A24A Solid State Module Card Family


  • Industry standard, opto-isolated digital I/O modules
  • Choice of AC or DC inputs or outputs
  • Screw terminals for easy interface to field wiring
  • Edge connectors for interface to digital I/O cards via ribbon cable
  • 4000V optical isolation
  • Slim design to save space
  • Alumina substrate provides superior heat dissipation


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Solid-State I/O Modules and Cards

The solid-state relay I/O modules are used as power control and voltage monitoring interfaces between high level DC or AC lines and TTL logic levels. The modules are in a slim, space-saving form. Four functions are offered: DC Input, DC Output, AC Input, and AC Output.

The A24A can hold up to 24 modules. Field-side terminations are provided via convenient terminal strips with points isolated from each other. The logic side has a common logic supply bus with screw terminals for input power connections. Logic-side connections are via a 50-conductor edge connector.


Any of ACCES’ buffered digital I/O cards (IOD-24, IOD-48S, IOD-72, or IOD-120) may be used and one 24-bit port will be used per A24A. Various combinations of I/O modules can be intermixed on one A24A mounting card. However, each contiguous group of eight channels must contain only input or output modules. If more than 24 I/O modules are required, additional 24-bit ports may be necessary.

In some cases, logic power required can exceed the current handling capability of digital I/O cards. For these instances, an external 5 VDC power supply is recommended. Screw terminals are provided on the card for those power supply connections in addition to a jumper next to the terminal strips that should be cut.


See the specifications tab for available modules.

Last updated on September 13th, 2021


Data Sheets

Drivers and Downloads

Full list of available Downloads: Software Packages, Drivers, Manuals, and other documents

Information about our Free Software packages:

ACCES is proud to provide a full suite of software support with every Data Acquisition product. We are committed to supporting the most popular operating systems and platforms for our customers. Currently we are actively supporting XP -> 10, both 32 & 64 bit, including “Server 2008,” “Embedded,” and “Compact” flavors for all plug-and-play products including PCI, PCI Express, USB, and more. Many products continue to ship with support for additional operating systems such as DOS, Windows 95, 98, Me, NT4, and 2000.


Among the software we deliver with our products are sample programs in a wide variety of programming languages. These samples are used to demonstrate the software interfaces to our products — and many can be used as-is in your production environments, or to test functionality of the devices out-of-the-box. We’re currently actively supporting sample programs in Microsoft Visual C#, Visual Basic, Delphi, and Visual C/C++, with many devices including samples in Borland C/C++ 3.1 for DOS. Additionally we provide National Instruments LabVIEW compatible DLLs and many demonstration VIs for our devices.


Drivers for various operating systems are also provided, including active support for Windows XP -> 10 — all in both 32-bit and 64-bit flavors, and including consumer, server, and embedded varieties — as well as the 2.6 and newer Linux kernels and recent OSX / macOS versions. Many products continue to ship with driver support for Windows 95, 98, Me, NT4, and Windows 2000, but support for these operating systems is considered deprecated.

Setup Programs and Utilites

Our Data Acquisition devices also include a graphical setup utility that walks you through the process of configuring any option jumpers or switches on the device, as well as explaining a little about the various connectors present.

Many devices also include utility programs – little tools to make your use of the device easier, such as EWriter, a program that allows you to read and write data in the user-accessible EEPROM locations on all our USB data acquisitition products; or WinRISC, a “Really Incredibly Simple Communications” terminal program that lets you get started instantly with serial devices.

“Register Level” Documentation

Besides all this software in all these languages and operating systems ACCES has a policy of open and transparent development: none of our lowest-level “register” interfaces are hidden from you — we document every register in every bus card, every command in every serial board, and every usb control transfer in every USB Data Acquisition board. These lowest-level interfaces allow you to develop for our products in ANY operating system or language, regardless of our actively supporting it or having a driver for it. We have customers actively developing in ADA, Android, Python, Java, MATLAB, Solaris, and more, just by referring to our complete low-level interface documentation! And we provide the full source code to all of our drivers, regardless of operating system, to give you an even bigger head start in your own development tasks.

No Fees or Royalties

All of this software is provided at no additional charge, and is licensed under any of a variety of flexible — and royalty free — options. Check out our software license explanation if you’d like more information.

Last updated on October 11th, 2021

Custom Software

ACCES also offers Custom Software Services for our products. Our prices are unbelievably low, often as inexpensive as free! If you need something tweaked to support your needs, or an entire enterprise application developed from scratch, it is definitely worth your time to inquire with us, first.

Further information about available ACCES Software:

Redistributing Windows Drivers
A list of ACCES drivers and the files that compose them under different versions of Windows, so you can easily redistribute ACCES cards and drivers.

Last updated on October 11th, 2021


  • Operating Temperature Range: -30° to +80°C.
  • Storage Temperature Range: -40° to +100°C.
  • Isolation: 4000 V.
  • Input-to-Output Capacitance: 8pF.
  • Mounting Card Dimensions: 14.05″ long x 3.50″ wide.
  • Module Dimensions: 1.70″ long x 0.43″ wide.

DC Input Modules

InputIB5S (IDC5B Type)IN5S¹ (IDC5 Type)
Input Voltage Range3.3 – 32 VDC10 – 60 VDC/AC rms
Input Resistance1 KWN/A
Max. Input Current²24 mA24 mA
Drop Out Current1.0 mA1.0 mA
Max. Offstate Voltage2.0 VDC2.0 VDC / VAC rms
OutputIB5S (IDC5B Type)IN5S¹ (IDC5 Type)
Logic Supply Voltage5.0 VDC5.0 VDC
Logic 0 Voltage Range (@ pin 3)1.5 – 6.0 VDC1.5 – 6.0 VDC
Typical Logic Supp. Current²10 mA10 mA
Max. Output Leakage Current³10 µA10 µA
Max. Turn-On Time300 µSec20 mSec
Max. Turn-Off Time600 µSec30 mSec


DC Output Modules

InputOB5S (ODC5 Type)OC5S (ODC5A Type)
Nominal Input Voltage5.0 VDC5.0 VDC
Input Voltage Range2.5 – 7.5 VDC2.5 – 7.5 VDC
Drop Out Voltages1.0 VDC1.0 VDC
Max. Input Current27 mA w/o LED27 mA w/o LED
Typical Input Current10 mA DC10 mA DC
Nominal Input Resistance240 W240 W
OutputOB5S (ODC5 Type)OC5S (ODC5A Type)
Max.Line Voltage60 VDC200 VDC
Min. Line Voltage3.0 VDC5.0 VDC
Max. Off State Voltage60 VDC200 VDC
Max. Off State Leakage1.0 mA DC2.0 mA DC
Max. On State Current3.0A DC41.0A DC5
Min. On State Current10 mA DC10 mA DC
Max 1-Second Surge5A DC5A DC
Peak On State Voltage @ 25°C1.5 VDC1.6 VDC
Max. Turn-On Time50 µSec50 µSec
Max. Turn-Off Time100 µSec100 µSec


AC/DC Input Modules

InputIA5S¹ (IAC5 Type)IM5S¹ (IAC5A Type)
Nominal Input Voltage120 Vrms / DC249 Vrms / DC
Input Voltage Range90 – 140 Vrms / DC180 – 280 Vrms / DC
Maximum Input Current³10 mA rms8 mA rms
Drop-Out Current2.5 mA rms1.5 mA rms
Max. Off-State Input3.0 mA rms2.0 mA rms
Max. Off-State Voltage50 Vrms / DC120V rms
OutputIA5S¹ (IAC5 Type)IM5S¹ (IAC5A Type)
Logic Supply Voltage5.0 VDC5.0 VDC
Logic 0 Voltage Range (@ pin 3)1.5 – 6.0 VDC1.5 – 6.0 VDC
Typical Logic Supp. Current²10 mA DC10 mA DC
Max. Logic Supp. Current³18.5 mA18.5 mA
Max. Logic Supp. Leakage³10 µA10 µA
Max. Output Voltage30 VDC30 VDC
Max. Output Current50 mA DC50 mA DC
Max. Output Leakage Current³10 µA10 µA
Max. Output Voltage Drop6200 mV200 mVDC


AC Output Modules

InputOA5S¹(OAC5 Type)OM5S (OAC5A Type)
Nominal Input Voltage5.0 VDC5.0 VDC
Input Voltage Range @ pin 32.5 – 7.5 VDC2.5 – 7.5 VDC
Drop-Out Voltage1.0 VDC1.0 VDC
Max. Input Current27 mA w/o LED27 mA w/o LED
Typical Input Current710 mA10 mA
Nominal Input Resistance240 W240 W
OutputOA5S¹(OAC5 Type)OM5S (OAC5A Type)
Nominal Line Voltage120 Vrms240 Vrms
Line Voltage Range12 – 140 Vrms24 – 280 Vrms
Max. Peak Off-State Voltage400 V600 V
Max. Off-State Leakage2.5 mA rms4.5 mA rms
Static Off-State (dv/dt)200 V/µSec200 V/µSec
Max. On-State Current43.0A rms3.0A rms
Min. On-State Current50 mA rms50 mA rms
Max. 1-Cycle Surge100A peak100A peak
Peak On-State Voltage1.6V peak1.6V peak


1. Can be used with either DC or AC inputs.
2. At nominal voltage with LED on board.
3. At maximum logic voltage.
4. Derate 33 mA/°C above 25°C.
5. Derate 20 mA/°C above 60°C.
6. At maximum output current.
7. LED in series w/nominal voltage.
Regulatory Compliance 
Declaration of Conformity, and Test Reports are on file. Users must use appropriate shielded cables.

Please note, prices below require a minimum order quantity of 10 pieces, please call for all other quantities.

ModelDescriptionPrice (USD)

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