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System Bus Connection,
What materials are
needed?
System Bus
Connection
System Bus Cable
Extension
Figure 4-10
System Bus Plug
Layout
(Seen from pin side of
cable plug)
42/24-10 EN Rev. 9
continued
The required system bus cables, tees and terminating resistors are supplied per
the order.
CAUTION!
For system bus connections use only the yellow system bus cables, tees and
terminating resistors. Do not use the violet connectors as they are only for
Modbus connections.
The modules should never be interconnected without using tees and termi-
nating resistors.
Step
Action
1
Place a tee on the system bus connection (designated "BUS") of each
module (electronics and analyzer).
2
Connect the tees with the system bus cables.
3
Place a terminating resistor on the open ends of each tee.
Note the following information if using other than the standard system bus cables
and plugs to extend the system bus:
• For extension purposes a shielded 4-conductor cable with twisted pairs and a
wire section ≥ 0.5 mm
Number and section of conductors
Inductance
Impedance
Coupling (1 kHz)
Operating capacitance
• For EMC purposes route the system bus cable via metal connection boxes with
metallic cable threaded connections. Connect the shield to the threaded con-
nections. Connect the unused wires in the 4-conductor extension cable in the
connection box to a PE clamp.
• Figure 4-10 shows the pin layout of the 3-pin system bus plug.
1
3
2
Chapter 4: Electrical Connection
2
should be used.
2 x 2 x 0.25 mm
approx. 0.67 mH / km
approx. 80 Ω
approx. 300 pF / 100 m
Conductor–Conductor approx. 120 nF / km
Conductor–Shield
Pin Wire Color
1
green
2
brown
3
white
2
approx. 160 nF / km
Signal
System Bus LOW
System Bus HIGH
System Bus GROUND
Continued on next page
4-11
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