104-IIRO-8 / 104-IIRO-8E Модуль PC/104 c 8 оптоизолированными и 8 обычными цифровыми входами, 8 релейными выходами

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104-IIRO-8 & 104-IIRO-8E

FEATURES

8 optically-isolated, non-polarized CMOS compatible digital inputs accept ±31VDC or AC rms
IRQ on input change of state (COS) eliminates the need for constant polling
Slow/fast filter to accommodate AC voltages and noisy DC inputs
8 Form C electro-mechanical relays switch up to 1A each
8 non-isolated TTL compatible inputs

FUNCTIONAL DESCRIPTION

The 104-IIRO-8 is a low cost 24-channel PC/104 utility board featuring eight optically isolated digital inputs with Change of State (COS) detection, eight TTL inputs and eight electromechanical Form C SPDT relay outputs. The isolated, non-polarized inputs may be driven by either DC sources of 3-31V (or higher by special order) or AC sources at frequencies of 40Hz to 10KHz. Optically isolating the digital inputs from each other, and from the computer, assures smooth, error-free data transmission in noisy, real-world environments.
Eight buffered general-purpose TTL inputs, useful for reading dry contact closures or any TTL-compatible outputs, are also provided. The eight electromechanical relays are de-energized at system power-up to prevent an unintended control output signal. Data to the relays are latched. The 24-channels are available via one 50-pin IDC type header.
Each input circuit includes a jumper selectable slow/fast filter to accommodate AC inputs and is also useful for slow DC inputs in noisy environments. The filter may be manually disabled to increase the board’s typical response time to 10 µsec when used with faster DC inputs. All input signals are rectified by diodes before input to the opto-isolators. Current limiting is provided by a 1.8K Ohm, 1/2-Watt resistor in series and accommodates a wide input range.
The board is installed by jumper selecting the base address and IRQ. System interrupts are software controlled, enabling the board to generate an interrupt whenever one or more of the isolated digital inputs changes state. Once an interrupt has been generated and serviced, the board’s inputs are read to determine their status, then the interrupt is cleared by system software. This eliminates the need for constant polling and greatly frees up system resources. Model 104-IIRO-8E is an economy version available without the interrupt Change of State Detection feature.

Ordering Information
Part# Description

Unit
104-IIRO-8 24-channel opto-isolated input/relay output with change of state detection
104-IIRO-8E Economy version without change of state feature