Specifying Iso Transport Dynamics Properties - Siemens S7-300 Configuration Manual

Configuring communications connections
5.4 Configuring ISO transport connection properties
● If you make your entries in hexadecimal, printable characters are displayed as an ASCII
value (8 hexadecimal characters are visible). If you enter non-printable characters, the
ASCII display changes to gray (ASCII input no longer possible) and the non-printable
characters are displayed as a period.
Note
Use at least 3 bytes to ensure unique addressing.
Local and remote TSAPs
Remote and local TSAPs can be identical since the connection is uniquely identified by the
different MAC addresses. If more than one connection is required between two stations, the
TSAPs must be different.
Default TSAPs
During configuration of the local and remote TSAPs, default values (modifiable) are
proposed (for example ISO-1 for the first connection between two partners). If new
connections are configured between the same partners, the default values are automatically
incremented (for example ISO-2 etc.). With a new connection to a new partner, the value
ISO-1 is used again.
5.4.2

Specifying ISO transport dynamics properties

"Dynamics" parameter group
In the "Dynamics" parameter group, you will see the relevant timers and counters of the
connection. You can adopt these default values.
When necessary (for example when linking to third-party systems), the timers and counters
and therefore the dynamic response of the connection can also be set individually.
Attributes
Connection establishment
Retransmission time
Data transfer
Retransmission time
100
Description
The retransmission time specifies the time after which
connection establishment is started again (range: 1... 60 s;
default: 5 s).
If connection establishment is active
•
If connection establishment is passive
•
Exception: If an existing partner rejects the connection
establishment using a Disconnect Request, the connection
establishment is repeated after 5 seconds (default value).
This parameter specifies the time after which a failed send
attempt is started again (100 - 30000 ms, DEFAULT 1000 ms).
Configuring and commissioning S7 CPs for Industrial Ethernet
Configuration Manual, 09/2013, C79000-G8976-C182-13
Access
modifiable
•
(irrelevant)
•
modifiable