06.03
7.3 SIMATIC S7 project
7-229
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:
Factor
General
Equidistant bus cycle activated
Network settings in msec:
Synchronize drive to equidistant DP cycle
Clock synchronization
Configuration
Cyclic portion of equidistant master
Setpoint acceptance
[msec]:
Actual-value sensing
[msec]:
Basic time [msec]
Master application cycle
[msec]:
2.000
Equidistant DP cycle:
0.872
DP cycle [msec]:
2.000
2.000
2.000
0.125
0.125
0.125
8
2
16
1
1.000
0.250
DP slave properties
Factor
Factor
Factor
Basic time [msec]
Basic time [msec]
Basic time [msec]
=
=
=
=
x
x
x
x
T
I
TDX
T
DP
T
O
Fig. 7-6
Dialog: DP slave properties (cutout)
1. Equidistant DP cycle (T
DP
)
T
DP
= 2* n * 125
m
sec; where n
w
4 ( => minimum T
DP
= 1 msec)
2. Setpoint acceptance (T
o
)
(TDX + 125
m
sec)
v
T
O
t
T
DP
; where TDX = T
DX
, rounded up to an
integral multiple of 125
m
sec
3. Actual-value sensing (T
i
)
250
m
sec
v
T
I
v
T
DP
4. T
I
and T
O
must not be in the same 125
m
sec cycle
D
T
,
0; where
D
T = T
DP –
T
I –
T
O
5. If T
O
== (T
DP
– 125
m
sec)
Then the following must be valid for T
I
: T
I
u
3 * 125
m
sec
6. If T
O
== (TDX + 125
m
sec)
Then the following must be valid for (T
I
+ T
O
): (T
I
+ T
O
)
,
(T
DP
+ 125
m
sec)
T
DP
1*125
m
sec
T
I
2*125
m
sec
3*125
m
sec
4*125
m
sec
5*125
m
sec 6*125
m
sec
7*125
m
sec
8*125
m
sec
T
O
ÉÉÉÉÉÉÉÉÉÉÉÉÉÉ
ÉÉÉÉÉÉÉÉÉÉÉÉÉÉ
Min.: 2*125
m
sec
ÇÇÇÇÇÇÇÇÇÇ
Max.: T
DP
D
T
0
Min.: TDX+125
m
sec
T
DX
Max.: T
DP
Fig. 7-7
Graphical illustration of the boundary conditions
Setting the final
parameters for
ADI4
Boundary
conditions
(SW 2.1 and
higher)
7 PROFIBUS DP Communication
