Spectrum Controls 1746sc-INI4vi - Manual (Page 11)

Overview And Specifications
The 1746sc-INI4i monitors up to 4 isolated analog current inputs, while
the 1746sc-INI4vi monitors up to 4 isolated analog current or voltage
inputs (selectable by channel). In both modules, you can select different
input ranges (for example, 4–20 mA or 1–5 Vdc) independently, by
channel, for optimal use of rack space.
Read this chapter to familiarize yourself further with your isolated analog
module. This chapter covers:
• general features and benefits
• detailed specifications
General Features And
Benefits
Increased Accuracy and Reliability
Both modules provide 750 Vdc channel-to-channel isolation, which
means no electrical crosstalk between channels (resulting in less noise
and a high effective resolution). They also provide 750 Vdc field wiring-
to-backplane isolation to protect your processor and other rack
components. And for state-of-the-art precision, they offer 16-bits of
resolution.
For added reliability, both modules perform a battery of diagnostic tests
at startup and can alert you to open input circuits through status bits and
LEDs. The open-circuit response state is selectable. Onboard over-
voltage and over-current protection also help prevent damage to the
module due to wiring errors.
Reduced System Costs
Because channel-to-channel isolation is built into these modules, they
eliminate the need for expensive, external analog isolation blocks and the
time and space required to install them. Both modules provide a single-
slot solution for applications requiring up to 4, mixed, analog inputs.
They also feature auto-calibration, so you never have to perform this
time-consuming task.
Chapter 1