Communication PROFIBUS DP/PROFINET IO 10.3 Communications via PROFINET IO

Refresh time

The refresh time is in the range of 1 ms, 2 ms and 4 ms. The real refresh time depends on the bus load, the devices used and the quality structure of the I/O data. The refresh time is a multiple of the send clock.

10.3.3.3PROFINET IO with IRT - Overview

Overview

PROFINET IO with IRT distinguishes itself through the separate time domains for IRT, RT and TCP/IP communication. This is ensured by high-precision hardware-supported cycle monitoring.

 

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Figure 10-47 IRT Communication - Overview

PROFINET IO with IRT is available in two versions:

IRTflex (flexible) with fixed bandwidth reservation (not available in FW2.5 SP1)

IRTtop (top performance) with planned IRT communication

Time synchronization and isochronous mode on PROFINET IO with IRTtop

In addition, a high-performance and isochronous connection to the application with low load on the application CPU is also ensured. Isochronous data transfer with cycle times well below one millisecond and with a deviation in the cycle start (jitter) of less than a microsecond provide sufficient performance reserves for demanding motion control applications.

In contrast to standard Ethernet and PROFINET IO with RT, the message frames for PROFINET IO with IRT are transmitted as scheduled.

Sync domain

The sync domain can be configured in the HW Config. SINAMICS S120 is an IO device and must be assigned to a sync master as a sync slave.

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Drive Functions

Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4

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Image 446
Efficient Networks S120 manual Refresh time, Profinet IO with IRT Overview, Sync domain