Abstract: There is described a peripheral module which in addition to the connection terminals for the process data supply has connection terminals for the supply of voltage. Furthermore, the peripheral module has a changeover switching device to disconnect the peripheral module from an upstream load group. The peripheral module can assume the function of a supply group or a power module when a supply voltage is applied to the terminals. In a peripheral system made of several peripheral modules the voltage within a load group is supplied via an internal self-constructing voltage bus.

Abstract: There is described an electrical system including a device which features a load current circuit and connection terminals for connection of the load current circuit. In the supply line to the connection terminals, separation contacts are present for separating the load current circuit during operation of the device. Means for explosion protection are provided in connection with the separation contacts.

Abstract: A modular control system, which is constructed from terminal modules and function modules to fit these, for use in industrial automation in particular is provided. With the known embodiments, which comprise different terminal modules for different functionalities, subsequent system extensions can often only be achieved with significant outlay. With the inventive modular control system this problem is resolved by the use of novel terminal modules of identical structure, with the different functionalities being provided by additional function units. Additional advantages, in addition to simpler modification of the system configuration, are lower planning and assembly outlays, simpler and error-free pre-assembly of the standard terminal modules, simpler stocking of spare parts, clear transparency in respect of the supply of supply voltages, potential forwarding and separation and specialist functions such as simple and transparent handling during gradual commissioning.

Abstract: Retention of replaceable subassemblies, with automatic forced disconnection. The invention relates to a terminal module 1 for locking a subassembly or a PS module 2 on the terminal module in a way that satisfies safety requirements. The subassembly 2 is hinged onto the terminal module 1. The terminal module 1 has a sliding catch 3 for fixing the subassembly 2 on the terminal module 1. Disconnection of electrical contacts is guaranteed during the hinging-on.