Siemens SINUMERIK 840Di Manual page 229
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06.03
Setting the final
parameters for
ADI4
Boundary
conditions
(SW 2.1 and
higher)
Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
Once the components (drives, ADI4, I/O devices, etc.) have been inserted in the
configuration and parameterized, the parameters are set for the equidistant DP
cycle while taking the framework conditions listed below into consideration, (see
Subsection 7.3.8, page 7-238).
When setting the parameters for the equidistant DP cycle, with ADI4 it is neces-
sary to take the following framework conditions into account:
DP slave properties
General
Configuration
Clock synchronization
Synchronize drive to equidistant DP cycle
Network settings in msec:
Equidistant bus cycle activated
Equidistant DP cycle:
2.000
T
DP
Master application cycle
2.000
[msec]:
DP cycle [msec]:
2.000
T
I
Actual-value sensing
0.250
[msec]:
T
O
Setpoint acceptance
1.000
[msec]:
Fig. 7-6
Dialog: DP slave properties (cutout)
1. Equidistant DP cycle (T
= 2* n * 125msec; where n w 4 ( => minimum T
T
DP
2. Setpoint acceptance (T
(TDX + 125msec) v T
integral multiple of 125msec
3. Actual-value sensing (T
250msec v T
v T
I
4. T
and T
must not be in the same 125msec cycle
I
O
DT , 0; where DT = T
5. If T
== (T
– 125msec)
O
DP
Then the following must be valid for T
6. If T
== (TDX + 125msec)
O
Then the following must be valid for (T
É É É É É É É É É É É É É É
Max.: T
DP
É É É É É É É É É É É É É É
T
O
T
DX
1*125msec
2*125msec 3*125msec 4*125msec 5*125msec 6*125msec 7*125msec 8*125msec
Fig. 7-7
Graphical illustration of the boundary conditions
7 PROFIBUS DP Communication
Cyclic portion of equidistant master
Factor
=
1
x
Factor
x
=
16
Factor
x
=
2
Factor
x
=
8
)
DP
)
o
t T
; where TDX = T
O
DP
)
i
DP
T
T
DP –
I –
O
u 3 * 125msec
: T
I
I
+ T
): (T
I
O
DT
0
Min.: 2*125msec
Min.: TDX+125msec
Ç Ç Ç Ç Ç Ç Ç Ç Ç Ç
T
DP
7.3 SIMATIC S7 project
0.872
TDX
Basic time [msec]
2.000
Basic time [msec]
0.125
Basic time [msec]
0.125
Basic time [msec]
0.125
= 1 msec)
DP
, rounded up to an
DX
) , (T
+ T
+ 125msec)
I
O
DP
T
I
Max.: T
DP
7-229
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