S5-95U, SINEC L2 DB1 Parameters, DB1 PAFE, TRT
Calculating the Target Rotation Time
Assuming that you have defined the SET, ST, SDT 1 and SDT 2 arguments as listed in the table
entitled "Defining the Arguments of Basic Parameters for the S5-95U as a Function of the Baud
Rate" on page A-4, you can calculate the target rotation time required for the following types of
transmission:
• Standard connection
• PLC to PLC connection
• Cyclical I/O
Proceed as follows to calculate the target rotation time:
Determine the maximum possible number of frames for each different type of frame (for
example, SDN or SDA frames)
Out of these data and using the following table and the explanations to the token frame,
calculate the basic load. The values given in the table are specified in bit time units.
Add 11 bit time units to the basic load for every byte transmitted. The result is your worst-case
target rotation time.
Baud Rate in kbaud
Type of Frame
15009.6 19.2 93.75 187.5 500
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Token
1
SDN
2
SDA
3
SRD
4
70 70 70 75 145 345
170 190 210 230 480 1120
180 185 190 230 425 1040
270 270 270 280 500 1160
1
Number of token frames = number of active stations on the SINEC L2 network
2
SDN (Send Data with No acknowledge) = data transmission without acknowledgement;for standard
connection (only broadcast)
3
SDA (Send Data with Acknowledge) = data transmission with acknowledgement; for standard connection
(not broadcast) and PLC to PLC connection
4
SRD (Send and Request Data) = data transmission and data request with comfirmation ; for Cyclic I/O
An example of calculating the target rotation time can be found on the next pag
EWA 4NEB 812 6112-02
A-5
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