Crevis – ST‑3218 - Rev 1.002 – 8‑Channel 4–20 mA Analog Input Module

The Crevis ST-3218 Rev 1.002 is an 8-channel analog input module (4–20 mA), part of the FnIO-S distributed I/O series, compatible with multiple fieldbus protocols via a host adapter. Featuring 12-bit resolution and a 4 ms total update rate, it delivers accurate current measurements for industrial control systems and RSTi-like architectures.

Key Features

• Model & Revision: ST‑3218 Rev 1.002 (Crevis P/N 311395, formerly Emerson ST‑3218)  

• Analog Inputs: 8 single-ended 4–20 mA channels; input impedance ~120 Ω

• Resolution & Speed: 12-bit (3.9 μA/bit), total conversion time 4 ms across all channels  

• Accuracy: ±0.1 % FS at 25 °C, ±0.3 % FS at 0–60 °C  

• Status Indicator: 1 bi-color (green/red) Fn-Bus state LED  

• Power Requirements:

  • Logic: 5 V DC, ~60 mA

  • Field: 24 V DC (18–28.8 V), ≤40 mA  

• Isolation: Photocoupler isolation between I/O and logic; field-power non-isolated  

• Mechanical: 12 × 99 × 70 mm, 70 g; pluggable into FnIO-S (or RSTi-type) rack with removable terminal block  

• Environmental: Standard industrial temperatures; wiring up to 2 mm² cables; shield tied to DIN-rail