5-18
Engineering Guide CDA3000
5 Communication and user modules
5.4.3 Communication
via PROFIBUS-
DP
By way of the PROFIBUS-DP the drive units can be controlled and their
parameters set in accordance with the profile for variable-speed drives
(PROFIDRIVE).
The unambiguous transfer of parameters and process data is achieved by
the configuration of “parameter process data objects” (PPOs). The
PROFIBUS-DP Gateway supports PPOs 1 to 4.
Figure 5.12
Parameter process data object for user data traffic
The PPO illustrated in Figure 5.12 includes a control word and a refe-
rence value for process data transfer from the master to the slave as well
as a status word and an actual value for the reverse direction. The param-
eter area in the PPO is optional, which means it must be planned as
required during slave configuration and is then transferred together with
the process data area on a permanent basis in a cyclic telegram.
+
+
+
+
+
+
+
+
DP-Master
PLC
P R O F I B U S - D P
ON
1
2
3
4
5
6
7
Val
ue
6432
168
42
1
ON
1
2
3
4
5
6
7
Add
ress
: 3
Clic
k
Clic
k
P a r a m e t e r c h a n n e l
P r o c e s s d a t a
˙
˚
C P - D P 1
