Siemens SIMATIC NET Betriebsanleitung PDF herunterladen (Seite 38)

100

101

Configuring Networks

3-12

SIMATIC NET Twisted-Pair and Fiber-Optic Networks

C79000-G8976-C125-02

Sample Calculation (cascading limits)

Number of OLMs Path Variability Value of

Node 1 to Node 2

Total PVV

2 6 BT + 6 BT 12 BT

4 6 BT + 2 * 3 BT + 6 BT 18 BT

8 6 BT + 6 * 3 BT + 6 BT 30 BT

11 6 BT + 9 * 3 BT + 6 BT 39 BT

12 6 BT + 10 * 3 BT + 6 BT 42 BT > 40 BT !!

Number of OLMs Delay Equivalent from

Node 1 to Node 2

Remaining Cable Length

2 140 m + 2 * 360 m + 140 m 3520 m

4 140 m + 360 m + 2 * 260 m + 360 m + 140 m 3000 m

8 140 m + 360 m + 6 * 260 m + 360 m + 140 m 1960 m

11 140 m + 360 m + 9 * 260 m + 360 m + 140 m 1180 m

Notes:

S If a DTE is connected via the integrated TP port, this attachment must be

included in the length calculation as a delay equivalent of 140 m and a PVV of

S Each further network component increases the PVV and reduces the remaining

cable length.

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