Product Core Brief
- Model: (cross PN: 12P4704X032, mates with KJ3221X1-BK1 front AO card)
- Brand: Emerson DeltaV
- Series: S-Series Traditional I/O Termination Infrastructure
- Core Function: Keyed field wiring terminal base built exclusively for 8-channel 4–20mA HART analog output front modules
- Product Type: Plug-in rack-mounted analog output wiring carrier, anti-loose screw-clamp field termination
- Key Specs: 8 AO circuit terminals | rotary mechanical key lock A4 | 0.5–2.5mm² wire capacity | HART signal pass-through routing
- Note: New original surplus unit; only compatible with S-series I/O carriers, zero mechanical fit for M-series rack hardware
Key Technical Specifications
| Parameter | Value |
|---|---|
| Supported Front Card | KJ3221X1-BK1 8-channel isolated HART analog output module |
| Field Termination Hardware | M3 anti-vibration screw clamp terminals |
| Acceptable Wire Gauge | 0.5–2.5 mm² solid or stranded copper wire |
| Mechanical Key Profile | Rotary lock Key Position A4, blocks non-AO card insertion |
| Signal Routing Design | Pass-through isolation routing matching front card 1000VDC channel isolation |
| HART Compatibility | Unfiltered transparent HART signal path for valve positioner diagnostics |
| Mounting Standard | DeltaV S-Series 35mm DIN rail I/O carrier racks |
| Hot-Swap Rules | Front AO card supports hot-swap; full rack power shutdown required for base removal |
| Operating Temperature | -40°C to +70°C operational; -40°C to +85°C storage |
| Environmental Grade | ISA S71.04 G3 corrosive gas resistant, full PCB conformal coating |
| Vibration & Shock Rating | 1mm pp (2–13.2Hz); 0.7g constant (13.2–150Hz); 10g half-sine 11ms shock |
| Physical Dimensions | 130mm W × 90mm H × 25mm D; net weight 0.31 kg |
| Hazardous Certifications | FM Class I Div2, ATEX Ex ec IIC Gc (Zone 2 cabinet mounting only) |
| Enclosure Rating | IP20, restricted to indoor control cabinet installation |
Product Introduction
This fixed wiring carrier serves as the field termination interface for 8-point HART analog output loops within DeltaV S-Series racks. It routes isolated 4–20mA drive signals to proportional valve positioners while maintaining unobstructed HART communication paths for AMS asset management data.Unique A4 rotary keying physically prevents accidental pairing with discrete input, discrete output or thermocouple front cards, eliminating backplane handshake faults during rushed field maintenance cycles. Screw-clamp terminals hold stable contact resistance under continuous cabinet vibration from cooling fans and large pump motor drives.
QA & Testing SOP
- Incoming Inspection: Cross-reference serial numbers against OEM factory batch logs; inspect backplane gold edge connectors for oxidation and plastic housing for cracked key lock tabs. Reject units with stripped terminal screw threads.
- Mechanical Mating Test: Insert matching KJ3221X1-BK1 front AO card 500 times to validate full key lock engagement and consistent low contact resistance across all signal pins.
- Continuity & HART Path Test: Use Fluke 115 multimeter to verify unbroken signal paths between each field terminal and backplane pins; confirm no capacitive filtering that would attenuate HART digital signaling.
- Key Incompatibility Check: Attempt insertion of DI/DO/TC front cards to confirm the A4 mechanical lock fully blocks seating of mismatched I/O hardware.
- Final QC & Packaging: Purge PCB traces with dry nitrogen to remove industrial particulate contamination; seal unit in static-shield bag with printed test report capturing mechanical mating cycle and continuity data.
Installation Pitfalls & Guide
❗ ESD Component Failure Risk: Ungrounded contact with backplane traces damages isolation routing circuits; full rack downtime labor costs exceed $2,500. Always attach a grounded anti-static wrist strap to cabinet safety ground before handling the base.❗ Zone 0/1 Hazardous Area Misapplication: The terminal base only holds Div2 safety certification. Deploying it in Zone 0 or Zone 1 flammable gas cabinets voids all safety approvals and creates ignition hazards.❗ M-Series Rack Cross-Installation: This hardware uses incompatible pinout and mechanical form factor with M-series carriers; forced insertion permanently bends rack backplane gold pins and disables LocalBus communication.❗ Improper Wire Torque: Under-tightened screw terminals loosen over vibration, triggering intermittent valve position drift; over-torquing strips threads and fractures copper wire strands.❗ Live Base Removal Prohibition: The base carries shared analog drive signal rails. Removing the unit while rack power stays energized cuts all 8 AO control signals simultaneously and triggers full process interlock trips.
4-Step Replacement Guide
- Pre-install: Execute full rack lockout/tagout and shut down rack power supply; photograph all 8 field terminal wiring pin assignments for rebuild reference. Hot-swap is not supported for the base assembly.
- Removal: Extract the paired KJ3221X1-BK1 front AO card first; unclip DIN rail mounting latches and slide the empty base horizontally off the carrier rail.
- Install: Clip the new unit firmly onto S-Series DIN rail; set rotary mechanical key to A4 AO profile; rewire each valve positioner loop per pre-install photos and torque screw terminals to OEM specified value. Reinsert the matching front AO card until key lock fully engages.
- Power-on Test: Restore rack power; send 4mA, 12mA, and 20mA setpoints to each channel to confirm stable valve tracking, then pull HART device diagnostic data to validate unbroken digital communication with field positioners.
FAQ
Q: Can this base operate without the matching KJ3221X1-BK1 front AO card?A: No, the base is a passive wiring carrier with no analog conversion hardware; all D/A conversion, loop drive and HART processing reside entirely on the paired front analog output module.Q: Is hot-swapping allowed for this terminal base assembly?A: Hot-swap functionality only applies to the front AO card. The base itself must be removed with full rack power disconnected to avoid simultaneous loss of all 8 analog control output signals.Q: What fault patterns indicate a damaged terminal base?A: Multiple channels show persistent valve position jitter with stable field wiring, rising contact resistance on screw terminals, inability to lock the paired front card via rotary key, or bent backplane edge pins causing intermittent LocalBus timeouts.Q: Can multiple HART positioners wire in parallel on a single AO terminal?A: No, parallel field devices increase total loop load resistance and drop compliance voltage below HART operating thresholds, creating intermittent device offline faults and lost diagnostic data. Each terminal supports one single 2-wire positioner only.Q: What warranty coverage applies to new surplus stock?A: A 12-month limited warranty covers terminal housing, screw clamp hardware and backplane connector manufacturing defects. Damage from ESD mishandling, over-torqued wiring, forced insertion into M-series racks, or deployment in unapproved hazardous zones is excluded from coverage.Q: Does the A4 rotary mechanical key lock prevent installation of non-AO front cards?A: Yes, each S-series terminal base model uses a unique rotary key profile. The A4 key physically blocks seating of discrete input, discrete output, thermocouple or FOUNDATION Fieldbus front modules to eliminate costly misconfiguration faults.
