Austdac TYPE SILBUS-A2WCCT2 Panduan Pengguna - Halaman 8
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Halaman Cetak5.3 SECONDARY SILBUS NETWORK PORT
The secondary SILBUS network port provides a means for the repeater to be connected to
the secondary SILBUS network. Any connections to a SILBUS field bus network pair should
be of a multi-drop nature with spur lengths kept to a minimum. This will minimize any
reflections and therefore communications errors in the SILBUS network.
TERMINAL
1
2
Table 3 Secondary SILBUS network port termination details
The table above shows the secondary SILBUS network port connections.
6 CERTIFICATION
The repeater type SILBUS-A2WCCT2 has been awarded IECEx certification under IECEx
TSA 07.0002X, Ex ia I, as part of the Dupline / SILBUS system.
The certification requires that the A2WCCT2 be mounted within a host enclosure that
provides a minimum ingress protection of IP54 (IP55 for Queensland Australia).
Because of the segregation and isolation between the various ports of the SILBUS-
A2WCCT2 it may be used to provide isolation and segregation between non-intrinsically
safe and intrinsically safe SILBUS networks without the use of signal draining zener
barriers. As shown in the above figure the primary network port is isolated from the power
supply and secondary network ports to IEC60079-11 375 volts as indicated by the green
dotted lines. The power port and secondary network are not isolated from each other.
S
S
I
I
L
L
B
B
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U
S
S
R
R
E
E
P
P
E
E
A
A
T
T
E
E
R
R
T
T
Y
Y
P
P
E
E SILBUS-A2WCCT2
U
U
S
S
SECONDARY SILBUS NETWORK PORT TERMINATIONS
DESIGNATION
SIG
COM
SECONDARY NETWORK
1
2
SIG COM
REPEAT ER T YPE A2WCCT 2
SIG COM
16 17
PRIMARY NETWORK
Figure 5 Repeater segregation and isolation levels
E
E
R
R
'
'
S
S
M
M
A
A
N
N
U
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A
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DESCRIPTION
SILBUS NETWORK SIGNAL
SILBUS NETWORK COMMON
14 15
+VE -VE
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8
O
O
F
F
1
1
0
0
120-321-12
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u
u
e
e
:
:
0
0
1
1