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Lenze · E94AYCEO communication module (EtherNet/IP™) · Communication Manual · DMS 3.0 EN · 12/2013 · TD17 18

4Technical data

4.4 Internal switch latency

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4.4 Internal switch latency

The integrated 2-port switch causes runtime delays. For "store-and-forward" and 100 Mbps, these

runtime delays can be calculated as follows.

• Runtime delay for an output data packet of the scanners incl.

32-bit "Run/Idle header" with 16-

bit sequence counter:

• Runtime delay for an output data packet of an adapter without

32/bit "Run/Idle header":

Example

Delay of an output data packet of the scanners with 8 output data words (16 bytes):

• ((66 permanent bytes + 16 bytes) x 8 x 10 nsec) + 4 μsec

• (82 bytes x 8 x 10 nsec) + 4 μsec

• 6.56 μsec + 4 μsec = 10.56 μsec

Runtime delay = ((66 permanent bytes + I/O data in bytes) x 8 x 10 nsec) + 4 μsec

Runtime delay = ((62 permanent bytes + I/O data in bytes) x 8 x 10 nsec) + 4 μsec

 Note!

The use of external switches can also lead to runtime delays. Depending on the system

constellation, it may be useful to create a star topology or a line/mix topology.

Network topology

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