
Federal Signal
AD-56P
Alternate Item Number: ad-56-atkinson-dynamics-intercom
UPC: 782979206811
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Overview
- 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 |

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.
AD-26P-8-M44
Intercom, 12VDC, T/L Switch, Volume Control, Pre-Amp Equipped, Remote Volume Control Equipped, Panel Mount
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.
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.
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.
310-MV-MNC
AudioMaster Two-Way Intercom with Noise Canceling Mic, UL and cUL, Multi-voltage 24VDC or 120-240VACFrequently 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
- Select the mounting location
Choose a flat and rigid surface for mounting the intercom, ensuring it can support the weight of the unit.
- 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.
- 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.
- 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.
- Verify connections
Use a multimeter to check all connections for continuity and ensure there are no short circuits before powering on the unit.
- 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.
- 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.


