SPASI23 Technical Datasheet: 16-Channel Analog Input Module For Symphony Plus HR Series-dyyweb.com

SPASI23 Technical Datasheet: 16-Channel Analog Input Module for Symphony Plus HR Series Jul 01, 2026

What is the SPASI23?

The SPASI23 is a 16-channel analog input module that belongs to the ABB Symphony Plus distributed control system family. It processes up to 16 analog field inputs simultaneously, with each channel equipped with a dedicated 24-bit analog-to-digital converter. The module handles input processing, calibration, point value calculations, lead wire resistance adjustment, cold junction compensation, gain and offset adjustment, and engineering unit conversion automatically. It is classified as a small equipment unit under WEEE Category 5 and carries HS code 85389081.

Why Choose the SPASI23?

The module supports 16 independently configured channels, each capable of accepting thermocouple types B, E, J, K, L, N (14 AWG and 28 AWG), R, S, T, and U, as well as Chinese type E and Chinese type S. It also handles three-wire RTD inputs including 10 ohm copper, 100 ohm platinum (U.S. Lab Standard, U.S. Industry Standard, and European Standard), 120 ohm nickel, and Chinese 53 ohm copper. High-level voltage spans from −10 VDC to +10 VDC, with additional ranges of 1 to 5 VDC, 0 to 5 VDC, and 0 to 10 VDC. Millivolt inputs cover −100 mV to +100 mV and 0 to 100 mV. This range of compatibility allows a single module to replace multiple specialized input cards, reducing hardware count and cabinet space in typical installations.

What Are the Key Features?

Each channel operates with a dedicated 24-bit ADC, providing finer measurement resolution than the 14-bit architecture found in comparable modules such as the SPFEC12. Input circuit offset, gain, and nonlinearity are captured during factory calibration and applied continuously during operation. The module also performs background recalibration to compensate for component aging and thermal drift without requiring manual intervention. Cold junction compensation for thermocouple inputs is handled through built-in references at each termination device, with the option to use a remote reference from another input on the same or a different I/O module. Engineering-unit conversion to degrees Celsius or Fahrenheit is computed automatically for all temperature sensor inputs using standard linearization tables. The module supports hot-swappable installation, allowing removal or insertion under power without system shutdown.

Parameters Specifications

Detailed Parameter	Part Number：SPASI23
Power requirements	+ 5 VDC, ± 5% at 500 mA typical
Analog input channels	16 independently configured channels
Millivolt	-100 mV to +100 mV, 0 to 100 mV
Ambient temperature	0 °C to 70 °C (32 °F to 158 °F)
Product Type	I-O_Module
Channel Type	AI
Number of Input Channels	16
Thermistors	-50°C to +150°C
Voltage	-10 V to +10 V
Current	-20 mA to +20 mA
Accuracy	0.1% of full scale
Conversion Time	250 min
Isolation	2500 V RMS
Power Consumption	2.5 W

The difference between SPFEC12 and SPASI23

	SPFEC12	SPASI23
Main functions	Factory loop interface / communication control	analog input acquisition.
System Role	Responsible for INFI-NET communication, connecting the host computer and control unit	directly connects to industrial field sensors to collect data.
Number of channels	16 communication channels (management network node) without physical I/O	analog input channels.
Signal type	Network communication protocol data	Thermocouple (TC), millivolt (mV), resistance temperature detector (RTD), high-level signal.
Location of use	Typically installed in the system communication cabinet or management node.	Installed on the I/O rack of the field process control unit (PCU).
Primary Application	Standard analog signal acquisition from field transmitters	Temperature measurement (TC/RTD) + general analog signal acquisition
Design Target	Conventional transmitters and standard analog inputs	Multi-signal types including temperature sensors

Frequently Asked Questions

What input signal types can be configured per channel on the SPASI23?

Each of the 16 channels can be independently programmed for thermocouple types B, E, J, K, L, N (14 AWG and 28 AWG), R, S, T, and U, as well as Chinese type E and Chinese type S. Additional supported inputs include −100 to +100 mV, 0 to 100 mV, three-wire RTD (10, 100 U.S. Lab Standard, 100 U.S. Industry Standard, 100 European, 120 nickel, and Chinese 53 ohm copper), −10 to +10 VDC high-level voltage, 1 to 5 VDC, 0 to 5 VDC, and 0 to 10 VDC. Channel resolution and input type are selectable independently, permitting mixed-signal configurations on a single module.

Does the SPASI23 require periodic user calibration?

No. The module records input circuit offset, gain, and nonlinearity errors during a one-time factory calibration procedure. These measurements provide continuous error compensation during normal operation. Additionally, the module executes automatic recalibration in the background to offset component aging and temperature drift. No user-initiated calibration is necessary throughout the operational life of the device.

What modifications are needed when replacing an IMASI03 or IMASI13 with the SPASI23?

Migration from legacy IMASI03 or IMASI13 modules to the SPASI23 requires updating specification S11 in function code 216 to account for differences in available resolution choices. Engineers should also verify power supply sizing calculations and confirm that the system current budget accommodates the SPASI23's power consumption characteristics, as these may differ from the legacy modules being replaced.

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