Siemens SINUMERIK 840D sl Programming Manual page 649

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Backup battery

A backup battery ensures that the → user program is stored retentively in the → CPU along

with specified data areas and bit memory, timers, and counters.

Back-up memory

The backup memory enables buffering of memory areas of the -> CPU without a buffer

battery. Buffering can be performed for a configurable number of times, counters, markers

and data bytes.

Axis whose setpoint or actual value position forms the basis of the calculation of a

compensation value.

Basic Coordinate System

Cartesian coordinate system which is mapped by transformation onto the machine

coordinate system.

In the -> parts program, the programmer uses the axis names of the basic coordinate

system. The basic coordinate system exists in parallel to the -> machine coordinate system

when no -> transformation is active. The difference between the systems relates to the axis

identifiers.

Rate of data transfer (Bit/s).

"Block" is the term given to any files required for creating and processing programs.

Block search

For debugging purposes or following a program abort, the "Block search" function can be

used to select any location in the part program at which the program is to be started or

Loading the system program after power on.

Bus connector

A bus connector is an S7-300 accessory part which is supplied together with the -> I/O

modules. The bus connector expands the -> S7-300 bus from the -> CPU or an I/O module

to the neighboring I/O module.

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Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0