Coordinating Failsafe Data Interchange In The User Program - Siemens SIMATIC S5-95F Manual

S5-95F

13.3.2 Coordinating Failsafe Data Interchange in the User Program

Once all parameters have been initialized, the user program for data interchange must be written.
This program must access coordination info in the User Valid Byte (refer to Figure 13-10).
Transmitter (source)
Internal RAM memory
User Valid Byte
Control program for
data interchange
Receive mailbox
Send mailbox
L1 bus
Figure 13-10. Data Interchange Between Transmitter and Receiver (Principle)
EWA 4NEB 812 6210-02
Internal RAM memory
DB252
or
DB253
S5-95F on SINEC L1
Receiver (destination)
User Valid Byte
Control program for
data interchange
Receive mailbox
Send mailbox
DB252
or
DB253
13-15