S5-95U, Second Serial Interface Description of the System
Selection of communications mechanism
The optimum communications mechanism for all communication partners is not determined by the
device configuration alone. Thus it is possible to use the point-to-point link, the computer link or the
ASCII driver for PLCs and CPs as communication partners of the S5-95U.
These three communications mechanisms are therefore compared in the following table
( Table 1-1).
You can decide by means of the table which are the important criteria for your specific application
and consequently, which communications mechanism you use.
Table 1-1 Criteria for Selecting the Communications Mechanism
* e.g. transmission rate, data format and parity ( Section 3; 4)
SIMATIC
PLC
SIEMENS
Device
Interface with
Possible Possible
Yes Possible
Third-
Party
Device
Possible Possible Yes
Yes
Possible
Selection Criteria ASCII Driver Point-to-P. Link w.
SINEC L1 Protocol
3964(R) Computer
link
Yes
Safe Data Transmission
Ensured by Protocol
Yes No
Maximum Number of
Net Data per Request
1024 bytes1024 bytes64 bytes
Flexible Transmission
Format can be used
*
YesNo Yes
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