NE870 is an industrial router which also acts as a firewal. The

router/firewa l can be utilized to segment a system in to network

areas and also security zones. NE870 is primarily intended to be

used to separate client/server networks and control networks, to

separate different control and safety networks, but also to create

RNRP tunnel areas between RNRP networks.

The concept of security zoning is described in IEC62443. In short,

security zoning is a method to segment a system into zones with

different security levels. A security level is complied with by

implementing a combination of security counter measures. The

reason why it potentialy could make sense to divide a system into

security zones, which comply with different security levels, could be

that the risk for different parts of the system varies. Another could be

that the impact of a potential incident varies.

NE870 supports RNRP (Redundant Network Routing Protocol), which

enables 800xA to have two physicaly separate networks, and thereby

avoid single point of failure.