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The 8115-DO-DC is a high-density, DC output module manufactured by GE Industrial Solutions (now part of Emerson), designed for integration within their versatile and robust RX3i PACSystem programmable automation controller platform. This module serves as a critical interface, providing the necessary switching capability to control a wide array of DC field devices directly from the safety logic solver. The primary function of the GE 8115-DO-DC is to translate low-voltage logic commands from the central processor into isolated, high-power switching signals to actuate devices such as solenoid valves, motor starters, contactors, alarms, and indicator lamps within a safety instrumented system (SIS) or critical control application. It acts as the executive limb of the control system, executing the commands determined by the controller’s logic to initiate safety shutdowns or process actions.
Engineered for reliability in demanding industrial environments, the GE 8115-DO-DC delivers significant value by offering a high channel count in a single module, which optimizes rack space and reduces the overall hardware footprint of the control system. Its design emphasizes signal integrity and isolation, ensuring that inductive kickback from DC loads does not interfere with the sensitive backplane electronics of the RX3i controller. The intrinsic value of the GE 8115-DO-DC lies in its robust construction and high Mean Time Between Failure (MTBF) rating, which contributes directly to enhanced system availability, reduced maintenance costs, and the dependable execution of critical control functions that protect people, assets, and processes.
8115-DO-DC GE
Technical Specifications
| Parameter Name | Parameter Value |
| Product Model | 8115-DO-DC |
| Manufacturer | GE Industrial Solutions (Emerson) |
| Product Type | Digital DC Output Module |
| Compatible System | GE RX3i PACSystem |
| Number of Channels | 16 (Typically) |
| Output Type | Sourcing (Positive logic) or Sinking (Negative logic), depending on configuration |
| Output Voltage Range | 10-60 VDC |
| Maximum Continuous Current per Channel | 0.5 A |
| Point per Common | Typically 4 or 8 points per common (model specific) |
| Isolation | Channel-to-channel and channel-to-backplane isolation |
| On-state Voltage Drop | < 2> |
| Response Time | < 1> |
| Backplane Current Load | 80 mA @ 5V DC (Typical) |
| Operating Temperature | -40°C to +70°C (-40°F to +158°F) |
Main Features and Advantages
The GE 8115-DO-DC is distinguished by its high density and robust output protection. A primary feature is its 16-channel design, which allows for controlling numerous field devices from a single module slot, thereby maximizing I/O capacity and minimizing the size and cost of the overall control system. Each output channel is typically equipped with advanced protection features such as short-circuit protection, overload protection, and inductive load suppression (often through flyback diodes or other transient voltage suppression circuits). This built-in protection safeguards both the module itself and the field wiring from damage due to fault conditions, drastically improving system reliability and reducing downtime.
Ease of maintenance and diagnostics are key advantages of this module. It features prominent LED status indicators for each channel, providing immediate visual feedback on the state (On/Off) and health of each output, which is invaluable for rapid troubleshooting during commissioning or operational issues. The module is designed for hot-swap capability in supported systems, allowing for replacement without the need to power down the entire controller, a critical feature for maintaining continuous process operation. The GE 8115-DO-DC is designed for seamless integration with the RX3i platform, automatically identified and configured by the control engineering software (Proficy Machine Edition), which streamlines system setup and reduces programming effort.
Application Field
The GE 8115-DO-DC is deployed across a wide spectrum of industries for critical control and safety-related functions. In automotive manufacturing, it controls the solenoid valves of robotic welding cells, activates clamping cylinders in assembly fixtures, and operates conveyor line diverters. For material handling and packaging automation, this module commands the actuators for sortation arms, controls the release mechanisms on palletizers, and operates valves on pneumatic conveying systems.
Furthermore, this output module is essential in water and wastewater treatment plants for automating valve control in filtration and chemical dosing systems, and for starting/stopping auxiliary pumps. In the oil and gas sector, the GE 8115-DO-DC can be found in safety instrumented systems (SIS) to initiate partial shutdowns by de-energizing critical valves. Its robust design makes it suitable for harsh environments where reliable switching of DC loads is required for process control, machine automation, and safety interlocks, ensuring precise execution of control commands that drive industrial operations.
8115-DO-DC GE
Related Products
IC693MDL645: A comparable 16-point DC output module from GE’s older 90-30 series, showcasing the product lineage.
8116-DO-DC: A potential variant with a different current rating or point-per-common configuration within the same series.
8114-DI-DC: A 16-point DC input module, representing the complementary input counterpart to the 8115-DO-DC output module.
RX3i CPU Modules: The central processing units (e.g., CPE305, CPE330) that the 8115-DO-DC module serves within the PACSystem.
RX3i Power Supply: The system power supply (e.g., IC693PWR321) that provides regulated power to the backplane and modules.
Proficy Machine Edition: The engineering software suite used to configure, program, and diagnose the RX3i system and its I/O modules, including the 8115-DO-DC.
