Product Details
Configured for discrete output signal conditioning and load switching in Emerson process control platforms, the Emerson 8115-DO-DC (8115-DO-DC Discrete Output Module) provides direct physical/electrical execution. It switches 2-60 VDC non-isolated load loops across 8 independent channels based on Railbus command signals.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 8115-DO-DC |
| Brand | Emerson |
| Product Type | Discrete Output Modules |
| Number of Channels | 8 Channels |
| Output Voltage Range | 2-60 VDC (Module Powered, Non-Isolated) |
| Continuous Switched Current | 1 A per channel |
| Peak Switched Current | 4 A (less than 100 ms), 6 A (less than 20 ms) |
| ON Voltage Drop | 0.25 V max |
| OFF Leakage Current | 1.0 mA max |
| Output Modes | Discrete, Momentary or Continuous Pulse |
| Pulse Width Range | 2 ms to 130 s |
| Response Time | 1 ms max (Railbus command to output change) |
| Power Consumption | 70 mA max (45 mA typ) at 12 VDC Railbus |
| Bussed Field Power | 2 to 60 VDC |
| Module Key Code | B6 |
| Module Width | 42 mm |
| Weight | 0.21 kg (0.21 kg net / 1.0 kg shipping) |
| Origin | USA |
| Operating Temp | -20 to 70 deg C |
4-20 mA HART Loop Protocol and Channel Isolation
The 8115-DO-DC operates on a shared bussed field power topology within the Emerson I/O node structure. While discrete outputs handle DC switching currents up to 1 A continuous per channel, internal shielding protects adjacent high-density 4-20 mA HART loop protocol signal paths on the common backplane from capacitive and inductive switching noise. Galvanic isolation between the internal 12 VDC Railbus logic circuit and the 2-60 VDC field power bus ensures backplane communication integrity during heavy load transients.
Frequently Asked Questions
Q: What is the maximum command-to-output latency for the 8115-DO-DC module?
A: The physical response time from receipt of a Railbus switching command to output change is 1 ms maximum.
Q: How does the 8115-DO-DC react if communications with the node processor fail?
A: The module transitions to a designated fail-safe state, holding either a predefined default state or retaining the last valid command value depending on configuration settings.
Q: Can the 8115-DO-DC handle inductive inrush currents from DC relay coils?
A: Yes. Each channel supports peak surge currents up to 4 A for durations under 100 ms, and up to 6 A for brief transients under 20 ms.
Field Installation Guidelines
- Mount the 42 mm module onto the compatible node carrier slot, ensuring the B6 mechanical key alignment matches the carrier base to prevent mis-insertion.
- Connect bussed field power lines within the 2-60 VDC operating window to supply external load loops.
- Terminate field load conductors securely to the module terminal block, ensuring current demands do not exceed 1 A continuous per channel.
- Verify that signal wiring shielding is tied directly to the cabinet functional earth bus bar to mitigate transient electrical noise.
- Maintain adequate ventilation spacing around the carrier assembly to dissipate thermal losses during high-density multi-channel current switching.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
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