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Description
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1738-IE4CM12 |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Type | Analog Current Input Module, 4 Single-Ended Channels |
| Product Series | ArmorPoint I/O, Bulletin 1738, Series A |
| Number of Inputs | 4, single-ended, non-isolated |
| Input Signal Range | 0–20 mA and 4–20 mA |
| Input Resolution | 16 bits over 0–21 mA, 0.32 µA per count |
| Absolute Accuracy | 0.1% full scale @ 25 °C |
| Accuracy Drift | 30 ppm/°C |
| Input Impedance | 60 Ω |
| Conversion Type | Sigma-Delta, signed integer data format |
| Input Step Response | 50 ms @ 60 Hz notch (default), 6.25–60 ms depending on notch setting |
| Digital Filter Time Constant | 0–10,000 ms, default 0 ms |
| Common Mode / Normal Mode Rejection | 120 dB CMRR, -60 dB NMRR |
| Connector Type | DC Micro (M12), 5-pin, metal coupling ring |
| Power Supply | 24V DC nominal, 10–28.8V DC range |
| External DC Supply Current | 15 mA @ 24V DC |
| POINTBus Current | 75 mA @ 5V DC |
| Power / Thermal Dissipation | 0.6 W maximum @ 28.8V DC / 2.0 BTU/hr maximum |
| Isolation Voltage | 50V continuous, reinforced insulation, tested 1250V AC for 60 s |
| Status Indication | 1 module status LED, 1 network status LED, 4 input status LEDs (green/red) |
| Enclosure Rating | IP65 / IP66 / IP67 / IP69K, sealed for washdown |
| Dimensions (H × W × D) | 71.6 × 33.1 × 111.6 mm (2.82 × 1.30 × 4.39 in.) |
| Weight | Approximately 290 g (10.2 oz) |
| Operating Temperature | -20 to +60 °C (-4 to +140 °F) |
| Storage Temperature | -40 to +85 °C (-40 to +185 °F) |
| Vibration / Shock | 5 g @ 10–500 Hz / 30 g operating, 50 g non-operating |
| EMC Immunity | 6 kV contact and 8 kV air ESD, ±3 kV EFT/B on signal ports |
| Certifications | CE, C-Tick, EN 61326, EN 61000-6-2/4, EN 61131-2 |
| Key Switch Position | 3 |
| Lifecycle Status | Discontinued as of December 31, 2025, no planned Rockwell Automation replacement |
Main Features and Advantages
Measurement precision that supports real process control: The Allen-Bradley 1738-IE4CM12 combines 16-bit resolution with 0.1% full-scale absolute accuracy and a drift of only 30 ppm/°C, so readings taken in a hot washdown bay remain trustworthy without periodic recalibration. A Sigma-Delta converter and a selectable notch filter covering 50, 60, 100, 120, 200, 240, 300, 400 and 480 Hz allow the module to be matched to the local mains frequency and to the electrical noise signature of the machine, while a digital filter time constant adjustable from 0 to 10,000 ms smooths turbulent signals such as flow or weighing inputs without external signal conditioners.Sealed construction for on-machine mounting: With an IP69K-rated housing and M12 metal-coupling connectors, the Allen-Bradley 1738-IE4CM12 withstands high-pressure, high-temperature washdown, airborne dust, oil mist and mechanical impact. Because no enclosure, glands or internal terminal wiring are required, installers save the cost of a stainless cabinet and the labour of running shielded analog cable back to a central marshalling panel, which is typically the largest hidden expense in an analog I/O project.Diagnostics that shorten fault finding: Each channel on the Allen-Bradley 1738-IE4CM12 has a dedicated green/red LED that reports input status and fault conditions, and module and network LEDs separate field-side problems from communication problems at a glance. Under-range and over-range behaviour is reported as signed integer data, so a broken transmitter loop or an open wire is visible in the controller logic rather than only as a suspicious process value.Simple engineering integration: Configured through Add-On Profiles in Studio 5000 Logix Designer, the Allen-Bradley 1738-IE4CM12 presents scaling, filter, notch and alarm parameters in a single configuration dialogue, and its low 75 mA POINTBus draw plus 0.6 W dissipation allow dense analog stations without oversizing the power budget.
