Description

ABB SPASI23 | DCS Field Signal Acquisition Card for Power & Chemical Process Plants

Product Core Brief

Model: SPASI23
Brand: ABB
Series: Symphony Plus (Symphony / Bailey INFI90 DCS)
Core Function: Collect multi-type analog sensor signals and convert data for DCS controllers
Type: Universal Analog Input Module
Key Specs: 16 isolated channels; Supports TC, RTD, mV signals; 24-bit A/D conversion

Condition: New Surplus, non-refurbished

⚠️ Original production discontinued by ABB, limited stock on hand

Product Introduction

For maintenance teams supporting legacy Symphony Plus DCS platforms, the SPASI23 serves as the universal analog input front end for field temperature and low-level sensor signals. It evolves from the older IMASI23 module and fits standard Symphony rack slots without mechanical modification.

It accepts multiple low-level input signals directly from field transmitters and thermal sensors. 24-bit analog-to-digital conversion keeps measurement deviation low under continuous load. Many power generation and pulp & paper facilities rely on this board to track boiler temperatures, reactor process readings and pipeline flow data. Galvanic isolation per channel cuts noise interference from long field wiring.

Key Technical Specifications

Parameter	Specification
Part Number	SPASI23
Compatible System	Symphony Plus / Bailey INFI90 DCS
Channel Count	16 analog input channels
Supported Signal Types	Thermocouple(TC), RTD, millivolt(mV)
ADC Resolution	24 bit
Channel Isolation	Galvanic isolation per channel
Operating Supply	24 V DC backplane power
Operating Temperature	-20 ℃ ~ +60 ℃
Mounting Method	Standard Symphony rack vertical slot installation
Status Indicators	POWER LED, FAIL diagnostic LED
Net Weight	0.77 kg
Dimension (W×H×D)	272 mm × 361 mm × 74 mm
Protection Class	IP20, cabinet installation only

ABB SPASI23

Installation & Configuration Guide

Phase 1: Pre-Installation (Estimated 12 min)

⚠️ Safety Reminders

Schedule planned downtime and lock related process loops
Cut power supply to the entire DCS rack assembly
Wait minimum 5 minutes to discharge internal circuit capacitors
ESD protection is mandatory during all module handling

Required Tools

ESD wrist strap and anti-static work mat
PH1 cross screwdriver
Digital multimeter
Mobile phone for capturing wiring layout and front panel settings

Preparation tasks

Export current DCS configuration archive
Take clear photos of all field wiring terminals connected to the module
Record module slot position inside the rack to avoid misplacement

Phase 2: Old Module Removal (Estimated 12 min)

Confirm rack power is fully disconnected
Label each field cable terminal before disconnection
Unscrew wiring terminals and separate all sensor cables
Loosen the two locking knobs on the module front panel
Pull the module straight outward from the rack backplane
Inspect backplane connector pins for oxidation or bending

⚠️ Warning: Do not twist the module during removal. Bent backplane pins cause unstable communication after replacement.

Phase 3: New Module Installation (Estimated 15 min)

Wear ESD wrist strap before unpacking SPASI23
Visual inspection: check PCB surface, components and edge connector
Align the module with rack guide rails and insert horizontally
Push fully into the slot, tighten front locking knobs securely
Restore field wiring strictly following photographed records
Double-check all terminal screw torque to prevent loose connections

Pre-power-on checklist

[ ] Module fully engaged with backplane connector

[ ] All sensor wiring terminated correctly

[ ] No stray wire strands creating short-circuit risk

[ ] Unused channels properly insulated

Phase 4: Power-On & Commissioning (Estimated 22 min)

Restore rack DC power supply
Observe front panel LED: steady POWER light means normal power feed
Launch DCS engineering tool to scan hardware configuration
Confirm the system recognizes SPASI23 correctly
Verify channel type configuration matches connected sensors (TC/RTD/mV)
Monitor live measurement values for each channel
Run continuous monitoring for 30 minutes to confirm no diagnostic alarms

Common troubleshooting tips

FAIL LED illuminated: Check backplane contact or module hardware fault
Abnormal temperature readings: Verify sensor wiring polarity and channel configuration
Random signal drift: Check shielding grounding of field sensor cables
ABB SPASI23

Frequently Asked Questions (FAQ)

Can SPASI23 directly replace IMASI23?

Mechanical fit is identical. Minor firmware and configuration differences exist on some DCS software revisions. Validate configuration parameter mapping before commissioning to avoid signal reading errors.
Does this module support hot swap during running operation?

The hardware allows hot extraction, but removal will interrupt all 16 analog input channels. Unplanned online replacement triggers process alarms. Carry out swap during scheduled shutdowns.
Which sensors can connect to SPASI23 channels?

Suitable for RTD temperature probes, all standard thermocouple types and millivolt output sensors. It cannot accept standard 4–20 mA transmitters directly.
What causes unstable readings on temperature channels?

Poor shielding, reversed sensor wiring or ground loops between field equipment and control cabinet. Route sensor cables separately from high-power AC cables to reduce electromagnetic interference.
How long is the warranty for SPASI23?

We provide 12-month warranty under standard industrial operating conditions. Damage caused by incorrect wiring, surge voltage or ESD will void warranty coverage.
Can I mix SPASI23 with other analog modules in one Symphony rack?

Yes. The Symphony rack supports mixed I/O module types. Always confirm total rack power consumption does not exceed the backplane power supply rating.
Is technical documentation available for SPASI23?

We can share official datasheet and wiring reference after order confirmation. All parameter settings should be cross-referenced with original ABB operation manual.