Schneider Electric 840 USE 106 0 manual Default Transfer Area, Automatic

Theory of 984 HSBY Operation

Default Transfer Area

Automatic	By default, the Hot Standby system automatically transfers the following from the
Transfer	Primary to the Standby controller on every scan:

The first 8192 points of 0x output reference data

lThe first 8192 points of 1x input reference data

A total of 10K registers, of which 1K is allotted for 3x registers and 9K is allotted for 4x registers.

In any case, the number of 4x registers transferred is a multiple of 16 unless all 4x registers have been included. The number of 4x registers may slightly exceed the allotment in order to reach the next highest multiple of 16.

Any state RAM values above the limits shown in the following diagram are not included in the state RAM transfer area and therefore are not shared with the Standby controller. The state RAM values in the range above these limits must not contain the command register or control critical I/O.

38 840 USE 106 00 January 2003