Industrial ACCES 104-IIRO-8E Relay Output Module

The ACCES 104-IIRO-8E is a PC/104 isolated input and relay output card that combines eight opto-isolated inputs with eight Form C relay outputs on a single 50‑pin PC/104 header, delivering 24 channels of I/O for compact embedded control. The standard 104-IIRO-8 supports change-of-state detection (COS) and IRQs, while the Economy 104-IIRO-8E omits COS/IRQ functionality to reduce cost; both models provide eight relay outputs and eight inputs in a single module. Each input accommodates 3 V to 31 V (DC or AC RMS, 40–10 kHz) with an input impedance of 1.8 kΩ and an independently selectable per-channel AC input filter, while the eight outputs are SPDT Form C relays rated to 1 A max at 24 V DC (60 V DC max) or 0.5 A max at 125 VAC. The contacts are silver alloy with gold-clad plating, with optional bifurcated contacts, and the I/O is opto-isolated from the PC/104 bus for up to 500 V of isolation. Power for the board is +5 VDC at approximately 400 mA when all relays are energized. Timings include a 10 μs response without filtering and 4.7 ms with the input filter enabled, plus a relay life of at least 5,000,000 operations; operating temperature ranges from –30 to 70°C (non-icing). I/O is accessed via a 50-pin header, and the module is designed for PC/104-based automation, data acquisition, and remote monitoring tasks where isolated digital inputs and reliable Form C relay control are required.