Frames Active In The Channel - Siemens SINUMERIK 840D sl Programming Manual

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
$P_PARTFRAME
$P_SETFRAME
$P_EXTFRAME
$P_NCBFRAME[n]
$P_CHBFRAME[n]
$P_BFRAME
$P_ACTBFRAME
$P_CHBFRMASK and $P_NCBFRMASK
$P_IFRAME
Current system frames
NC programming
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
3.8 Coordinate transformations (frames)
For:
TCARR and PAROT
Preset actual value memory and scratch‐
ing
External work offset
Current global basic frames
Current channel basic frames
Current 1. Basic frame in the channel
Complete basic frame
Complete basic frame
Current settable frame
For:
Work preparation
649