ABB Bailey IMAOM01 Analog Output Module

This analog output module converts digital control signals into analog values for ABB Bailey INFI 90 systems. It drives field actuators such as valves, dampers, and positioners. Therefore, it enables precise control of process variables in power generation plants.

Physical and Output Specifications

The ABB Bailey IMAOM01 measures 25.0 cm in length and 18.0 cm in width. Moreover, its module weight equals approximately 0.88 kg for rack mounting. A single 48-pin male connector links this module to the INFI 90 backplane. Additionally, the module provides four independent analog output channels.

Parameter	Specification
Brand	ABB Bailey
Full Model	IMAOM01
Category	Analog Output Module
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	0.88 kg (1.94 lbs)
Backplane Interface	1 x 48-pin Male Connector (INFI 90 Rack)
Primary Interface	1 x 16-pin Removable Screw Terminal Block
Operating Voltage	24 VDC from Backplane (19.2 to 28.8 VDC)
Power Consumption	4.5 W (Typical)
Analog Output Channels	4 Independent Channels
Output Signal Range	0-10 VDC, -10 to +10 VDC, 4-20 mA (Selectable)
Resolution	12 Bits (0 to 4095 Counts)
Settling Time	10 ms (Typical)
Output Accuracy	±0.2% of Full Scale at 25°C
Accuracy Drift	±0.01% per °C
Output Impedance (Voltage)	0.1 Ω (Typical)
Output Impedance (Current)	500 Ω (Typical)
Maximum Output Current	25 mA per Channel
Output Protection	Short Circuit + Overvoltage
On-Board Components	4 DAC Chips + 4 Output Drivers + 4 Protection Diodes + 1 Microcontroller + 2 Memory Chips + 1 Voltage Reference IC + 1 EMI Filter
Energy Storage	3 x 100 µF Electrolytic Capacitors (35V) + 2 x 10 µF Tantalum (25V)
Isolation Rating	1500 Vrms (Outputs to Backplane)
Update Rate	4 ms per Channel (16 ms for All 4 Channels)
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	1 Green LED (Power) + 1 Green LED (Active) + 1 Red LED (Fault) + 4 Green LEDs (Output Valid)

Analog Output Features and Signal Generation

The ABB Bailey IMAOM01 generates precise analog signals for field actuator control. Specifically, each channel produces 0-10 VDC, -10 to +10 VDC, or 4-20 mA outputs. In addition, the 12-bit resolution provides 4096 discrete steps for smooth control. Moreover, the settling time of 10 milliseconds ensures fast response to setpoint changes. Furthermore, short circuit protection prevents damage from accidental wiring faults. Consequently, this module drives valves, dampers, and positioners reliably.

Output Mode Selection and Flexibility

You can configure each analog output channel independently for voltage or current mode. For instance, voltage mode suits high-impedance loads such as VFD speed references. In addition, current mode drives 4-20 mA loop-powered positioners over long distances. Moreover, the output accuracy of ±0.2 percent ensures precise actuator positioning. Furthermore, the low output impedance in voltage mode maintains signal integrity under load. Thus, the ABB Bailey IMAOM01 adapts to various field actuator requirements.

Energy Storage and Signal Integrity

This analog output module stores energy using five onboard capacitors for power filtering. Specifically, three electrolytic capacitors smooth the 24 VDC supply for stable DAC operation. In addition, two tantalum capacitors provide high-frequency noise suppression for output drivers. Moreover, the isolated outputs protect the backplane from field wiring faults. Furthermore, the voltage reference IC maintains accuracy across temperature variations. Therefore, this module delivers clean analog signals in electrically noisy turbine environments.

Installation and Diagnostic Indicators

Seven LED indicators provide operational status at a glance on this module. First, a green Power LED lights when the backplane supply voltages are present. Second, a green Active LED flashes during normal analog output operation. Third, a red Fault LED indicates short circuits, overcurrent, or configuration errors. Additionally, four green Output Valid LEDs illuminate when each channel is enabled and functioning correctly. Furthermore, the module includes a locking ejector for secure backplane insertion. Thus, you can diagnose analog output status instantly without external tools.