Requirements - Siemens SINUMERIK 840Di Manual
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06.03
S
Fig. 16-2 shows how the process data of the message frame are mapped onto system variable
$VA_DP_ACT_TEL:
Bit 31...16 = bit 15
31
16
15
0
PDA1
. . . . .
Index n = 0
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
Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
16.2 Expanded message frame configuration (SW 2.2 and higher)
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.
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.
PDA for expanded message frame
Process data: Standard
Process data: addi-
frame
tional drive data
15
0
15
0
15
PDA1
. . . . .
PDAx
PDAx1
Bit 31...16 = bit 15 Bit 31...16 = bit 15
31
31
16
15
0
16
PDAx
PDAx+1
Index n = x
Index n = x+1
System variable $VA_DP_ACT_TEL[n, a]
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
0
15
0
. . . . .
PDAy
Bit 31...16 = bit 15
0
15
. . . . .
31
16
0
15
PDAy
Index n = y
16-503
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