DB1 Parameters, DB1 PAFE, TRT S5-95U, SINEC L2
Example of Calculating the Target Rotation Time
Four active and two passive stations are connected to the SINEC L2 network.
TLN of the active stations: 1, 2, 3, and 4
TLN of the passive stations: 40, 41
HSA: 4
BDR: 500 kBaud
SET: 0
ST: 400 bit time units
SDT1: 12 bit time units
SDT2: 360 bit time units
Data traffic for
• Station 1: ZP master SRD frame with 4 bytes of transmit data to station 40:
2 bytes of received data from station 40;
SRD frame with 10 bytes of transmit data to station 41;
10 bytes of received data from station 41
PLC to PLC conn. SDA frame with 30 bytes of transmit data to station 2:
PLC to PLC conn. SDA frame with 30 bytes of transmit data to station 3;
PLC to PLC conn. SDA frame with 30 bytes of transmit data to station 4
• Station 2: PLC to PLC conn. SDA frame with 30 bytes of transmit data to station 1
• Station 3: PLC to PLC conn. SDA frame with 30 bytes of transmit data to station 1
• Station 4: PLC to PLC conn. SDA frame with 30 bytes of transmit data to station 1
Calculation of the basic frame load and the required time:
Token frames: 4·145 = 580 bit times units
Station 1: 1·SRD with 6 bytes of net data 500+6·11 = 566 bit times units
1·SRD with 20 bytes of net data 500+20·11 = 720 bit times units
3·SDA with 30 bytes of net data 3·(425+30·11) = 2265 bit times units
Station 2: 1·SDA with 30 bytes of net data 425+30·11 = 755 bit times units
Station 3: 1·SDA with 30 bytes of net data 425+30·11 = 755 bit times units
Station 4: 1·SDA with 30 bytes of net data 425+30·11 = 755 bit times units
Sum (rounded up): = 6400 bit times units
1
500 kBaud
= 12800 µsTarget rotation time to set: 6400 bit time units ·
Tip to optimize the target rotation time:
• Assign the station addresses in ascending order (1, 2, ...).
A-6
EWA 4NEB 812 6112-02
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