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Key Technical Specifications
| Parameter | Value / Specification |
| Catalog Number | 1769-OF8C |
| Number of Outputs | 8 single-ended current channels |
| Output Ranges (Current) | 0 to 20 mA, 4 to 20 mA |
| Digital-to-Analog Resolution | 16 bits (unipolar) |
| Full-Scale Range Accuracy | ±0.35% at 25°C |
| Conversion Response Time | < 5 ms (to 95% of full scale across all active channels) |
| Backplane Current Draw | 145 mA @ 5.1V DC, 160 mA @ 24V DC |
| Power Dissipation | 4.58 W |
| Bus Power Supply Distance | 5 modules (must be installed within 5 slots of a 1769 power supply) |
| Isolation Voltage | 500V AC continuous, channels-to-backplane (no channel-to-channel isolation) |
| Removable Terminal Block | 1769-RTBN18 (18-point finger-safe screw terminal block) |
| Operating Temperature | 0 to 60°C (32 to 140°F) |
Product Introduction & Supply Chain Strategy
This product is a Brand New Surplus unit. It is not used, not pulled from a decommissioned plant, and not refurbished. All modules undergo rigorous quality verification to ensure OEM-level reliability. The Allen-Bradley 1769-OF8C is a high-density, 8-channel current output card tailored for CompactLogix and MicroLogix 1500 controllers. It is specifically optimized for applications demanding high-channel-count current control—such as multi-pump sequencing, chemical dosing skids, and HVAC damper positioning—without wasting backplane slots.
Procuring this module as New Surplus offers vital risk reduction for continuous process operations. Refurbished 8-channel analog output cards frequently exhibit thermal stress on internal Digital-to-Analog Converters (DACs) and age-degraded operational amplifiers. On high-density current modules like the 1769-OF8C, component degradation leads to output signal drift, high-channel thermal crosstalk, or complete output clamp conditions during thermal cycles. Installing factory-fresh New Surplus hardware ensures pristine 16-bit DAC linearity, uncompromised loop precision, and optimal Total Cost of Ownership by preventing off-spec production runs.
1769-OF8C
1769-OF8C
Installation & Configuration Guide
1.Pre-Installation (Prep & Safety):Safety warning: De-energize backplane power and external loop power before terminal removal.
Isolate main AC/DC backplane power and external 24V DC field loop supplies using strict Lock-Out/Tag-Out (LOTO) procedures. Wear a grounded anti-static wrist strap. Photograph or tag the 18-point Removable Terminal Block (RTB) wiring harness to maintain channel polarity during replacement.
2.Removal:
Unlatch the top and bottom RTB retaining clips and carefully pull the terminal block straight forward from the 1769-OF8C housing. Slide the bus locking levers on the top and bottom of adjacent modules open to disengage backplane contacts. Pull the module straight forward off the 35 mm DIN rail.
3.Installation (Clone & Seat):
Unpack the New Surplus 1769-OF8C module in an ESD-protected workspace. Align the rear tracking notch with the 35 mm DIN rail, push flush against the adjacent left module, and snap both top and bottom bus levers closed to lock backplane pins. Reattach the RTB wiring harness firmly until both retaining clips click.
4.Power-On & Testing:
Restore backplane and field power. Confirm that the OK LED illuminates solid green, indicating proper backplane initialization. In Studio 5000 / RSLogix 5000, confirm the channel configuration settings (0–20 mA vs 4–20 mA), force a 50% scale current output (12 mA on 4–20 mA range), and verify actual loop current at the terminal pins using a calibrated meter.
Firmware/Software Versions & Upgrade Notes
- Software Support: Programmed using RSLogix 5000 / Studio 5000 (CompactLogix) or RSLogix 500 (MicroLogix 1500).
- Channel Configuration: Signal range parameters (0–20 mA vs 4–20 mA) and fault-state hold settings (Hold Last State, Go to High Limit, Go to Low Limit) are configured per channel within the module properties tree during project setup.
- Power Supply Distance Rating: The 1769-OF8C has a Power Supply Distance Rating of 5. It must be placed within 5 slots of a system power supply (e.g., 1769-PA2, 1769-PA4, 1769-PB2, 1769-PB4) to satisfy backplane 24V DC current demands.
Frequently Asked Questions (FAQ)
What is the primary difference between the 1769- and the 1769-OF8V?
The is a current-only output module (supporting 0–20 mA and 4–20 mA ranges), whereas the 1769-OF8V is a voltage-only output module (supporting ±10V, 0–10V, 0–5V, and 1–5V DC ranges). Choose the 1769- when driving 4–20 mA current loops over long field distances.
Why choose New Surplus over a refurbished 1769- card?
High-density analog cards generate more internal heat than lower-density 2-channel or 4-channel cards. In refurbished modules, age and heat cycle stress degrade the onboard DC-to-DC converters and signal conditioning transceivers, causing channel calibration drift or erratic signal noise. New Surplus guarantees factory-calibrated accuracy across all 8 channels, zero operational hours, and full operating life.
Are these 1769- modules genuine Allen-Bradley products?
Yes. We strictly guarantee that every 1769- module supplied is 100% Original OEM New Surplus. Sourced from audited distributor excess, OEM machine builder reserves, and verified project inventories, each module undergoes visual, backplane handshake, and full 8-channel loop calibration bench testing prior to shipment.
Does the 1769- provide channel-to-channel isolation?
No. The 1769- provides 500V AC optical isolation between the field-side analog circuitry and the 1769 backplane bus, but all 8 current output channels share a common return signal path. If individual channel isolation is required for grounded field loops, consider isolated analog options or loop isolator signal conditioners.
What warranty is included with this New Surplus module?
All New Surplus 1769- modules are backed by our full 1-year replacement warranty. If any channel fails or any functional hardware defect occurs within 12 months under standard operating conditions, we will replace the module immediately directly from our stock.
