Characteristic Data Of Fdl Communication; Characteristics Of S7 Communication - Siemens S7-1500 PROFIBUS Operating Instructions Manual

1.3.4

Characteristic data of FDL communication

Characteristic data FDL
The characteristic data is important when operating FDL connections (specified, free layer 2
(SDA and SDN), broadcast, multicast):
Table 1- 2 Characteristic data FDL
Characteristic
Total number of S7 connections via
PROFIBUS and FDL connections together
• Of which, FDL connections
• Size of the transferable data area for FDL
connections
Note
Connection resources of the CPU
Depending on the CPU type, different numbers of connection resources are available. The
number of connection resources is the decisive factor for the number of configurable
connections. For this reason, lower values than specified here can result.
You will find detailed information on the topic of connection resources in the
"Communication" function manual:
Link: (http://support.automation.siemens.com/WW/view/en/59192925)
1.3.5

Characteristics of S7 communication

Characteristics of S7 communication
The following information is important when operating S7 connections:
Table 1- 3
Characteristic
Total number of S7 connections via
PROFIBUS and FDL connections
together
•
SIMATIC CM 1542-5
Operating Instructions, 01/2023, C79000-G8976-C290-07
Explanation / values
Operable in total: Max. 48
• Max. 30
• 1...240 bytes max. per specified FDL connection (for sending and
receiving)
• Free layer 2, broadcast and multicast:
Up to 236 bytes of payload can be transferred per job. The job header
occupies an additional 4 bytes.
Characteristics of S7 connections
Of which, S7 connections via
PROFIBUS
1.3 Configuration limits and performance data
Explanation / values
Operable in total: Max. 48
• Max. 48
The value depends on the S7-1500 CPU being used.
Application and functions
15