09 47 900 0001 HARTING, 09 47 900 0001 Datasheet - Page 68

• Manufacturer Part Number: 09 47 900 0001
• Description: Ha-Vis Smart Patch Cable Detector
• Manufacturer: HARTING

Specifications of 09 47 900 0001

• Rohs Compliant: Yes

68
Fast Track Switching
Introduction
Fast Track Switching
Automation IT
connecting all applications, the uniform platform network increases the efficiency of company workflows.
Automation IT
and also in the field.
The currently available switching technology used in IEEE 802 .3 Ethernet, however, does not offer the level of
determinism required for automation applications . That is why automation solutions that only implement standard
(unchanged) Ethernet require a restricted network design in order to match automation performance levels . Thus
there are limited options for the network topology or segmentation – to the extent that IT communications are not
allowed within the automation environment .
Automation requires for Industrial Ethernet:
Standard Ethernet switching is based on store-and-forward switching and this introduces long latency times for the
frames. But even more serious is the tight dependency on the degree of network traffic: if only automation frames
are present in the network, then these frames can be transmitted with no problems. But additional data traffic on
the network will compete with the automation frames for forwarding and can thus delay these frames .
Standard switching uses the QoS (Quality of Service) option to influence this. If multiple frames are located in
the switch queue, then the frames with the highest priority are forwarded first. But it is still possible for other data
frames with priorities equal to or greater than the automation frames to be present . And even when the automation
frame has the highest priority, if a data frame is in the process of being sent, the next automation frame must wait
until 1522 bytes have been completely sent . Only then is the path open for the automation frame . The same delay
could then happen on the next network switch once more . So these wait delays can quickly add up to times which
are critical for automation applications . This behaviour can be seen as stochastically random . Most of the time the
transfer times will be sufficient. But it only takes one delayed frame to trigger a problem.
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is a communication platform that serves all applications within an industrial manufacturing firm. By
supports Standard Ethernet at all levels – including the office, management and control levels,
top performance
safety
flexible topology
and above all determinism