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Masoneilan SVI II ESD Quick Start Guide
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SVI II ESD Configurations
There are three possible SVI II ESD installation configurations each with a different wiring
scheme.
Analog Safety Demand (ASD)
Discrete Safety Demand (DSD)
Analog with Discrete Safety Demand (A/DSD)
Analog Safety Demand (ASD)
The Analog Safety Demand configuration is: 4 - 20 mA signal, power and trip signal with super-
imposed HART
®
communications (Figure 12).
Figure 12 Analog Safety Demand (ASD) Configuration
Discrete Safety Demand (DSD)
The Discrete Safety Demand configuration is: 24 VDC, power and trip signal with superimposed
HART
®
communications (Figure 13).
.
Figure 13 Discrete Safety Demand (DSD) Configuration
SVI II ESD
4 - 20 mA + HART
2 Wire Solution - Safety Function Triggered by Current Sensing (5.6 mA = Safety Trip)
Control System
or
Safety System
AO
SVI II ESD
24 VDC + HART
Safety Function Triggered by Discrete 0 - 24 VDC Signal (3 VDC = Safety Trip)
Control System
or
Safety System
DO
High Impedance
Device Required
for HART Signaling
