Siemens SIMATIC S5 Equipment Manual page 189

I
Programming Instructions
9.6.4 Reading the Absolute Value (Actual Value)
To read and evaluate actual absolute values, parameterized tracks or initial and end setpoints, a
prompt for updating bytes 4,5, and 6 of the output register must be given.
Byte 4 must provide an L read prompt.
L = Read
= Actual value display
End = End setpoint
When byte 4 is switched to the data bus, the following
bit patterns are ossible for prompting the absolute
values in the fol owing read cycle: Read the current
actual value of a channel via any track number.
For channel 1 track number O to 15 (any)
For channel 2 track number 16 to 31 (an )
Example: Channel 2 (track number = 16
Note: Initial bit must be "O".
Software-based deletion:
If the read bit = "1", the actual value bit = "1" and the end bit = "1", all
9 – 68
7 6 3 2 1
7 3 2 1
6
15 14 11 10 9
—
23 22 16
30 27 26 25 24
31
4 Absolute 10 1 Absolute 10 0
5 Absolute 10 Absolute 10 Z
3
P
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Bit 7654
I
Byte O
NV
1
2
3
4
0
o
8
AG
R 02/92
3 21
Track No.
0-31
End= 1
0
1 0 1 1 0
I
3
1 0
Read Byte 7
N
S P
Write Byte 4
I
Read byte 7
1969, Order No.: 6ES5 998-0KD21
I . . . .
0
I
I