ABB Bailey NDLS01 Logic Module | 16 Ch 24V Digital Input INFI 90

This logic module provides discrete input capability for ABB Bailey INFI 90 automation systems. It interfaces directly with field sensors such as limit switches and push buttons. Therefore, it captures real-time status signals for turbine and process control applications.

Physical and Input Specifications

The ABB Bailey NDLS01 measures 25.0 cm in length and 18.0 cm in width. Moreover, its module weight equals approximately 0.82 kg for rack mounting. A single 48-pin male connector links this module to the INFI 90 backplane. Additionally, this module contains sixteen independent digital input channels.

Parameter	Specification
Brand	ABB Bailey
Full Model	NDLS01
Category	Logic Module (Digital Input)
Dimensions (L x W x H)	25.0 cm x 18.0 cm x 5.5 cm (9.84″ x 7.09″ x 2.17″)
Module Weight	0.82 kg (1.81 lbs)
Backplane Interface	1 x 48-pin Male Connector (INFI 90 Rack)
Primary Interface	1 x 32-pin Removable Screw Terminal Block
Operating Voltage	24 VDC from Backplane (19.2 to 28.8 VDC)
Power Consumption	3.5 W (Typical)
Input Channels	16 Independent Channels
Input Type	24 VDC (Sink/Source Selectable per Group)
Input Voltage Range	0 to 30 VDC
Input On-State Voltage	> 15 VDC
Input Off-State Voltage	< 5 VDC
Input On-State Current	8 mA Typical at 24 VDC
Input Impedance	3.0 kΩ
Input Response Time (On)	4 ms (Typical)
Input Response Time (Off)	4 ms (Typical)
Input Isolation	Optocoupler (1500 Vrms)
Common Configuration	16 Inputs Share Two Commons (8 per Group)
On-Board Components	16 Optocouplers + 16 Current Limiting Resistors + 4 Protection Diodes + 1 EMI Filter + 1 Voltage Regulator + 1 LED Driver IC
Energy Storage	2 x 100 µF Electrolytic Capacitors (35V) + 2 x 10 µF Tantalum (25V)
Operating Temperature	0°C to +55°C (32°F to 131°F)
Storage Temperature	-25°C to +85°C (-13°F to 185°F)
Mounting Type	INFI 90 Rack (Single Slot)
Status Indicators	16 Green LEDs (One per Channel) + 1 Green LED (Power)

Input Channel Features and Signal Processing

The ABB Bailey NDLS01 accepts sixteen independent discrete input signals at 24 VDC. Specifically, each input includes an optocoupler for complete electrical isolation from the logic side. In addition, the input impedance of 3.0 kΩ suits standard industrial proximity sensors. Moreover, all sixteen channels respond within 4 milliseconds to signal changes. Consequently, this module captures fast field events without missing critical transitions.

High-Density Input Configuration

Sixteen input channels fit into a single INFI 90 rack slot with this logic module. For instance, you can monitor up to sixteen limit switches or push buttons with one module. In addition, the two common groups allow mixed sink and source wiring if needed. Moreover, the removable terminal block accepts 18-22 AWG stranded or solid wires. Thus, this module saves valuable rack space in large turbine control systems.

Energy Storage and Operational Stability

This logic module stores energy using four onboard capacitors for power filtering. Specifically, two electrolytic capacitors smooth the 24 VDC supply for stable optocoupler operation. In addition, two tantalum capacitors provide high-frequency noise suppression for the input circuits. Furthermore, these capacitors maintain stable operation during brief power interruptions. Therefore, the ABB Bailey NDLS01 continues functioning through minor supply dips reliably.

Installation and Diagnostic Indicators

Seventeen LED indicators provide operational status at a glance on this module. First, sixteen green LEDs light when each corresponding input receives an active 24 VDC signal. Second, a green Power LED indicates the presence of backplane operating voltage. Additionally, the module includes a locking lever for secure rack attachment. Thus, you can diagnose system status instantly without external tools or meters.