Description
Emerson KJ3242X1-BK1 12P4711X042 | DeltaV S-Series H1 Fieldbus Card | FOUNDATION Fieldbus Interface
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | KJ3242X1-BK1 |
| Alternate Part Number | 12P4711X042 |
| Manufacturer | Emerson |
| System | DeltaV S-Series |
| Product Type | H1 Fieldbus Card |
| Communication | FOUNDATION Fieldbus H1 |
| Fieldbus Channels | 2 H1 ports |
| Local Bus Power | 12 VDC, 300 mA |
| Fieldbus Power | 9–32 VDC, 12 mA per port |
| Operating Temperature | -40°C to +70°C |
| Relative Humidity | 5–95%, non-condensing |
| Shock | 10 g, ½-sine, 11 ms |
| Vibration | 1 mm peak-to-peak from 2–13.2 Hz; 0.7 g from 13.2–150 Hz |
| Airborne Contaminants | ISA-S71.04-1985 Class G3 |
| Hazardous Area Approvals | Includes ATEX, IECEx, and North American hazardous-location approvals for specified installations |
Emerson’s installation documentation specifies the as an S-Series H1 Card, with 12 VDC local-bus consumption of 300 mA and 9–32 VDC fieldbus power at 12 mA per port. The same document specifies an ambient range of -40°C to +70°C and hazardous-area certifications for applicable installations.
Product Introduction
Emerson 12P4711X042 H1 Fieldbus Card
The Emerson 12P4711X042 is a FOUNDATION Fieldbus H1 interface card designed for the DeltaV S-Series distributed control system. It provides two H1 fieldbus interfaces through which DeltaV can communicate with compatible intelligent field instruments such as transmitters, valve positioners, and other FOUNDATION Fieldbus devices. Emerson’s current S-Series hardware reference lists specifically as the Fieldbus H1 card.
For an installed DeltaV system, the is valuable because it maintains the existing S-Series fieldbus architecture without converting an H1 segment to another communication technology. Its documented power and environmental characteristics also make it suitable for specified industrial and hazardous-location installations. The fieldbus segment design, device count, power conditioner arrangement, and terminal-block configuration should still be checked against the actual DeltaV system before replacement.
KJ3242X1-BK1 12P4711X042
Application Scenarios & Field Pitfalls — The Engineer’s Perspective
Engineering Pain Point
When an H1 segment starts generating intermittent communication alarms, the card is often blamed first. In practice, the fault may be in the segment power supply, terminators, trunk wiring, spur connections, field-device configuration, or excessive segment loading. Replacing the without checking the complete H1 segment can waste valuable shutdown time.
Typical Applications
- DeltaV Process Control: Connecting FOUNDATION Fieldbus instruments directly to a DeltaV S-Series architecture.
- Oil & Gas: H1-based pressure, temperature, flow, and valve instrumentation.
- Chemical and Petrochemical Plants: Digital instrument communication and device diagnostics.
- Power and Utility Processes: FOUNDATION Fieldbus instrumentation within established DeltaV installations.
Technical Pitfalls to Avoid
- Do not confuse with KJ3241X1-BK1.
Emerson’s S-Series product table identifies KJ3241X1-BK1 as the Serial card, while is the H1 Fieldbus card. - Do not confuse it with the H1 card having integrated power.
Emerson separately identifies KJ3246X1-BA1 as an H1 card with integrated power. should therefore be matched with the correct S-Series terminal and segment-power architecture rather than substituted by model-family similarity alone. - Check the terminal-block keying.
Emerson specifies a rotary keying system so that the terminal block is matched to the appropriate I/O card. The documented installation uses terminal-block key position D6. - Do not hot-insert this card under energized field power.
Emerson’s hazardous-area installation instructions explicitly state that field power must be removed before connecting or removing the device and that the unit cannot be inserted or removed with system power energized. - Verify the H1 segment power arrangement.
The card’s documented fieldbus power specification is 9–32 VDC at 12 mA per port. This should not be interpreted as permission to ignore the segment power conditioner, current budget, cable length, terminators, or device loading. - Be careful with hazardous-area replacement.
The has multiple hazardous-location approvals, but the approval applies only under the specified installation conditions. For Zone 2 or Class I applications, verify the exact installation method and associated field-energy assessment before replacement.
Related Products
- Emerson KJ3241X1-BK1 — DeltaV S-Series Serial card; used for serial communications rather than FOUNDATION Fieldbus H1.
- Emerson KJ3243X1-BK1 — S-Series PROFIBUS DP card; a different fieldbus technology and not a direct H1 substitute.
- Emerson KJ3244X1-BK1 — S-Series DeviceNet card; used for DeviceNet communications.
- Emerson KJ3245X1-BK1 — S-Series AS-Interface card; intended for AS-Interface networks.
- Emerson KJ3246X1-BA1 — H1 card with integrated power; different power architecture from the .
- Emerson KJ3246X1-CA1 — Simplex H1 interface with integrated-power terminal block.
- Emerson KJ3246X1-DA1 — Redundant H1 interface with integrated-power terminal block.
- Emerson KJ4006X1-BA1 — H1 terminal block associated with DeltaV S-Series fieldbus hardware.
- Emerson KJ4005X1-BA1 — Power/controller carrier used within the S-Series architecture.
- Emerson DeltaV S-Series — Host I/O architecture for the H1 interface card.
Procurement note: The exact equivalence is . When sourcing a replacement, verify the card’s full part number, terminal-block keying, DeltaV hardware generation, and H1 segment power arrangement. Do not rely on descriptions calling this part a serial card, temperature controller, or PROFIBUS module; those classifications conflict with Emerson’s S-Series hardware documentation.
