Pilz PSSnet SHL 8T MRP - Manual (Page 130)

Network load control
PSSnet SHL - Basic Configuration
Pilz GmbH & Co. KG, Felix- Wankel Str. 2, 73760 Ostfildern
8.5 Flow control
131
Figure 35: Example of flow control
„
Flow control with a full duplex link
In the example (see fig. 35) there is a full duplex link between Workstation
2 and the device.
Before the send queue of port 2 overflows, the device sends a request to
Workstation 2 to include a small break in the sending transmission.
„
Flow control with a half duplex link
In the example (see fig. 35) there is a half duplex link between Worksta-
tion 2 and the device.
Before the send queue of port 2 overflows, the device sends data back so
that Workstation 2 detects a collision and interrupts the sending process.
Switch
Port 3 Port 2
Port 1 Port 4
Workstation 1 Workstation 2 Workstation 3 Workstation 4