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Diamond Point International

Tri-M IR104 - Digital I/O Opto-Isolated Module

20 Optoisolated Digital Inputs, 20 Relay Outputs


The IR104 is a PC104 rugged industrial relay module featuring 20 optoisolated digital inputs and 20 relay outputs, sufficient for many industrial control applications. Each input can accept either AC or DC voltages with a range of 3-24V and are accessed through a 40-pin header that mates with a standard ribbon cable. The 20 SPST (Form A) relays have a long lifetime (20,000,000 operations, 100,000 at full load) and quick actuation time (6ms max operate, 3ms release). The relays are supplied with a contact rating of 250VAC or 30VDC @ 5A giving the IR104 the ability to directly control switches for small motors or solenoids. The relays are in the open state when deactivated / powered off.

To allow for quick and convenient installation, a pair of 20-position detachable terminal blocks accept wire sizes of 14-28AWG. The IR104 is a compact design measuring 3.550" x 3.775" with a maximum component eight of 0.492". A 16-bit PC/104 BUS is included to allow for easy integration into embedded systems or to allow for up to 4 IR104 modules to be stacked together.

The IR104 operates on single 5VDC, has a -25° to +70°C operating temperature range and is now RoHS compliant.


  • Output rating 5 amperes @ 250VAC or 30VDC
  • 3V to 24V Ac or Dc input
  • I/O mapped
  • All inputs are optoisolated
  • 20 optoisolated input and 20 output relays
  • Rugged design


Digital I/O/Counter/Timers

I/Os20 optoisolated inputs
20 reley outputs
InputsBi-directional 3kV Protection
3V to 24V AC or DC
Outputs5A @ 30VDC or 250VAC max
20,000,000 lifetime cycles
Operate 10ms max
Release 5ms max
IsolationAll inputs are optoisolated (to 3kV)
OtherI/O Map: Relay Output Control, Digital Input Reading, Input Change Flags, RoHS Interrupt Control Register


ExpansionStandard 16 bit PC/104 interface
ElectricalSupply Voltage +5VDC
Supply Current 1A max, Typ.110mA (all relays off)
MechanicalDimensions: 90 × 96 × 23mm, (3.55 × 3.78 × 0.49")
Conformal CoatingOn request
TemperatureTemperature range (operation): -25°C to +70°C (-13°F to +158°F)
Temperature range (storage): -25°C to +70°C (-13°F to +158°F)
Humidity0-90% non-condensing
Weight127.12g (4.48oz)
MTBF57,098 Hours @ 30°C (86°F) ambient temperature
Warranty1 Year

Ordering Details

BoardIR104-PBF PC/104, 20 Optoisolated Inputs and 20 Relay Outputs, (-25 to +70°C)

-CH Add suffix for Humiseal conformal coating and epoxy (factory installed)
-CS Add suffix for Silicon conformal coating and epoxy (factory installed)
-CU Add suffix for Urethane conformal coating and epoxy (factory installed)
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