Federal Signal AD-56P - Atkinson Dynamics Panel Mount Intercom, 24VDC - Heavy duty tamper resistant intercom. Single channel, two-way communications. Integrated volume control and Talk/Listen switch. Requires matching Atkinson Dynamics speaker (Model AD-SF-25, AD-SS-25 or AD-SO-25). Available in 12VDC, 24VDC and 120VAC 50/60Hz. UL and cUL Listed.
Federal Signal

AD-56P

Alternate Item Number: ad-56-atkinson-dynamics-intercom

UPC: 782979206811


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Overview

The **Federal Signal AD-56P Atkinson Dynamics Panel Mount Intercom** is a rugged, single-channel, two-way communication solution engineered for demanding industrial and commercial environments. Designed as a **heavy-duty, tamper-resistant intercom**, the AD-56P delivers reliable audio performance in applications where durability and security are critical. This **24VDC panel-mount unit** integrates intuitive controls, including an **integrated volume control** and **Talk/Listen switch**, ensuring effortless operation even in high-noise or high-stress scenarios. Compatible with Atkinson Dynamics speakers (Models AD-SF-25, AD-SS-25, or AD-SO-25), the AD-56P is part of a trusted ecosystem of industrial-grade communication devices. This intercom is built to withstand the rigors of **harsh industrial environments**, including manufacturing plants, warehouses, construction sites, and transportation hubs. Its **panel-mount design** allows for seamless integration into control panels, machinery, or security stations, while the **tamper-resistant construction** prevents unauthorized adjustments, safeguarding operational integrity. The **24VDC power rating** ensures compatibility with common industrial power systems, and the unit’s **UL and cUL listing** confirms compliance with stringent safety standards for North American markets. Federal Signal, a leader in industrial signaling and communication solutions, has designed the AD-56P to meet the needs of professionals who require **clear, reliable, and secure two-way communication**. Whether used for **machine operation coordination, emergency announcements, or security communications**, this intercom provides the clarity and robustness needed in critical applications. The **Talk/Listen switch** enables hands-free operation, reducing operator fatigue in prolonged use, while the **volume control** ensures optimal audio levels in varying ambient noise conditions. For installations requiring flexibility, the AD-56P is available in multiple voltage options, including **12VDC, 24VDC, and 120VAC 50/60Hz**, making it adaptable to diverse power infrastructures. Its **compact panel-mount form factor** simplifies installation in tight spaces, while the **heavy-duty construction** ensures long-term reliability. Professionals in industries such as **oil and gas, mining, marine, and heavy manufacturing** trust Federal Signal’s Atkinson Dynamics line for solutions that prioritize performance and durability. When selecting an industrial intercom, key considerations include **environmental resistance, ease of use, and compatibility with existing systems**. The AD-56P excels in all these areas, offering a **proven track record** in mission-critical applications. While this model is currently listed as discontinued, Federal Signal’s legacy of quality ensures that compatible replacement parts and alternative solutions are readily available. For engineers, facility managers, and procurement specialists, the AD-56P represents a **cost-effective, high-performance choice** for secure and efficient communication in industrial settings.
  • Heavy-duty, tamper-resistant construction for industrial durability
  • Single-channel, two-way communication with integrated Talk/Listen switch
  • Panel-mount design for seamless integration into control systems
  • Compatible with Atkinson Dynamics speakers (AD-SF-25, AD-SS-25, AD-SO-25)
  • UL and cUL listed for safety and compliance in North American markets

Specifications

-31 to 150
DEG F
24
VDC
24 Vdc
V
4.38
IN
4.67
IN
6.5
in
Application
Indoor
Brand Name
Federal Signal
Frequency Response
320 Hz - 8.0 kHz
Height
4.38 IN
Length
4.67 IN
Mounting
Wall
Mounting
Panel
Operating Current
1.65 AMP
Operating Temperature
-31 to 150 DEG F
Operating Temperature, Maximum
150 F
Operating Temperature, Maximum
65.5556 C
Operating Temperature, Minimum
-31 F
Operating Temperature, Minimum
-35 C
Operating Voltage
24VDC
Special Features
Brushed Aluminum Construction, Includes Gasket And Stainless Steel Hardware
Standard
UL Listed/cUL Listed
Standard
UL,cUL
Sub Brand
Atkinson Dynamics
Type
Panel Mount Intercom
Type
Intercoms
Voltage Rating
24 Vdc
Width
6.5 IN
Package Dimensions (L x W x H)
5.75 IN x 6.25 IN x 7.87 IN
Package Dimensions (L x W x H)
14.605 cm x 15.875 cm x 19.9898 cm
Package Weight (Imperial)
4.000 L
Package Weight (Metric)
1.814 kg
Atkinson Dynamics Panel Mount Intercom, 12VDC, Primary Unit, Remote Power - Heavy duty tamper resistant intercom. Single channel, two-way communications. Integrated volume control and Talk/Listen switch. Requires matching Atkinson Dynamics speaker (Model AD-SF-25, AD-SS-25 or AD-SO-25). Available in 12VDC, 24VDC and 120VAC 50/60Hz. UL and cUL Listed.

AD-26PC-1

Atkinson Dynamics Panel Mount Intercom, 12VDC, Primary Unit, Remote Power - Heavy duty tamper resistant intercom. Single channel, two-way communications. Integrated volume control and Talk/Listen switch. Requires matching Atkinson Dynamics speaker (Model AD-SF-25, AD-SS-25 or AD-SO-25). Available in 12VDC, 24VDC and 120VAC 50/60Hz. UL and cUL Listed.
Intercom, 12VDC, T/L Switch, Volume Control, Pre-Amp Equipped, Remote Volume Control Equipped, Panel Mount

AD-26P-8-M44

Intercom, 12VDC, T/L Switch, Volume Control, Pre-Amp Equipped, Remote Volume Control Equipped, Panel Mount
Intercom, 12VDC, T/L Switch, Volume Control, Secondary Unit, Panel Mount

AD-26PD

Intercom, 12VDC, T/L Switch, Volume Control, Secondary Unit, Panel Mount
Intercom, 12VDC, T/L Switch, Volume Control, Primary Unit, Panel Mount

AD-26PC

Intercom, 12VDC, T/L Switch, Volume Control, Primary Unit, Panel Mount
Atkinson Dynamics Panel Mount Intercom, 120VAC - Heavy duty tamper resistant intercom. Single channel, two-way communications. Integrated volume control and Talk/Listen switch. Requires matching Atkinson Dynamics speaker (Model AD-SF-25, AD-SS-25 or AD-SO-25). Available in 12VDC, 24VDC and 120VAC 50/60Hz. UL and cUL Listed.

AD-27P

Atkinson Dynamics Panel Mount Intercom, 120VAC - Heavy duty tamper resistant intercom. Single channel, two-way communications. Integrated volume control and Talk/Listen switch. Requires matching Atkinson Dynamics speaker (Model AD-SF-25, AD-SS-25 or AD-SO-25). Available in 12VDC, 24VDC and 120VAC 50/60Hz. UL and cUL Listed.
Atkinson Dynamics Panel Mount Intercom, 120VAC, Primary Unit - Heavy duty tamper resistant intercom. Single channel, two-way communications. Integrated volume control and Talk/Listen switch. Requires matching Atkinson Dynamics speaker (Model AD-SF-25, AD-SS-25 or AD-SO-25). Available in 12VDC, 24VDC and 120VAC 50/60Hz. UL and cUL Listed.

AD-27PC

Atkinson Dynamics Panel Mount Intercom, 120VAC, Primary Unit - Heavy duty tamper resistant intercom. Single channel, two-way communications. Integrated volume control and Talk/Listen switch. Requires matching Atkinson Dynamics speaker (Model AD-SF-25, AD-SS-25 or AD-SO-25). Available in 12VDC, 24VDC and 120VAC 50/60Hz. UL and cUL Listed.
Atkinson Dynamics Panel Mount Intercom, 120VAC, Call Button - Heavy duty tamper resistant intercom. Single channel, two-way communications. Integrated volume control and Talk/Listen switch. Requires matching Atkinson Dynamics speaker (Model AD-SF-25, AD-SS-25 or AD-SO-25). Available in 12VDC, 24VDC and 120VAC 50/60Hz. UL and cUL Listed.

AD-27PA

Atkinson Dynamics Panel Mount Intercom, 120VAC, Call Button - Heavy duty tamper resistant intercom. Single channel, two-way communications. Integrated volume control and Talk/Listen switch. Requires matching Atkinson Dynamics speaker (Model AD-SF-25, AD-SS-25 or AD-SO-25). Available in 12VDC, 24VDC and 120VAC 50/60Hz. UL and cUL Listed.
Intercom, 12VDC, T/L Switch, Volume Control, Call Button, Microphone Ready

AD-26A-7

Intercom, 12VDC, T/L Switch, Volume Control, Call Button, Microphone Ready
Intercom, 24VDC-120VAC, T/L Switch, Volume Control, Hazardous Location

AD-28X-MV

Intercom, 24VDC-120VAC, T/L Switch, Volume Control, Hazardous Location
Intercom, 120VAC, T/L Switch, Volume Control, Call Button, Foot Pedal Ready

AD-27A-2

Intercom, 120VAC, T/L Switch, Volume Control, Call Button, Foot Pedal Ready
Intercom, 120VAC, T/L Switch, Volume Control, Auxiliary Signal Ready

AD-27-3

Intercom, 120VAC, T/L Switch, Volume Control, Auxiliary Signal Ready
AudioMaster Two-Way Intercom with Noise Canceling Mic, UL and cUL, Multi-voltage 24VDC or 120-240VAC

310-MV-MNC

AudioMaster Two-Way Intercom with Noise Canceling Mic, UL and cUL, Multi-voltage 24VDC or 120-240VAC

Frequently Asked Questions

What is the operating voltage for the AD-56 intercom?

The AD-56 intercom operates on 24VDC.

What are the operating and standby currents for AD-56?

The AD-56 model has an operating current of 1.65 A and a standby current of 100 mA.

What is the frequency response of the AD-56 intercom?

The AD-56 intercom has a frequency response range of 320Hz to 8.0Khz.

What is the speaker rating for these intercoms?

All Atkinson Dynamics Wall Mount Intercoms, including the AD-56, feature a 25-watt speaker.

What is the operating temperature range for the intercom?

The intercoms can operate in temperatures ranging from -31°F to 150°F (-35°C to 66°C).

What are the physical dimensions of the AD-56 intercom?

The AD-56 intercom measures 9.88 inches in height, 6.50 inches in width, and 5.03 inches in depth.

What type of enclosure does the AD-56 intercom have?

The intercom features a corrosion-resistant cast aluminum housing with a rugged powder coat finish, classified as a Type 4X enclosure.

Can the AD-56 intercom be used in outdoor environments?

Yes, these heavy-duty industrial intercoms are designed for both indoor and outdoor communication applications.

Is the AD-56 intercom certified for marine use?

Yes, the AD-56 intercom is Marine rated, UL and cUL listed, and CSA Certified.

What communication capabilities does the AD-56 intercom offer?

The intercom provides single-channel, two-way communication with integrated volume control and a Talk/Listen switch.

How to Install the AD-56P Intercom

This guide provides step-by-step instructions for installing and configuring the AD-56P intercom system, ensuring proper mounting, wiring, and initial setup.

Estimated time: 45m

Tools needed:

Screwdriver, Wire strippers, Multimeter

Supplies needed:

Mounting screws, Terminal connectors, 1K, 1W resistor

  1. Select the mounting location

    Choose a flat and rigid surface for mounting the intercom, ensuring it can support the weight of the unit.

  2. Mount the intercom

    Secure the intercom to the selected surface using the two mounting ears and appropriate screws. Ensure the unit is level and firmly attached.

  3. Connect the power supply

    Plug the intercom into a nearby power source. For 24VDC models, connect the black wire to +DC power and the white wire to common. Ensure proper grounding.

  4. Wire the audio connections

    Connect the audio inputs in parallel using appropriately sized audio cables. Optionally, install the included 1K, 1W resistor across the audio lines to reduce noise.

  5. Verify connections

    Use a multimeter to check all connections for continuity and ensure there are no short circuits before powering on the unit.

  6. Power on the intercom

    Turn on the power supply and test the intercom functionality by pressing the talk/listen switch and speaking into the microphone.

  7. Calibrate the volume

    Adjust the volume control on the intercom to the desired level for both incoming and outgoing audio.

Frequently Asked Questions about Federal Signal

What certifications and standards do Federal Signal products comply with?

Federal Signal products are certified across multiple international standards, including UL (Underwriters Laboratories) in the USA, CSA (Canadian Standards Association), CE (European Community), UKCA (United Kingdom), EAC (Russia), and C-Tick (Australia and New Zealand). Their products meet rigorous safety and performance standards for industrial environments, with specific compliance in electrical equipment enclosures, functional safety, and environmental protection ratings.

What is Federal Signal's warranty policy?

Federal Signal offers a comprehensive limited warranty covering most products for 1-5 years from the date of delivery, with specific terms varying by product category. Mechanical sirens, beacons, speakers, and sounders typically receive 5-year parts and labor coverage, while electronic sirens and controllers generally have 2-year warranties. All warranties require return to the factory for service, and on-site services are not included. Certain components like domes, lenses, lamps, and batteries are specifically excluded from warranty coverage.

What industries and applications are Federal Signal products used for?

Federal Signal products are used across multiple critical industrial and municipal sectors for notification, communication, and safety systems. Their product lines cover essential applications including fire alarm systems, public address and telephony, outdoor warning systems, visual and audible signals, and emergency communication networks. Key industries served include manufacturing, municipal emergency services, industrial facilities, and infrastructure environments where clear, reliable communication and safety signaling are paramount.

What technical support does Federal Signal offer?

Federal Signal offers comprehensive technical support through their dedicated [email protected] email and direct phone line at +1 708.534.4756. Their support covers a wide range of notification and communication solutions, including technical assistance for products in public address, telephony, fire alarm, visual and audible signals, outdoor warning systems, and intercoms.

What are the main product lines offered by Federal Signal?

Federal Signal offers comprehensive notification and communication solutions across multiple product lines, including Visual Signals, Audible Signals, Telephony, Intercoms, Fire Alarm, Outdoor Warning Systems, Public Address, and Initiating Systems. Their product range is designed to provide clear communications and critical process notifications that enhance safety and compliance in industrial and public environments.

What are the key features of Federal Signal products?

Federal Signal products are comprehensive notification solutions designed to enhance safety and communication across industrial environments. Their key features include visual and audible signals, fire alarm systems, outdoor warning systems, public address capabilities, telephony, and intercoms. These products provide critical process notifications, ensure safety compliance, and offer advanced technologies like secure encrypted communication, cloud-based control systems, and customizable emergency response interfaces.

What environmental ratings do Federal Signal products have?

Federal Signal products offer robust environmental ratings across multiple standards, including UL 508A, CSA, NEMA, and IEC 60529. Their enclosures are rated for Type 1, 2, 3, 4, 4X, 12, and 13 environments, with IP66 protection, and can operate in temperatures ranging from -40°F to 266°F. These ratings ensure superior protection against dust, water, corrosion, and extreme conditions for indoor and outdoor industrial applications.

What accessories are available for Federal Signal products?

Federal Signal offers multiple accessories for their signaling products, including coupling kits, cable entry adapters, indicator rings, legend plates, and mounting brackets. Key accessories include E-Box endcap kits with M20 and M25 openings, U-Brackets for dual configurations, and color-coded indicator rings in black, blue, green, magenta, red, and yellow. Additional options like adapters for NPT connections and specialized mounting hardware are also available for their Global Series signaling platforms.

What communication protocols do Federal Signal products support?

Federal Signal supports multiple industrial communication protocols including PROFIBUS DP, PROFINET, EtherNet/IP, CANopen, and Modbus RTU. These protocols enable flexible network integration across various industrial automation environments, supporting both traditional fieldbuses and modern Ethernet-based communication standards.

How are Federal Signal products typically installed?

Federal Signal products are typically installed using professional mounting configurations that include wall brackets, base stations, and specialized mounting hardware. Depending on the specific product line—such as outdoor warning systems, visual signals, or audible signals—installation involves precise mounting options like wall-mount antenna brackets, base station radio packages, and modular component assemblies. Each product configuration includes specific mounting accessories like endcaps, adapters, and terminal blocks to ensure secure and compliant installation in industrial and safety-critical environments.