2-3
Communications Processor CP 541
EWA 4NEB 812 6188-02
2.2
DP Connection
The DP connection is data-oriented non-safety-related communication be-
tween a DP master and a DP slave.
The DP connection can contain up to 16 words of data in each direction.
You install the DP connection in the connected programmable controller as a
connection with node address 0 (see Section 4.3).
Node address 0 sent by the connected programmable controller is converted
to the DP master station number by the CP 541.
PLC
CP
541
0
DP
master
SINEC L2
Figure 2-2 Address Conversion for DP Connection
The CP 541 monitors the DP connection to the programmable controller.
Monitoring is active as soon as the CP 541 is accepted in the DP cycle and
the programmable controller has sent the first DP message.
When writing the user program in the programmable controller, ensure that
cyclic DP data are presented within the response monitoring time (DPWD,
see Appendix C.5).
When the CP 541 no longer receives DP messages from the programmable
controller, it emits a diagnosis to the DP master.
As soon as the CP 541 is accepted in the DP cycle and the DP watchdog is
activated, the CP 541 monitors the connection to the DP master.
If the DP connection to the DP master fails, the CP 541 informs the program-
mable controller (see Section 6.4).
With the S5-115F, you can install either the DP connection or a non-safety-
related PLC-PLC connection. Both connections are not simultaneously pos-
sible because they both use node address 0.
Introduction
Message Length
Parameter
Assignment
Address
Conversion
Monitoring of the
Connected PLC
DP Master
Monitoring
Note Relating to
the S5-115F
Communication Modes
