Product Core Brief
- Model:
- Brand: ABB / ABB Bailey
- Series: Bailey INFI 90 / Symphony / Symphony Plus legacy DCS I/O
- Core Function: 16-channel analog input module for process signal acquisition.
- Product Type: ABB Bailey/Symphony Analog Input Module
- Key Specs: 16 AI channels; 4–20 mA / TC / RTD / mV / high-level signals; rack-mounted; hot-swappable in supported systems
- Condition: New Original / New Surplus (verify per lot)
- Status: Legacy DCS spare
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB / ABB Bailey |
| Model | |
| Product Type | Analog Input Module |
| System Compatibility | Bailey INFI 90, Symphony, Symphony Plus |
| Channels | 16 analog inputs |
| Signal Types | 4–20 mA, TC, RTD, mV, high-level signals (confirm per revision) |
| Mounting | Rack-mounted; hot-swappable in supported configurations |
| Power | Supplied by I/O chassis/backplane |
| Availability | Surplus / OEM replacement stock |
Note: 具体信号类型、分辨率、隔离等级、固件/硬件版本需以铭牌和原厂手册为准。不同供应商对 SPASI23 的描述差异较大，部分页面把它写成“数字量模块”“16DI/16DO”“带 Modbus/Profibus 通信”，这些与 Bailey/Symphony AI 模块定位不符，可信度不足。
Product Introduction
The ABB SPASI23 is a legacy analog input module used in ABB Bailey INFI 90, Symphony, and Symphony Plus distributed control systems. It provides 16 analog input channels for acquiring process signals such as 4–20 mA current loops, thermocouple/RTD temperature signals, millivolt signals, and high-level analog inputs.
The module is typically installed in a Bailey/Symphony I/O rack and receives power from the backplane. It is commonly used in power generation, chemical processing, oil and gas, and other continuous process industries where reliable analog signal acquisition is required.
Because SPASI23 is a legacy DCS module, its main value today is as a verified replacement for existing Bailey/Symphony installations. Always confirm the exact hardware revision and supported signal types before deployment.
QA & Testing SOP
- Nameplate verification: Confirm ABB/Bailey branding, SPASI23 model, hardware revision, and serial number.
- Physical inspection: Check backplane connectors, pins, mounting hardware, and PCB condition.
- Revision check: Verify whether the unit supports 4–20 mA only, or also TC/RTD/mV inputs.
- Rack test: Install into a compatible Bailey/Symphony rack and verify module status LEDs.
- Channel test: Inject known analog signals and confirm correct readings in the DCS.
Installation Pitfalls
❗ Not a digital I/O module. SPASI23 is an analog input module; descriptions listing 16DI/16DO should be rejected unless independently verified.
❗ Not a standalone PLC. It must be installed in a compatible Bailey/Symphony I/O rack.
❗ Signal type must match. TC/RTD/mV/4–20 mA compatibility depends on the specific hardware revision.
❗ Hot-swap only if supported. Do not assume hot-swappable operation without confirming the host rack and system configuration.
Replacement steps:
- Record slot position, channel assignments, and DCS configuration.
- Verify system redundancy and hot-swap policy.
- Replace the module in the correct rack slot.
- Verify module status LEDs and DCS channel readings.
- Perform channel-by-channel signal injection if required.
Technical FAQ
1. Is SPASI23 still produced by ABB?
It should be treated as a legacy DCS spare. Factory availability must be confirmed with ABB or an authorized distributor.
2. What signals does SPASI23 support?
Typically 4–20 mA, TC, RTD, mV, and high-level analog signals, but the exact supported types depend on the hardware revision.
3. Is it compatible with AC800M?
Some suppliers list it under Symphony/AC800M-related catalogs, but SPASI23 is primarily associated with Bailey INFI 90 and Symphony platforms. Compatibility must be confirmed against the actual system documentation.
4. Is it a digital module?
No. Reliable supplier listings identify SPASI23 as an analog input module.
5. What should I check before buying?
Confirm the hardware revision, supported signal types, rack compatibility, channel health, and whether the unit has been tested in a live DCS rack.
