Siemens SIMATIC S5-95U - 3 Computer Link with 3964(R) Transmission Protocol

S5-95U, Second Serial Interface Computer Link with 3964(R) Transmission Protocol
3 Computer Link with 3964(R) Transmission
Protocol
This section covers the following:
• Possible communication partners for the S5-95U
• How to connect communication partners to the SI2 interface
• Data traffic via computer link
• Parameter assignment of the PLCs
• PLC program for the computer link (example)
• 3964(R) transmission protocol.
The 3964(R) transmission protocol is SIEMENS-specific and is therefore ideal for the connection of
SIEMENS devices. In the meantime, there is also a range of third-party devices which offer the
3964(R) transmission protocol.
The computer link with 3964(R) transmission protocol is used for the connection of two
communication partners. The communication partners are equal, i.e. each partner can send data
without a request from the other partner.
The computer link with 3964(R) transmission protocol is only possible via the second serial interface
of the S5-95U (SI2).
Figure 3-1 Node in a Computer Link with 3964(R) Transmission Protocol
S5-95U
SIEMENS
device
Special cable ( Section 3.1)
Note
You can also interface SIMATIC components via a computer link, e.g. two S5-95U PLCs.
However, in general it is more favorable to link SIMATIC components via a point-to-point
link ( Section 2).
EWA 4NEB 812 6095-02 3-1