ABB SPDSI22 Harmony Rack Digital Input Module

The ABB SPDSI22 (frequently listed as SPDIS22) is a 16-channel universal digital input module for ABB Symphony Plus and Bailey INFI 90 Harmony Rack I/O systems. It captures discrete status signals from field devices such as limit switches, relay contacts, and pushbuttons. The module supports wide-ranging AC and DC field voltages—including 24 VDC, 48 VDC, 125 VDC, and 120 VAC—allowing direct connection of field inputs without external signal conditioning interfaces.

Channel Configuration and Input Conditioning

Each of the 16 digital input channels is galvanically isolated and can be configured individually using 32 internal jumpers. These onboard jumpers set input thresholds and filtering conditions to match specific voltage levels and signal characteristics. Field inputs operate with low current draw, taking approximately 4.5 mA at 125 VDC and 6 mA at 120 VAC to minimize field contact loading and heat generation.

Rack Power and Hardware Integration

Designed for direct slot installation in Harmony Rack backplanes, the module draws internal power from a +5 VDC logic bus (±5%) with a typical current consumption of 95 mA. The unit measures 12.5 cm x 17.8 cm x 2.5 cm and weighs 0.3 kg, providing high channel density for control panel layouts and retrofit installations.

Frequently Asked Questions

Q: What input voltages can be connected to the ABB SPDSI22 module? A: The module supports 24 VDC, 48 VDC, 125 VDC, and 120 VAC field inputs across its 16 channels.

Q: How are individual input channels configured on the SPDSI22? A: Each channel is customized using 32 onboard jumpers to set specific input voltage ranges and operating thresholds.

Q: What power supply voltage does the module require from the rack backplane? A: It operates on a +5 VDC logic supply (±5%) from the backplane, drawing approximately 95 mA under standard operation.