Product Introduction

The ABB SPDSI22 is a Harmony Rack digital input module with 16 optically isolated channels. Each channel can be configured for the documented DC or AC field-voltage class, making it the HR migration module for several legacy INFI 90 digital input types.

Technical Specifications

Compatibility & Replacement

Applications & Fault Scenarios

• Status and alarm inputs from contacts, limit switches, relays, breakers and interlocks.
• Mixed plant standards where individual channels require documented 24 VDC, 48 VDC, 125 VDC or 120 VAC configuration.
• Maintenance searches commonly follow a wrong AC/DC or voltage selection, FC84/address mismatch, missing input, field-polarity error, bus fault or termination problem.
• Loss of interlock or protection indications can block starts, force conservative logic states or extend downtime while the field circuit is proved.

Configuration & Installation

• Program every channel for its actual field-voltage class and verify the FC84/module-address mapping.
• When replacing IMDSI02, note the legacy termination restriction: inputs 7/8 and 15/16 share commons in the mapped arrangement and each pair must use the same voltage source.
• When migrating an input-only IMDSM05, complete the ABB-specified dipshunt and field-polarity changes before energizing the inputs.

Diagnostics & Maintenance

• Compare the module indication and controller point quality with the measured field voltage before replacing the input module.
• If a whole group is missing, inspect module power, rack communication, address, termination common and cable connection.
• Preserve the original channel-voltage schedule and use grounded ESD controls during exchange.

Migration Notes

• HR mapping covers the listed IMDSI models through SPDSI22.
• SD-series migration depends on field-voltage class; mixed high- and low-voltage points may require more than one SD module.
• Mixed IMDSM05 I/O or a Digital Logic Station function requires a separate engineering solution.

Official Manufacturer Sources

Amikon Service

Request for Quotation

Multi-brand Spare Parts Also Requested

These models are separate sourcing references, not stated replacements for SPDSI22. Compatibility and availability must be confirmed independently.

FAQ