Patent ID: 9566989
Date: 2017-02-14
CPC Classifications: B61L,G06F

Claim:
1. A control system for a railway safety critical application system, comprising: at least one controller executing first and second tasks; the first task having a first external communications interface capable of sending and receiving a safety critical systems message within a railway safety critical application system, the message including an input security code and input safety critical data; the second task having a second external communications interface capable of receiving a safety critical systems message, the second task having a security code generator; and an inter-task communications pathway coupling the first and second tasks; wherein the first and second tasks respectively receive via their respective first external communications interface and second external communications interface an input safety critical systems message including input safety critical systems data and an input security code, verify the input message integrity and generate output safety critical systems data, the second task generates an output security code and sends it to the first task via the inter-task communications pathway, and the first task sends an output safety critical systems message including the output safety critical systems data and the second task output security code for use within the railway safety critical application system.