06.03
16.2 Expanded message frame configuration (SW 2.2 and higher)
16-503
 Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
For the physical unit as well as the drive-end weighting of the drive actual
values transferred in the additional PDA, please refer to the data description
of the specific drive documentation.
S Drive actual values composed of 2 PDAs (both 16-bit) e.g.
– Encoder 2 position actual value 1 (G2_XACT1)
– Encoder 2 position actual value 2 (G2_XACT2)
are mapped on two separate data items (both 32-bit) in the system variable
$VA_DP_ACT_TEL.
Fig. 16-2 shows how the process data of the message frame are mapped onto system variable
$VA_DP_ACT_TEL:
Process data: Standard
frame
PDA1 . . . . . PDAx PDAy. . . . .
Process data: addi-
tional drive data
PDA for expanded message frame
System variable $VA_DP_ACT_TEL[n, a]
PDA1 . . . . . PDAx+1PDAx PDAy. . . . .
0
31
15 015015 015
0
Index n = 0 Index n = x Index n = yIndex n = x+1
1516 31 0
1516
31 0
1516
31 0
15
16
Bit 31...16 = bit 15 Bit 31...16 = bit 15
Bit 31...16 = bit 15
Bit 31...16 = bit 15
PDAx1
Fig. 16-2 Mapping principle: PDA on system variable $VA_DP_ACT_TEL
Notice
The responsibility for possibly necessary format conversions or correct inter-
pretation of the physical unit and significance of a system variable used in parts
programs or synchronized actions lies exclusively with the user. Due to system
restrictions, it is not possible for the NC to perform a consistency check.
16.2.2 Requirements
The following conditions must be met to configure an expanded message frame:
S Drive
The drive to be used for the expanded message frame configuration must
support customizable message frame configuration in addition to selection
of standard message frames.
16 840Di Specific Data and Functions
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