A safety controller module for providing safety control comprises a non-volatile memory configured for storing a safety control program and one or more processing units configured to execute safety control functions associated with the safety control program to provide independent safety control. The safety controller module further comprises a connector configured to communicatively couple the safety controller module with a non safety controller. The safety controller module is configured to communicate an input and/or an output signal of the safety controller module via the connector to the non-safety controller.

A terminal assembly module is provided that simplifies the transfer of I/O wiring from a pre-existing industrial controller to a replacement industrial controller. The terminal assembly module replaces an I/O module in the pre-existing industrial controller chassis. The I/O module terminal block, with I/O wiring maintained intact, is removed from the discarded I/O module and installed on the terminal assembly module. A multi-conductor cable is then plugged into a cable connector on the front of the terminal assembly module, which electrically connects the I/O module terminals to the conductors of the cable. The cable conductors can then be connected to the I/O modules of the new industrial controller. Thus, the terminal assembly module eliminates the need to disconnect the existing I/O wiring from the I/O module terminal blocks of the pre-existing industrial controller.

A fail-safe central processing unit for a programmable logic controller (PLC) includes one or more sub-slot(s) configured to receive a signal board with multiple input/output (I/O) channels, wherein the signal board is configured as a fail-safe signal board and allows expansion of multiple fail-safe VO channels to the fail-safe central processing unit.

An electronic apparatus for inputting and outputting signals is provided with a plurality of processing circuits for inputting and outputting signals, a plurality of common power terminals connected to different processing circuits to supply power to each of the plurality of processing circuits, a plurality of individual power terminals connected to different processing circuits to supply power to each of the plurality of processing circuits, and a conductive member which is detachably provided and electrically connects the plurality of common power terminals.