5-4
Communications Processor CP 541
EWA 4NEB 812 6188-02
5.1.2
Safety-Related Broadcast via FDL
With the safety-related broadcast, you transwith messages to all failsafe L2
stations listening on the SINEC L2 via FDL and the set SAP, and using ser-
vice SDN.
Each safety-related broadcast message can contain up to 60 bytes of net data
plus 4 bytes for data detection and correction.
The CP 541 converts a broadcast message from the connected programmable
controller to a multicast message on SINEC L2. A service access point (SAP)
is used for this conversion.
SAP (service access point); the CP 541 uses default SAP 52 for the broad-
cast. You can change the SAP with parameter BSAP in the COM block of
DB1.
SDN (send data with no Acknowledge) ; SDN of the PROFIBUS protocol
is used for the broadcast.
You install the broadcast with COM 95F/COM 115F. COM 95F/COM 115F
uses node address 31. This node address is converted by the CP 541 to station
number 127.
PLC
CP
541
31
SINEC L2
127
Figure 5-2 Address Conversion for Broadcast
If you receive a safety-related broadcast with a non-failsafe SINEC L2 sta-
tion, you must not evaluate the first four bytes of the safety-related broadcast
message.
The first four bytes are used by the failsafe programmable controllers of the
SIMATIC S5 family for data security information.
As before, you can configure the broadcast in the connected programmable
controller with COM 95F or COM 115F. In the connected programmable
controller, you must not take into account any changes caused by the CP 541.
Introduction
Message Length
Implementation
Address
Conversion
Non-Failsafe
Station
Configuring the
Broadcast
CP 541 with S5-95F/S5-115F
