Computer Link with 3964(R) Transmission Protocol
S5-95U, Second Serial Interface
A number of conventions must be agreed upon for a data transmission procedure: codes, modes,
transmission rates and the sequence of transmission.
Difference between the 3964 and 3964R transmission protocols:
The 3964R transmission protocol differs from the 3964 transmission protocol by a block check
character (BCC) generated and sent at the end of a transmitted data block. This block check
character forms the vertical parity across all transmitted bits of a block with the same significance.
Advantage as compared to 3964 transmission protocol:
Data transmission with the 3964R trans-
mission protocol is safer.
Section 3.6 explains in detail the procedure of data transmission with the 3964(R) transmission
protocol. For startup of the S5-95U, this knowledge is not necessary.
The following devices are suitable communication partners for the S5-95U:
•
SICOMP PC
•
SICOMP M (computer system)
•
Teleperm M (process control system)
•
MOBY-M (identification system)
•
SIMATIC communication partners (e.g. CP 523, CP 525, S5-95U with two serial interfaces)
Note
If the computer link is activated, no other functions are possible at the SI2 interface (e.g.
programmer/operator panel, ASCII driver).
Proceed as follows for startup of the S5-95U:
Link the S5-95U with the communication partner via the SI2 interface ( Section 3.1).
Establish Data Set Ready on the communication partner.
Parameterize the computer link in DB1 of the S5-95U ( Section 3.2).
Write the PLC program into the programmer (for an example Section 3.5).
Transmit DB1 and the PLC program into the S5-95U.
Switch the mode selector of the S5-95U from STOP to RUN.
Also note Section 4.2
”
Startup of a system
”
in the S5-90U/S5-95U System Manual.
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EWA 4NEB 812 6095-02