Application Scenarios
A food and beverage processor operated a filling line where washdown procedures were a daily necessity. Standard cabinet-mounted analog input modules required additional enclosures to survive the caustic cleaning agents and high-pressure spray, adding cost and creating condensation traps that caused intermittent faults. The maintenance team replaced the cabinet-based I/O with 1738-IE4CM12 modules mounted directly on the machine frame. The 1738-IE4CM12‘s sealed IP67 housing eliminated the need for protective enclosures entirely, while its M12 connectors maintained the integrity of the electrical connections through repeated washdown cycles. The line’s pressure and flow transmitter signals were acquired reliably without nuisance faults, and changeover time between product batches was reduced because the 1738-IE4CM12 could be swapped without opening a cabinet or disturbing adjacent wiring.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 1738-IE4CM12 |
| Manufacturer | Rockwell Automation (Allen-Bradley) |
| Product Category | Analog Input Module (ArmorPoint I/O) |
| Input Channels | 4 single-ended, non-isolated |
| Signal Range | 0–20 mA, 4–20 mA |
| Resolution | 16 bits over 0–21 mA (0.32 µA/count) |
| Accuracy | 0.1% Full Scale @ 25°C |
| Conversion Type | Sigma-Delta |
| Input Impedance | 60 Ω |
| Input Step Response | 50 ms @ 60 Hz notch (default) |
| Input Update Rate | 200 ms @ 60 Hz notch (default) |
| Data Output | 12 bytes produced (scanner Rx), no consumed data |
| Supply Voltage | 24V DC nominal (10–28.8V DC range) |
| PointBus Current | 75 mA @ 5V DC |
| Enclosure Rating | IP65/66/67/69K (when marked) |
| Dimensions | 71.6 × 33.1 × 111.6 mm |
| Weight | Approx. 0.2 kg |
| Connector Type | DC Micro (M12) |
| Operating Temperature | -20 to +60°C |
| Lifecycle Status | Discontinued (Dec 31, 2025) |
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