ABB AC 800F Engineering Manual

Also see for AC 800F: Mounting and installation instructions

Contents

ABB AC 800F Engineering Manual Manual pdf 46 page image

Process Station ABB FieldController 800447.2 SynchronizationThe active FieldController (Primary) automatically ensures that the passive FieldController (Sec-ondary) can take over in the event of redundancy. The adjustment of operating system, user pro-grams and redundancy data necessary for this is performed via a redundancy connection, the re-dundancy link. The connection is produced at the front of FieldController and is implemented viaan Ethernet cable, optionally 10BASE2 (BNC), AUI, or twisted pair cable (TP) .When the FieldController is bootstrapped one of the two FieldControllers automatically becomesthe Primary. The second FieldController recognizes a Primary on the station bus and reports tothe Primary as Secondary.A newly plugged-in FieldController recognizes automatically that another FieldController isalready active on the station bus and moves automatically into the passive status.In the adjustment between the active FieldController and a passive FieldController, a connectionis established via the redundancy link. The user program is transmitted from the Primary to theCPU.The Secondary performs a cold start with these data and then logs on at the Primary. The currentprocess data are then transmitted to the Secondary. After successful transmission, both Field-Controllers move to “sync“ status. From now on, the Secondary is ready for a bumpless redun-dancy toggle. The relevant process data are adjusted cyclically.The synchronization runs in parallel with the processing of the applications programs in the Field-Controller.Depending on the Boot priority of the Secondary, side-effects can be avoided when synchronizingtasks. The higher the Boot priority of the Secondary compared to the processing priority of thetask (51 – 99), the faster the FieldController reaches Sync status.See also Engineering Manual, System Configuration, Project Tree, Process Station.Gross Automation, 1725 South Johnson Road, New Berlin, WI 53146, www.ssacsales.com, 800-349-5827