M.2 8-ch Isolated Digital Input and Relay Output with Change-of-State (COS)

  • Description
  • Specifications
  • Ordering Guide

The M.2-IIRO-8 is 2260/2280 sized M.2 Card designed to be easily panel-mounted in any application environment. It uses the high speed PCI Express bus to transfer digital data to and from the card. The digital I/O is compatible with 8255 PPI chips making it easy to program.

The M.2-IIRO cards are well suited to complex environments, mitigating otherwise challenging ground-loops, high-common-mode, and transient voltage spikes common in electrically-noisy industrial or factory locations. The broad voltage compatibility and high current outputs allows use in a wide range of applications.

The non-polarized inputs support both AC and DC, and configuration jumpers allow 4.7ms input filters to be enabled per-channel, as desired – required for AC use. The isolated inputs support voltages from 3 to 31 VDC/VAC RMS [40Hz to 10000Hz], as well as standard 12/24 AC control transformer signals.

Outputs are 5 Form C (“Single-pole, double-throw”, or SPDT) and 3 Form A (SPST) electromechanical relays capable of 1A continuous-current load.

Change of State (COS) detection and interrupt capabilities are designed to relieve software from polling routines that can consume valuable processing time. Each port can be programmed for detecting state changes on their lines, in which any changes of the enabled port’s bits (low-to-high or high-to-low) will generate an IRQ. An ISR (interrupt service routine) then determines which bit changed state and clears the interrupt.

Interface M.2 2260/2280 with B & M key
Number of Isolated Inputs 8 or 4
Type Non-polarized
Optically isolated from each other and from the computer (CMOS compatible)
Voltage 3 to 31 DC or AC RMS (40 to 10000Hz)
Isolation 500V channel-to-ground and channel-to-channel
Resistance 1.8KΩ in series with opto-coupler
Filter Response Rise-time: 4.7 ms
Fall-time: 4.7 ms
Non-Filter Response Rise-time: 10 μs
Fall-time: 30 μs
Relay Outputs 8 or 4
Type 5 Form C (SPDT) and 3 Form A (SPST)
Ag with Au clad, single crossbar for M.2-IIRO-8
4 Form C for M.2-IIRO-4
AC Load 0.5A at 125 VAC (62.5 VA max)
DC Load 1A at 24 VDC (30W max)
Switching Voltage 125 VAC, 60 VDC, max
Switching Current 1A max
Contact Resistance 100 mΩ, max
Contact Life 5 million operations, min
Power Required +3.3VDC @ 730ma (typical), all relays on
Operating temperature 0°C to 70degC (standard)
-40ºC to +85ºC (Add -T)
Operating humidity 5% to 95% noncondensing
Weight 6.2g


Model Description
M.2-IIRO-8 M.2 8-ch Isolated Digital Input & Relay Output with Change-of-State (COS)
M.2-IIRO-4 M.2 4-ch Isolated Digital Input & Relay Output with Change-of-State (COS)
M.2-RO-8 M.2  8-ch Relay Output only
Option: -T -40ºC to +85ºC