
6-9
Cabling and Wiring the System
SIMATIC 545/555/575 System Manual
• Drop lines should be no longer than 33 feet (10 m).
• Short drop lines of 3.3 feet (1 m) do not measurably affect signal quality
and do not have to be counted for the length reduction shown in
Table 6-2.
The maximum permissible trunk length depends on the cable type used and
the number of terminal blocks in your installation. See Table 6-2.
Table 6-2 Maximum Cable Length for Trunk Lines
Number of
Maximum Distance in Feet (Meters)*
of Belden Cables
Terminal Blocks
9860 cable 9271 cable 9182 cable
2 – 5 3300 (1006) 1100 (335) 2200 (670)
6 3200 (975) 1067 (325) 2133 (650)
7 3100 (945) 1033 (315) 2067 (630)
8 3000 (914) 1000 (305) 2000 (610)
9 2900 (884) 967 (295) 1933 (589)
10 2800 (853) 933 (284) 1867 (569)
11 2700 (823) 900 (274) 1800 (548)
12 2600 (792) 867 (264) 1733 (528)
13 2500 (762) 833 (254) 1667 (508)
14 2400 (732) 800 (244) 1600(488)
15 2300 (701) 767 (234) 1533 (467)
16 2200 (671) 733 (223) 1467 (447)
17 2100 (640) 700 (213) 1400 (427)
*Figures in parentheses indicate distance in meters.
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