PROFINET Implementation Details 27 (258)
4.8 Fast Start Up
4.8.1 General Information
The Fast Start Up (FSU) function enables PROFINET IO devices, connected to the network, to
power up quickly. This is useful in, for example, robot applications, where rapid retooling is nec-
essary. With FSU activated, the module will send a DCP Hello message as soon as possible
after power-on.
This function is enabled by two GSD keywords: PowerOnToCommReady and DCP_HelloSup-
ported. The activation is made from the PLC configuration tool.
The FSU time is defined as the number of milliseconds (ms) from hardware reset (or power-on)
until the module enters the PROCESS_ACTIVE state. On PROFINET, it is recommended to try
to reach a FSU time <= 500 ms.
To enable FSU, set values according to the following (listed for the Device Access Point(s)):
PowerOnToComm-
Ready
FSU time, in milliseconds (ms). This value must be measured by the customer.
DCP_HelloSupported Value: true.
ParameterizationSpee-
dupSupported
Value: true
To disable FSU, set the keywords to the following values:
PowerOnToComm-
Ready
Remove this keyword from the GSD file.
DCP_HelloSupported Value: false.
ParameterizationSpee-
dupSupported
REmove this keyword from the GSD file.
4.8.2 How to Improve the FSU Time
• Issue as few commands as possible to the module during the SETUP state.
• Respond as fast as possible to all commands issued by the module after setup is complete.
• If there is record data in the GSD file, use attribute #4 in the Application Object (FFh), in-
stance #1 (Parameter Control Sum). During the next start-up, this parameter data is al-
ready saved in the module’s nonvolatile storage and will not be sent to the application.
4.8.3 Fast Start Up Configuration with STEP7
The example below shows the procedure when the Siemens tool STEP7 is used for
configuration.
Anybus
®
CompactCom
™
40 PROFINET IRT Network Guide SCM-1202-023 EN 1.8
To Next Page
Loading...
Need help?
General
