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7.3 INSTALLATION CONFIGURATION 3
SW1
CH 1
18
CH 2
19
20
+VS2
CH 3
21
22
CH 4
23
Q1
-VS2
COMMON
-VS1
SIG 1
COM 2
HAZARDOUS AREA SIGNAL
17
SAFE AREA
16
4 CHANNEL DIGITAL
TRANSMITTER TYPE SILBUS-TX4D
+VS1
SILBUS NETWORK
This configuration allows the four channel digital transmitter to be located wholly within the
safe area, the connection of an intrinsically safe SILBUS network, be powered from a
intrinsically safe power supply and the connection of non-intrinsically safe digital inputs.
This configuration is possible because of the segregation and isolation between the digital
inputs and the remainder of the transmitter.
+VS3
+VE 14
-VE 15
-VS3
Figure 5 Installation configuration 3
This configuration allows an intrinsically safe SILBUS network to be interfaced with nonintrinsically safe digital inputs and the transmitter to be powered from an intrinsically safe
source. This is particularly useful in the monitoring of safe area circuits by an intrinsically
safe SILBUS network.
Obviously the segregation of the intrinsically safe SILBUS network and power port wiring
are of paramount importance in this configuration. Incorrectly segregated SILBUS network
and power wiring could negate the segregation and safety of the transmitter and the entire
SILBUS network installation.
PARAMETER
Ui
Ii
Li
Ci
Uo
Io
Lo
Co
Lo/Ro
Um
Un
INSTALLATION CONFIGURATION 3 ENTITY PARAMETERS
DIGITAL
POWER
SILBUS
DESCRIPTION
INPUTS
PORT
PORT
Max input voltage
12.6 volts
12.6 volts
Max input current
3.3 amps
3.3 amps
Input inductance
0uH
0uH
Input capacitance
0uF
0uF
Max output voltage
0 volts
0 volts
Max output current
Max load inductance
Max load capacitance
Max cable L/R
Maximum non I.S. voltage
250 volts
12.6
Nominal operating voltage 5 – 30 volts 7.5 – 12.6 v
Table 9 Installation configuration 3 entity parameters
4 CHANNEL DIGITAL TRANSMITTER
TYPE SILBUS-TX4D USER'S MANUAL
20 OF 22
CONSOLE
PORT
5.88 volts
-
120-228-12
Is s u e : 0 2