Comtrol DeviceMaster Up, Руководство пользователя

Страница: 15 / 48

Chapter 2. Programming Interface DeviceMaster UP PROFINET CbA User Guide : 2000409 Rev. D - 15
Maximum Length for a Serial Packet
2.5.6. Maximum Length for a Serial Packet
When you make SIMATIC iMap connections, you need to consider maximum length and QOS for serial
packets. For more information on creating connections, see
4.6. Setting a Project’s Transfer Properties on Page
37.
2.5.6.1. DeviceMaster UP (1-Port)
If you have a DeviceMaster UP 1-port, you can configure the connections to a port for one of the following
QOS options:
• Cyclical
- Fast
- Medium
- Slow
• Acyclical
- Fast
- Medium
- Slow
The port allows a serial packet length of 128 bytes.
The following example shows the serial packet length and optimal QOS setting for a DeviceMaster UP 1-port.
Due to PROFINET CbA restrictions, the packet lengths are fixed as shown in the following table.
2.5.6.2. DeviceMaster UP (4-Port)
If you have a DeviceMaster UP 4-port, you can configure the connections for two ports to use one QOS setting
(for example, cyclical fast). The connections to the other two ports must be configured to another QOS setting
(for example, cyclical medium).
Note: You cannot configure the connections to all ports to the same QOS setting.
The following example shows the serial packet length and optimal QOS setting for each port on a
DeviceMaster UP 4-port. Due to PROFINET CbA restrictions, the serial packet lengths are fixed as shown in
the following table.
For more information, see 2.2. PROFINET CbA Communication Properties on Page 9.
Port Number Serial Packet Length Recommended QOS
0 128 Cyclical Fast
Port Number Serial Packet Length Recommended QOS
0 128 Cyclical Fast
1 64 Cyclical Fast
2 128 Cyclical Medium
3 64 Cyclical Medium