Data For S5-Compatible Communication (Send/Receive Interface) On Fdl Connections - Siemens CP 342–5 Manual

Note
The reaction times listed above are only intended as a guideline and only apply
when no other services (for example PG functions) are processed on the CP.
1.2.4 Data for S5-Compatible Communication (SEND/RECEIVE inter-
face) on FDL Connections:
The following data are important when operating FDL connections (Specified, Free
Layer 2 (SDA and SDN), Broadcast, Multicast):
Table 1-6
Feature
Total number of FDL connections that can be
operated.
Size of the transferable data area for FDL
connections
Reaction Times of FDL Connections
To calculate the reaction times when operating with FDL connections, the runtime
of the function blocks required in the S7-300 CPU (AG_SEND, AG_RECV) is the
decisive factor.
Table 1-7
Components
Runtime on the CPU 314-1
(6ES7 314–1AE04–0AB0)
Manual CP 342–5 / CP 342–5 FO
C79000–G8976–C146/01
maximum 16
maximum 240 bytes per specified FDL connection
(for sending and receiving);
Free layer 2, broadcast and multicast:
Up to 236 bytes of user data can be transferred per
job. The job header occupies an additional 4 bytes.
Explanation / Values
Per AG_SEND block:
S
0,2 – 3,2 ms at 16 bytes
S
0,2 – 5,7 ms at 240 bytes
Explanation / Values
Per AG_RECV block:
S
0,2 – 3,5 ms at 16 bytes
S
0,3 – 6,4 ms at 240 bytes
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