Siemens CU240S DP-F - Page 227

Functions
8.7 Communication via USS
Control Units CU240S
Operating Instructions, 11/2006, A5E00766042B AA
8-31
Parameter index (IND) 2
nd
word
The parameter index (IND) is always a 16-bit value.
3.(
,1'
3:(
3.:
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

VW
ZRUG

QG
ZRUG

UG
DQG 
WK
ZRUG
3DUDPHWHULQGH[,';3DJHLQGH[
Figure 8-22 IND structure
● The low byte of IND is used for the parameter index IDX and can have values between 0
and 255. The IND low byte IDX = 255 has a special meaning. For this index value, the
task is referred to the complete array or the complete parameter description.
● Bits 8 and 9 are always 0.
● Bits 10 to 15 are interpreted as a page index to determine the full parameter number. The
bPNU (bits 0 to 10 of PKE) is limited to values between 0 and 1999. The parameter
number is a concatenation of bPNU and a multiplier determined by the 6 higher bits of
IND. It is defined als follows:
,1'
               
DGFEI H
The full PNU is derived as follows: PNU = 2000
*
(a + b
*
2 + c
*
4 + d
*
8 + e
*
16 + f
*
32) +
bPNU
Table 8-13 Regulation for setting the PNU
Page index Bit
Parameter range
a d c b f e 9 8
Hex value + bPNU
0000 – 1999 0 0 0 0 0 0 0 0 0 0 – 7CF
2000 – 3999 1 0 0 0 0 0 0 0 0x80 0 – 7CF
4000 – 5999 0 0 0 1 0 0 0 0 0x10 0 – 7CF
6000 – 7999 1 0 0 1 0 0 0 0 0x90 0 – 7CF
8000 – 9999 0 0 1 0 0 0 0 0 0x20 0 – 7CF
…
60000 – 61999 0 1 1 1 0 1 0 0 0x74 0 – 7CF