Comtrol DeviceMaster Up, Руководство пользователя

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10 - DeviceMaster UP PROFINET CbA User Guide : 2000409 Rev. D Chapter 2. Programming Interface
Transfer Modes
2.2.2. Transfer Modes
DeviceMaster UP supports the following transfer modes over Industrial Ethernet:
• Cyclical - Use this transfer mode for time-critical data.
• Acyclical - Use this transfer mode for engineering data and non time-critical data.
The transfer modes are selectable properties for the DeviceMaster UP. You can change these properties
through SIMATIC iMap. The following table displays the supported transfer properties for DeviceMaster UP.
For additional information, see 2.5.6. Maximum Length for a Serial Packet on Page 15.
2.2.3. Quality of Service (QOS)
Each transfer mode has a quality of service:
• Transfer frequency (cyclical) - The time after a data item is transferred again in cyclical transfer
mode (for example, every 10 ms). Use this transfer mode for Soft Real-Time (SRT).
• Scanning frequency (acyclical) - Determines how frequently the data is polled (for example, every 100
ms) in acyclical transfer mode. The scanning frequency is the maximum time that elapses before a change
in value is transferred.
You can set a transfer or scanning frequency to fast, medium, or low frequency. You can also change the
transfer value within the following ranges:
• Cyclical range - 10 ms to 1000 ms.
• Acyclical range - 100 to 1000 ms
For additional information, see 2.5.6. Maximum Length for a Serial Packet on Page 15 and 4.6. Setting a
Project’s Transfer Properties on Page 37.
Transfer Mode Frequency Value
Cyclical
Fast 10 ms
Medium 50 ms
Slow 100 ms
Acyclical
Fast 100 ms†
Medium 500 ms
Slow 1000 ms
†
The DeviceMaster UP has a minimum value of 100 ms for
acyclical transfer mode. To change this value to 100 ms,
see the instructions in
4.6. Setting a Project’s Transfer
Properties
on Page 37