Patent ID: 8306680

Claim:
An arrangement for controlling a railroad system which has sensors and actuators, the arrangement comprising: a programmable control unit for running a user program, a remote I/O unit to which a number of the sensors and actuators are connected, a communication network which connects the control unit and the remote I/O unit, and a remote disconnection unit coupled to the remote I/O unit as a separate entity, wherein the control unit is designed to process input data from the sensors using the user program in order to generate control commands for the actuators, wherein the control unit and the remote I/O unit are designed to interchange data messages via the communication network in order to transmit the input data and the control commands, wherein the control unit is further designed to integrate specific verification data for the disconnection unit into the data messages for the I/O unit, said verification data being independent from the input data and control commands, and wherein the disconnection unit is designed to deactivate the I/O unit depending on the specific verification data.