Patent ID: 9344296
Filing Date: 2016-05-17
CPC Classification: H04L

Claim Text:
1. An access protection accessory for an automation network which is connected to an automation installation configured to perform an automation process executable in at least two states, the access protection accessory comprising: a digital storage medium configured to store at least first rules and second rules; a combinational logic module configured to perform scaling operations or linearization operations in which at least one measurement parameter is compared with at least one associated threshold value, and a state change is detected when the at least one measurement parameter is above or below the at least one associated threshold value; network ports; and a processor configured to read the at least first and second rules, process the at least first rules and second rules and receive and forward data from the access protection accessory through the network ports; wherein the first rules, in a first state of the automation process, define which received data are forwarded from the access protection accessory and which received data are not forwarded from the access protection accessory; wherein the processor is further configured to receive at least one signal at the combinational logic module indicating a change in a state of the automation process and detect the change in the state of the automation process by evaluating the signal; and wherein, following reception of the at least one signal, the second rules define which received data are forwarded from the access protection accessory and which received data are not forwarded from the access protection accessory.