The number of basic frames can be configured in the channel via the machine data MD28081
$MC_MM_NUM_BASE_FRAMES. The standard configuration is designed for at least one
basic frame per channel. A maximum of eight basic frames are supported per channel. In
addition to the eight basic frames, there can also be eight NCU global basic frames in the
channel.
Channel-specific frames
$P_CHBFR[n]
System variable $P_CHBFR[n] can be used to read and write the basic frames. When a basic
frame is written, the chained total basic frame is not activated until the execution of a G500,
G54 ... G599 statement. The variable is used primarily for storing write operations to the basic
frame on HMI or PLC. These frame variables are saved by the data backup.
First basic frame in the channel
The basic frame with array index 0 is not activated simultaneously when writing to the
predefined $P_UBFR variable, but rather activation only takes place on execution of a G500,
G54 ... G599 statement. The variable can also be read and written in the program.
$P_UBFR
$P_UBFR is identical to $P_CHBFR[0]. One basic frame always exists in the channel by
default, so that the system variable is compatible with older versions. If there is no channel-
specific basic frame, an alarm is issued at read/write: "Frame: statement not permissible".
3.8.8.2 Frames active in the channel
Frames active in the channel are entered from the part program via the relevant system
variables of these frames. This also includes system frames. The current system frame can be
read and written in the part program via these system variables.
Frames currently active in the channel
Overview
Current system frames For:
$P_PARTFRAME TCARR and PAROT
$P_SETFRAME Preset actual value memory and scratch‐
ing
$P_EXTFRAME External work offset
$P_NCBFRAME[n] Current global basic frames
$P_CHBFRAME[n] Current channel basic frames
$P_BFRAME Current 1. Basic frame in the channel
$P_ACTBFRAME Complete basic frame
$P_CHBFRMASK and $P_NCBFRMASK Complete basic frame
$P_IFRAME Current settable frame
Current system frames For:
Work preparation
3.8 Coordinate transformations (frames)
NC programming
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0 649
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