Siemens SINAMICS S150 - Page 251

Operation
6.8 PROFINET IO
Drive converter cabinet units
Operating Instructions, 07/07, A5E00288214A
251
RT class RT IRTflex IRTtop
Determinism Variance of the transmission
duration due to TCP/IP
telegrams being underway.
Guaranteed transmission of
the IRTflex telegrams in the
current cycle by the reserved
bandwidth.
Exactly planned transfer;
times for transmission and
receiving are guaranteed for
any topologies.
Reload the network
configuration after a change
- Only when the size of the
IRTflex interval needs to be
modified (reservation of
reserves is possible).
Always when the topology or
the communications
relationships change.
Cross-traffic (controller-
controller):
- - Yes
Maximum switching depth
(number of switches in one
line)
10 at 1 ms 20 20
Synchronization accuracy - Forwarding of the sync
telegram in software.
Forwarding of the sync
telegram in software.
accuracy <1 µs)
Possible transmission cycle
clocks (observe any device-
specific restrictions)
1,000; 2,000; 4,000 µs 500 (planned as of FW2.5
SP1); 1,000; 2,000; 4,000 µs
500 (planned as of FW2.5
SP1)/1,000 – 4,000 µs in
increments of 125 µs. The
increment depends on the
controller.
Set the RT class
The IO controller determines which RT class its IO system supports, by setting the real time
class at its controller interface. If IRTtop is set, it is not possible to operate any IRTflex
devices on the IO controller and conversely. RT devices can always be operated, even if IRT
classes are set.
You can set the RT class in the HW Config for the associated PROFINET device.
1. Double-click the PROFINET board entry in the module in HW Config.
The Properties dialog box is called.
2. Select the realtime class for RT class in the Synchronization tab.
3. Click OK to confirm.