IIRO-8
Eight Isolated Digital Inputs and Eight Relay Outputs
FEATURES
- Eight
optically isolated, non-polarized digital inputs
- Eight
electromechanical relay outputs
- 60V
isolation
- Can
detect input state change and assert interrupt
FUNCTIONAL
DESCRIPTION
IIRO-8
is a low-cost, half-size card that provides isolated input
and output interface for PC/XT/AT and compatible computers.
The card provides eight optically-isolated inputs for AC or
DC control signals and eight electromechanical relay outputs.
Inputs are optically isolated from each other and from the
computer. They can be driven by either AC or DC signals and
are not polarity sensitive. Thus inputs can be driven from
standard 12/24 VAC control transformers as well as by DC voltages.
Input voltage range is 5 to 24 Volts (rms). External resistors
connected in series can be used to extend this input range.
Each
input circuit contains a switchable slow/fast filter that
has a 10 millisecond time constant. The filter must be selected
for AC inputs but may be switched out in order to obtain faster
response for DC inputs. The filter is also useful for slowly-changing
noisy DC inputs. A DIP switch on the card permits filter selection
on a channel-by-channel basis. Alternatively, you can globally
switch all filters in or out under software control.
Another
feature of this card is the ability to detect if a state change
occurs at any one or more of the inputs and, in turn, assert
an interrupt. This is very useful when monitoring for
contact closures/openings because it is not necessary to continuously
poll the inputs. When the IIRO-8 detects a state change, the
resulting interrupt request can be used to initiate a poll
of the inputs to determine which line(s) changed. After the
interrupt has been serviced, the interrupt latch can be cleared
by a software write.
The
electromechanical relay outputs are comprised of five Form
C SPDT outputs and three Form A SPST (normally open) type.
On/Off status of the relays can be read back. All relays are
de-energized at power turn-on. IIRO-8 occupies four consecutive
addresses in I/O space. The base address can be selected anywhere
within the address range 000-3FF (hex). Read and write operations
are done on an 8-bit byte-oriented basis. All input/output
connections are via a single 37-pin D connector at the rear
of the card.
SPECIFICATIONS
Digital
Inputs
- Number
of inputs: 8
- Type:
Non-polarized, optically isolated from each other
and from the computer. (not TTL/CMOS compatible)
- Voltage
Range: 5 to 24V DC or AC (50 to 1000 Hz)
- Isolation:
60V channel-to-ground or channel-to-channel
- Input
Resistance: 470 ohms in series with two diodes and
an LED
- Response
Time: 20 mSec w/filter, 10 uSec w/o filter
Relay
Outputs
- Number
of outputs: 8
- Contact
Rating: 2A carry current, bifurcated, gold clad, silver
palladium
- Contact
Arrangement: Channels 0-4 are SPDT Form C and channels
5-7 are SPST Form A
- Contact
Rating: Initial 100 milliohms maximum
- Contact
Life: mech'l: 5 million operations minimum; elect'l:
500,000 operations minimum at full load
- Operating
Time: 2 milliseconds maximum
- Release
Time: 1 milliseconds maximum
Interrupts
When
enabled by software and by installation of level-select
jumpers, interrupts are generated when digital inputs
change state.
Power
Required
+5VDC
@ 1 A (all relays ON)
Environmental
- Ambient
Temperature: Operating: 0 to +50 C
- Storage:
-20 to +70 C
- Humidity:
0 to 90 percent (non-condensing)
- Weight:
Approx. 8 oz.
| Part
Number |
Price(USD)
|
| IIRO-8 |
190.00
|
View / Download Manual (in .PDF
format)
