Figure 6-5: Ex-ia interfacing between SAM42 and DCS
A. Hazardous area
B. Safe area
C. Acoustic Particle Monitor
D. Ex i cable
E. Modbus RTU RS485 and Power
F. Safety barrier
G. Serial cable
H. 24 Vdc
I. Distributed Control System (DCS)
6.1.3 Interface to a fieldwatch server
The Rosemount SAM42 device can also be connected to a
permanent server with Fieldwatch software. The server handles all
communication with the SAM42 device. With a permanent server
connected to the SAM42 device, the server can act as one single
Modbus slave against DCS/PCS. With this software option, the
PCS/DCS can address all SAM42 devices connected to the system
via two Modbus calls, one for writing the flow velocity, and one
for reading sand rates and alarm status. The hard drive on the
server can also be used for trend data storage. Digital interface is
represented in the Figure 6-6 and Figure 6-7.
Quick Start Guide May2024
64 Emerson.com/Rosemount
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