Characteristic Data Of Open Communications Services (Send/Receive Interface) Over Fdl Connections - Siemens CP 342-5 Manual

Communications processor for connection of simatic s7-300 / to profibus dp
Hide thumbs


Table of Contents
Characteristic data of open communications services (SEND/RECEIVE
interface) over FDL connections
General characteristic data
The characteristic data is important when operating FDL connections (specified, free layer 2
(SDA and SDN), broadcast, multicast):
Total number of FDL connections that can be
Size of the transferable data area on FDL con-
Execution times of the program blocks AG_SEND / AG_RECV
The following table will help you to calculate the CPU cycle times (OB1) for FDL
connections. The table contains the execution time of the FCs (FC AG_SEND, FC
AG_RECV) required for DP processing on the S7-300 / C7-300 CPU.
Execution time on the CPU
314C-2DP (6ES7 314-6CF00-
Execution time on the CPU 317-
2PN/DP (6ES7 317-2EJ10-
Time response on FDL connections
Refer to the following table for transmission rates with FDL connections dependent on the
following parameters:
● Frame length (number of bytes)
● CPU type
The values were measured while sending or receiving successively (at a transmission rate of
1.5 Mbps; bus profile standard; 9 nodes).
Table 1- 1
Frame length
8 bytes
128 bytes
240 bytes
CP 342-5 / CP 342-5 FO
Manual, 07/2017, C79000-G8976-C146-10
Explanation / values
Per AG_SEND block call:
<5.1 ms at <=240 bytes
Per AG_SEND block call:
<2.4 ms at <=240 bytes
Number of FDL frames per second for CPU 317
Application and functions
1.4 Performance data and behavior in operation
Explanation / values
16 max.
1-240 bytes maximum per specified FDL connec-
tion (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
Per AG_RECV block call:
<5.7 ms at <=240 bytes
Per AG_RECV block call:
<2.8 ms at <=240 bytes
Number of FDL frames per second
140 / s
138 / s
135 / s

Hide quick links:


Table of Contents

  Also See for Siemens CP 342-5

This manual is also suitable for:

Cp 342-5 fo

Table of Contents