Siemens SIMATIC S5 CP 523 Manual page 195

CP 523
8.1.4 Schematic of the Principle of Operation of "SEND" FB 200
Note:
This section is intended merely to explain the method of operation of "SEND" FB 200. You do
not require this information to use the "SEND" FB 200.
FB 200 services the Send request according to the following schematic:
Flag error in status
byte
EWA 4NEB 811 6044-02a
Read status of the CP 523
Yes
mailbox
occupied?
Check the "SEND" FB parameters
Yes
Parameter
Calculate the number of Send frames
Establish "SEND" connection to the CP 523
Read job acknowledgement from CP 523
Yes
Acknowledge-
ment with error?
Transfer send data to CP 523
Figure 8-2. Schematic for "Send Frame" (FB 200)
Using the "SEND" and "Receive" Function Blocks
Send
No
error?
No
No
END
Segment 2
Segment 3
Segment 4
Segment 5
Segment 6
Segment 7
8-5