Nivetec Echo Smart Series, Руководство по эксплуатации и установке

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8.1.4. Integrated Field Networks (Figure 8.4)
EchoSmart Controllers operating Field Networks may be interconnected in an
integrated two-wire RS-485 Network of up to 240 Smart Sensors. Each Controller
can maintain a network of up to sixteen sensors utilizing either wired connections
or the wireless radio modules. The Controllers can then be connected using a two-
wire twisted pair so that only one cable run has to be made to the control system.
Customer Modbus RTU integration is required.
IMPORTANT: The two-wire cable to the control system should not be connected
to the ESC until all sensors are installed and communicating with the local ESC.
Figure 8.4: Integrated Wired Field Network
8.2.
Outputs
Current measurements from each sensor can be accessed through a Modbus RTU
command request or an analog 4-20 mA current loop in addition to the measurement
displayed on the installed ESC.
ESP ESP*
ESC
1 2 16
–
ESP ESP*
ESC
RS485
to DCS
or SCADA
1 2 16
–
Customer
Integration
Field
Networks
*
The individual Field Networks should be wired as shown in
Figure 8.2 or utilize radios as in Figure 8.3.
ESC = Echo Smart Controller
ESP = Echo Smart Power Supply
RS-485 (J7)
1
3
+
–
S
RS-485 (J7)
1
3
*
S
+
–