Austdac TYPE SILBUS-A2WCCT2 Manuel de l'utilisateur - Page 6

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By using the repeater in conjunction with two sets of lightning surge protection diverters,
one on the primary network and one on the secondary network as shown in the figure
below the effects of lightning can be virtually eliminated from the intrinsically safe
secondary network.
For maximum reduction of lightning surges in the secondary network the two functional
earths must not be connected directly. Always use best practice high radio frequency
wiring techniques for the earth connections. Always maintain segregation and separation
of the wiring of the primary and secondary SILBUS networks.

3.3 REDUCTION OF REFLECTIONS INTRODUCED BY A LARGE BRANCH OR STUB

The repeater can be useful in eliminating the effects of reflections caused by the addition
of a long branch, spur or stub to a SILBUS network. By using a repeater as shown in the
figure below the effects of stub generated reflections can be eliminated entirely.
SILBUS NETWORK
LONG STUB OR BRANCH THAT WILL CAUSE
REFLECTIONS AND IMPACT ON SYSTEM STABILITY

Figure 3 Eliminating reflections caused by a network branch

The repeater isolates the discontinuity effects of a stub, spur or branch from the primary
network.

4 OPERATING INSTRUCTIONS

The repeater type SILBUS-A2WCCT2 does not require any operator action to operate once
it has been installed within an IP54 host enclosure and wired correctly.
The repeater introduces a delay of one Dupline / SILBUS scan when transferring channel
pulses from the secondary network to the primary network. The channel generator function
of the secondary network will lock onto and follow the channel generator function of the
primary SILBUS network causing channel pulses being transferred from the primary
network to the secondary network to incur a maximum delay of 1mS.
The secondary SILBUS network of the repeater will take on the same number of channels
(8, 16, 32, 64 or 128) as the primary SILBUS network
S
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L
B
B
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U
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R
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A
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R
R
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E SILBUS-A2WCCT2
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U
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PRIMARY SILBUS NETWORK
REPEATER
TYPE A2WCCT2
REPEATER PRESENTS NO STUB OR BRANCH TO PRIMARY
NETWORK REDUCING THE EFFECTS OF REFLECTIONS
6
6
O
O
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1
1
0
0
SECONDARY SILBUS NETWORK
IS NO LONGER A STUB OR BRANCH
120-321-12
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