Maximum Overall Cable Runs Of I-Bus; The External Marker Loop (I-Mark 3 Only) - IDENTEC SOLUTIONS i-MARK 2 Installation And Hardware Manual

7.2.7

Maximum Overall Cable Runs of i-BUS

There are 2 general limitations on the length of the i-BUS cabling:
 The overall length of the i-BUS over all units on the BUS must not exceed 1000 m (3000 ft)
 The distance from one unit to the next on the i-BUS must not exceed 300 m (1000 ft)
Mixed operation of i-MARKs and i-PORTs on one i-BUS
While i-PORTs can potentially be supplied over the i-BUS, the i-MARK's power consumption is too
high. So every i-MARK2/3 needs to have a local power supply.
So with i-PORTs powered via the i-BUS, the voltage drop over the wiring also needs to be taken into
account. The following table gives a recommendation of the overall length of an i-BUS with i-PORTs
powered over the i-BUS.
This table is valid for Cat5 cabling with gauge diameters of AWG24. The maximum distance between
any two units (i-MARK types and i-PORT types) is limited to 300 m (approx. 1000 ft).
# of i-PORTs Length (m/ft)
1 300/1000
2 600/2000
3 400/1300
4 250/820
5 200/650
8 100/300
8 1000/3000
7.2.8

The External Marker Loop (i-MARK 3 only)

i-MARK 3
In the US:
Place 2 ferrite rings around every cable of the
marker loop. The ferrite rings should be as close
as possible to the housing of the i-MARK.
Ferrite rings are included in the delivery of an i-MARK 3.
VISIBILITY DELIVERED.
i-MARK 2 / i-MARK 3
USER MANUAL
Remark
One 24V
One 24V
One 24V
One 24V
One 24V
One 24V
GND potential free power supplies at every i-PORT M
Marker Loop
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