ABB Ability 800xA Series User Manual

Also see for Ability 800xA Series: Operation User manual User manual Operation Operation

Contents

ABB Ability 800xA Series User Manual Manual pdf 21 page image

1.1.4 RedundancyThe Linking Device supports device redundancy. In the redundant mode, a set of twophysical Linking Devices forms one logical Linking Device. One operates as primarydevice, the other as secondary device or backup device. Both devices of a redundantset are connected to the same HSE subnet and to the same H1 links. If the primarydevice fails, the secondary device automatically takes over the role of the primary deviceto ensure continuous system operation. The failed physical Linking Device can be replacedand the new device will further on act as secondary device. The system is then againable to tolerate a failure in one of the two physical Linking Devices.A more detailed description of the redundancy concept is given in Redundancy onpage 105.1.2 Integration into the Industrial IT System StructureWithin an 800xA System structure as shown in Figure 1.2, a FOUNDATION™ Fieldbussubsystem is linked to the control system via the HSE subnet. The Linking Devices serveas gateways between the field devices on the H1 links and the HSE subnet. TheFOUNDATION™ Fieldbus subsystem consists of Linking Devices and possibly otherdevices that communicate with one another using the HSE protocol and subsidiary H1links. As a device registered as a class 42c device of the HSE profile, the LD 810HSE Exallows process data that are being published cyclically on the subsidiary H1 links to berepublished on the HSE subnet. By using HSE republishing, it is possible to configurecyclical communication between field devices on different H1 links and devices on theHSE subnet. Furthermore, alarms and events from H1 devices are communicated to theConnectivity Servers FF, thus allowing seamless integration in the overall 800xA alarmmanagement philosophy.The displayed system structure also includes redundant LD 810HSE Ex. Thecorresponding H1 ports of both physical Linking Devices making up a redundant set ofLinking Devices are connected to the same H1 link. Both physical devices belonging toa redundant set are connected via a redundant link wiring for exchanging redundancycontrol information.2PAA114135-610 211 Introduction1.2 Integration into the Industrial IT System Structure