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Diamond Systems PMM-P

16-Channel SPDT (Form C) Relay Output PC/104 Module

Things Embedded are an official Diamond Systems USA distributor and can supply the PEARL-MM.


Digital I/O


Diamond Systems


Pearl-MM is a PC/104 format industrial control module with 16 relays. The relays have PDT (form C) configuration. Each relay has 3 contacts: Common, Normally Open, and Normally Closed. For safety and reliability, all relays are in their power-off state (Common connected to Normally Closed) at power-up or system reset. The relays can switch both AC and DC voltages. They feature long life (100,000,000 operations), quick actuation time (4ms max operate and release), and isolation (500V AC or DC).

I/O Headers

C = Common>

NC = Normally Closed (connected to Common when relay is not energized)

NO = Normally Open (connected to Common when relay is energized)

Pearl-MM is programmed using two 8-bit I/O registers. Each bit controls one relay. Writing a 1 to a bit turns the relay on, while writing a 0 turns the relay off. On power-up or reset, all bits are 0, and all relays are off (C connected to NC).


Brand & Model Diamond Systems PMM-P
16-Channel SPDT (Form C) Relay Output PC/104 Module
Features Compact
No. of Outputs 16
Relay type SPDT (Form C)
Max voltage/current DC: 0VDC/2A 60W (DC), 60VA (AC)
AC: 125VAC/0.5A resistive
Max switching capacity 220VDC, 250VAC
Max operating voltage 10mA@10mVDC
Contact resistance 100mΩ max
Relay lifetime 100,000,000 operations
Actuation time 4ms max operate or release
I/O connections 50-position (2×20) .025” square pin header on .1” centers
Isolation (all I/O) 500VDC or AC, channel-to-channel and channel-to-board
Power supply +5VDC ±10%
Operating temperature -40°C to +85°C
Operating humidity 5% to 95% non-condensing
Weight 3.4oz / 96g
MTBF 118,227 hours
RoHS Compliant

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