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PLC and DCS Universal Analog Input Using Either 4-Pin or 6-Pin Terminal Block (cn0325)

The circuit shown in Figure 1 provides two, 16-bit, fully isolated, universal analog input channels suitable for programmable logic controllers (PLCs) and distributed control system (DCS) modules. Both channels are software programmable and support a number of voltage, current ranges, thermocouple, and RTD types, as shown in Figure 1.

Figure 1. Universal Analog Input Overview

The evaluation board contains two different fully isolated universal input channels, one with a 4-pin terminal block (CH2), and one with a 6-pin terminal block (CH1).

For the 4-terminal block channel (CH2), the voltage, current, thermocouple, and RTD inputs all share the same 4 terminals, thus minimizing the number of terminal pins required. For the 6-pin terminal block channel (CH1), the voltage and current inputs share a set of 3 terminals, and the thermocouple and RTD inputs share another set of 3 terminals; this configuration requires more terminals but has a lower part count and component cost. Figure 2 shows a photo of the printed circuit board (PCB), and Figure 3 shows a more detailed schematic of the circuit.

Figure 2. Universal Analog Input Board


Figure 3. Functional Block Diagram (Simplified Schematic: All Connections and Decoupling Not Shown)

Возможности

  • PLC/DCS universal input module
  • 4-pin or 6-pin terminal block
  • Fully isolated
  • 16-bit sigma-delta ADC

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PLC and DCS Universal Analog Input Using Either 4-Pin or 6-Pin Terminal Block  cn0325

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