Abstract: Device for validating digital messages, applicable, in particular, to rail traffic regulating systems, of the type in wihch the absolute identity and the dynamic state of two digital messages (A and B) originating from two processing channels in parallel are checked, before producing, by means of an output amplifier (6), an on/off analogue safety signal (S) ensuring the operation of an actuator, characterised in that it further includes a Wheatstone diode bridge (1), the alternate inputs (2 and 3) of which are supplied respectively by the two messages (A, B), previously inverted in relation to one another, and the continous diagonal of which comprises an oscillator (4) the output (s) cf which constitutes the identity check signal for the messages (A, B), this signal controlling the output amplifier (6) via a static relay (5).

Abstract: A self-opening and self-closing device enabling entry into a controlled access area includes a gate with two laterally retractable panels that may be opened by inserting a ticket or access card into a control mechanism. Each of the panels is controlled by a respective motor operated by the control mechanism. Each panel is secured to at least two runner members that are each operated by a roller secured to a link arm. The link arms are rotationally interconnected and rotated by the respective motor. Simultaneous rotation of the arms in opposite directions moves the two panels together (or apart) and thus closes (or opens) the entry device by moving each panel into a position in which it is locked by the respective arm in the horizontal position.

Abstract: Microprocessor based safety system applicable, in particular, to the field of rail transport, for monitoring and controlling actuators (ACT) as a function of the data supplied by sensors (CP), characterized in that it includes at least two microprocessors (P1, P2) in parallel handling the same application, the inputs of which receive the pre-encoded data (DE) from the sensors (CP), and the output data of which is read back in safety for comparison with the input data, and a third, comparison microprocessor (P3) known as a voter, for comparing, using software and in safety, the encoded characteristic results (R1, R2) of the two application microprocessors (P1, P2) and operating in consequence a dynamic controller (CD) authorizing the transmission of the output data (DS) to the actuators (ACT).