cooperating backplane assembly of the second cooperating backplane kit, and the second cooperating structure includes a plurality of second cooperating features, which can selectively be protruding, flat, or recessed cooperating features.

An electronic device is provided and includes a backplane assembly, a detachable assembly and a locking assembly. The detachable assembly is detachably assembled with the backplane assembly. A slot is formed on the detachable assembly. The locking assembly is disposed between the backplane assembly and the detachable assembly for locking the detachable assembly on the backplane assembly. The locking assembly includes a latch component pivotally disposed on the backplane assembly. An end of the latch component is configured to stretch into the detachable assembly through the slot. The end of the latch component engages with the slot for restraining the detachable assembly from being detached from the backplane assembly when the latch component is located at a locking position. Besides, a related backplane assembly kit and a related detachable assembly kit are also provided.

A controller unit includes: a base unit having a slot; a module that includes a printed circuit board and that is mounted on the base unit; a pair of male and female connectors, one being included in the base unit and the other being included in the module; and a turning support that allows the module to be turned with respect to the base unit. A pair of a recess and a projection are provided to prevent wrong attachment. The base unit has one of the recess and the projection and the module has the other. The positions of the recess and the projection vary depending on the type of module.

A method for securing and removing modular elements employing latches is disclosed. A modular element may include a chassis body supporting electronic components. The body is in communication with a latch and a control member of the modular element. The modular element is removable from or secured to an enclosure using the latch. The latch may engage the enclosure and may remain engaged by being secured by interfacing with a catch of an arm of the control member. By connecting the arm to the control body with a living hinge, the living hinge may urge the catch into a detent of the latch to secure the latch and keep the modular element secured to the enclosure. The latch may be disengaged from the control member by applying a disengagement force to remove the catch from the detent. In this manner, the modular element is efficiently secured and removed from the enclosure.

An electric device system includes a first unit and a second unit adjacent to each other. An elastically deformable first connecting terminal is provided in the first unit, and a second connecting terminal is provided in the second unit. When the first unit is assembled in the second unit, the first connecting terminal comes into contact with the second connecting terminal after sliding on an outer surface of a casing of the second unit. A bulging surface is provided in an exposed surface of the first connecting terminal, and a recess is provided in an exposed surface of the second connecting terminal. A part of the bulging surface and a part of an opening edge of the recess come into press-contact with each other by fitting a part of the bulging surface in the recess, thereby establishing electric conduction between the first connecting terminal and the second connecting terminal.

Modular elements employing latches with flexure bearings are disclosed. A modular element may include a chassis body supporting electronic components. The body is in communication with a latch and a control member of the modular element. The modular element is removable from or secured to an enclosure using the latch. The latch may engage the enclosure and may remain engaged by being secured by interfacing with a catch of an arm of the control member. By connecting the arm to the control body with a flexure bearing, the flexure bearing may urge the catch into a detent of the latch to secure the latch and keep the modular element secured to the enclosure. The latch may be disengaged from the control member by removing the catch from the detent. In this manner, the modular element is efficiently secured and removed from the enclosure.

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.

There is described a control peripheral post of railway field devices, comprising: at least one row of control modules operatively connected or connectable by electric cables to field devices; a support frame having a front side and housing said row of control modules; wherein said support frame comprises at least one anti-extraction bar positioned on the front side of the support frame, said bar being adapted to selectively take an extraction configuration, wherein said bar is positioned in such a way as to permit the extraction of the control modules from the front side of the support frame, and a blocking configuration, wherein said bar is positioned in front of said row of control modules so as to prevent the extraction of the control modules (4, 5) of said row from the front side of the support frame.