Siemens Industrial Ethernet Switches SCALANCE X-200 User Manual download pdf (Page 283)

Technical specifications

SCALANCE X-200

Operating Instructions, 12/2011, A5E00349864-19

283

Note

Note the mounting position of the SCALANCE XF-200 and X204-2TS

If a SCALANCE XF-200 or X204-2TS are mounted on a vertical rail, an ambient temperature

of maximum +40 °C is permitted.

Note

The following applies to IE Switches X-200 that do not have IRT functionality:

The number of IE Switches X-200 connected in a line influences the frame delay.

When a frame passes through X-200 IE switches, it is delayed by the Store&Forward

function of the X-200 IE switch

 with a 64 byte frame length by approx. 10 microseconds (at 100 Mbps)

 with a 1500 byte frame length by approx. 130 microseconds (at 100 Mbps)

This means that the more IE Switch X-200 devices the frame passes through, the longer the

frame delay.

Note

The following applies to X-200 IE switches that have IRT functionality:

The number of IE Switches X-200 connected in a line influences the frame delay. The more

X-200IRT IE switches a frame runs through, the higher the frame delay.

By using the "cut through" switching mechanism, the X-200IRT IE switches are ideal to meet

the real-time requirements of PROFINET.

Cut through is not possible

 between a port set to 10 Mbps and a port set to 100 Mbps

 when two packets are to be sent at the same time on one port.

In this case, an IE Switch X-200 changes to Store&Forward and the delay increases.

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Siemens Industrial Ethernet Switches SCALANCE X-200 User Manual Page 283