Allen-Bradley 1734-OE4C – 4-Channel Analog Current Output Module | POINT I/O Platform
Engineering Background
The Allen-Bradley 1734-OE4C is part of Rockwell Automation’s POINT I/O modular distributed I/O platform, engineered for high-density, rail-mounted control architectures. Designed to interface directly with ControlLogix, CompactLogix, and SoftLogix controllers via the POINT I/O adapter, this module delivers precise 4–20 mA analog current output across four independent channels — the industry-standard signal range for process instrumentation and actuator control.
Product Positioning
The 1734-OE4C targets process engineers and system integrators who require compact, DIN-rail-mounted analog output capability within a distributed I/O node. Its channel-to-channel isolation, high resolution, and native EtherNet/IP or DeviceNet compatibility (via adapter) make it a preferred choice for chemical processing, water treatment, HVAC, and discrete manufacturing applications where loop-powered field devices demand stable, calibrated current signals.
Complete Technical Specifications
| Catalog Number | 1734-OE4C |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Platform | POINT I/O |
| Module Type | Analog Current Output |
| Number of Channels | 4 (single-ended) |
| Output Signal Range | 4–20 mA (standard); 0–21 mA (extended) |
| Resolution | 16-bit (0.3 µA per count) |
| Accuracy | ±0.1% of full scale at 25 °C |
| Maximum Load Resistance | 750 Ω at 24 VDC supply |
| Output Update Rate | Configurable via RPI (Requested Packet Interval) |
| Isolation | Channel-to-backplane: 100 VDC continuous |
| Supply Voltage | 24 VDC (18–32 VDC operating range) |
| Current Consumption | 65 mA from POINT I/O bus |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | -40 °C to +85 °C |
| Relative Humidity | 5–95% non-condensing |
| Mounting | DIN rail via POINT I/O base unit (1734-TB or 1734-TBS) |
| Dimensions (H × W × D) | 94 mm × 12 mm × 60 mm (approx.) |
| Weight | ~200 g |
| Certifications | UL, CE, C-Tick, ATEX (Zone 2 with 1734-AENTR adapter) |
| Communication | Via POINT I/O adapter (EtherNet/IP, DeviceNet, ControlNet, PROFIBUS) |
| Programming Environment | Studio 5000 Logix Designer / RSLogix 5000 |
Proven Application Environments
- Process Control: 4–20 mA loop control for control valves, variable-speed drives, and positioners in oil & gas and chemical plants.
- Water & Wastewater: Pump speed reference signals and dosing control in municipal treatment facilities.
- HVAC & Building Automation: Damper actuator and chiller setpoint control integrated with BAS via EtherNet/IP.
- Discrete Manufacturing: Tension control, web guiding, and conveyor speed regulation on production lines.
- Pharmaceutical & Food Processing: Precise flow and pressure setpoint delivery in hygienic process skids.
Engineering Advantages
- High Resolution: 16-bit DAC ensures smooth, artifact-free analog output — critical for PID loop stability.
- Compact Footprint: 12 mm wide module maximizes channel density on DIN rail, reducing panel real estate.
- Hot-Swap Capable: POINT I/O architecture supports module replacement under power without full system shutdown (adapter-dependent).
- Configurable Fault State: Each channel independently configurable to hold last value, go to zero, or go to a user-defined safe state on communication fault.
- Diagnostic Reporting: Open-wire detection and over-range/under-range alarms reported back to the controller via CIP data.
- Scalable Architecture: Mix analog and digital POINT I/O modules on the same adapter node — no dedicated analog rack required.
System Architecture & Signal Flow
The 1734-OE4C plugs into a POINT I/O base unit (1734-TB3 or 1734-TBS3) and communicates with the network adapter (e.g., 1734-AENT for EtherNet/IP) via the POINT I/O backplane bus. The controller sends output data via CIP I/O messaging at the configured RPI. The module’s internal 16-bit DAC converts the digital word to a precision current source, which drives the field loop through the terminal block wiring. Each channel sources current independently, allowing mixed-load configurations across the four outputs.
Typical Wiring: Each channel uses a 2-wire connection (I+ / I−) to the field device. The module sources current; the field device (valve positioner, VFD analog input, etc.) acts as the load. Maximum loop resistance is 750 Ω at 24 VDC supply.
Sourcing & Quality Verification
- All units sourced from authorized distributors or verified surplus channels with documented chain of custody.
- Each module undergoes incoming inspection: visual check, label verification (catalog number, series, firmware revision), and functional power-on test where applicable.
- Firmware revision and series letter confirmed against Rockwell Automation product compatibility matrix prior to shipment.
- Original Rockwell Automation packaging preserved where available; repackaged units clearly identified.
- Certificate of conformance available upon request for regulated industries.
Procurement Process
- Step 1 – Inquiry: Submit your BOM or part number via the order form or email support@konmask.com with quantity and required delivery date.
- Step 2 – Quote: Receive a formal quotation within 1 business day including unit price, lead time, and shipping options.
- Step 3 – Order Confirmation: Purchase order or online checkout accepted. Pro-forma invoice issued for wire transfer payments.
- Step 4 – Shipment: Modules shipped via DHL / FedEx / SF Express with full tracking. Export documentation (commercial invoice, packing list, COO) included.
- Step 5 – After-Sales: 12-month warranty on verified new units. Technical support available via email and phone for integration questions.
Technical FAQ
Q: Can the 1734-OE4C output 0–20 mA instead of 4–20 mA?
A: Yes. The module supports an extended range of 0–21 mA, configurable in Studio 5000 Logix Designer under the module properties output range setting.
Q: Which POINT I/O adapters are compatible?
A: The 1734-OE4C is compatible with all standard POINT I/O adapters including 1734-AENT (EtherNet/IP), 1734-ADN (DeviceNet), 1734-ACN (ControlNet), and 1734-APB (PROFIBUS DP).
Q: What happens to the outputs on a communication fault?
A: Each channel’s fault state is independently configurable: hold last state, ramp to zero, or go to a user-programmed value. This is set in the module configuration within Studio 5000.
Q: Is the module compatible with ControlLogix and CompactLogix?
A: Yes, via the appropriate POINT I/O adapter. The module is fully supported in Studio 5000 Logix Designer v21 and later with the corresponding Add-On Profile (AOP).
Q: What base unit (terminal block) does the 1734-OE4C require?
A: The module requires a 1734-TB3 (3-wire) or 1734-TBS3 (spring-clamp 3-wire) base unit. Ensure the correct base is ordered separately if not already installed on the DIN rail.
Q: Can I replace the module without powering down the system?
A: Hot-swap capability depends on the adapter used. The 1734-AENT and 1734-AENTR adapters support electronic keying and hot-swap; verify your adapter’s documentation before attempting live replacement.
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