IDI-xx ISA Isolated Digital Input Cards
16, 32, or 48-channel isolated digital input ISA cards
FEATURES
- 16, 32, or 48 individually optically isolated digital inputs on the ISA bus
- 28 V maximum input models (A) and 60 V maximum input models (B)
- Polarity-protected inputs and 60 Vrms channel-to-channel and channel-to-computer isolation
- Change-of-state interrupts and periodic scanning on C-suffix models
- On-card ribbon-cable headers with cable strain relief
- Full-length card with on-card shields to help prevent accidental contact with field voltages
- Designed and manufactured in the USA
Price range: $178.00 through $676.00
In StockDescription
The IDI-xx family provides 16, 32, or 48 individually optically isolated digital inputs for ISA-bus computers. Differential inputs accept field signals up to 28 V or 60 V, depending on the model, with protection against accidental reversal of the input connections.
Channel-to-channel and channel-to-computer isolation helps eliminate ground loops in factory automation, energy management, security, and process monitoring applications. The 16- and 32-input models are depopulated versions of the 48-input card.
Choose the Input Configuration
Select the input count and voltage range required for your application. The A suffix identifies models with a maximum input voltage of 28 V; the B suffix identifies models with a maximum input voltage of 60 V. Models with a C suffix add change-of-state interrupt capability.
Change-of-State Detection
C-suffix models can generate a latched interrupt when one or more enabled input bits change state. Application software can respond by reading the inputs, signaling an alarm, or scanning other I/O points, reducing the need for continuous polling.
An on-board microcontroller supports enabling input groups and change-of-state detection in 16-channel blocks, subject to the channels populated on the selected model. Periodic scanning of active inputs can run concurrently with change-of-state operation to help verify system operation even when input states remain unchanged. Jumper-selectable interrupt levels are IRQ 2–7, 10–12, and 14–15.
Installation and Connections
Input wiring connects through on-card ribbon-cable headers. A tie-down bar provides cable strain relief, and on-card shields help prevent accidental contact with field voltages. The 13.310-inch-long board requires a full-size ISA slot.
For electrically noisy installations, optional ZTR-xx shielded protective cable jackets are described in the legacy ordering information. The jacket combines a high-temperature PVC outer layer with an aluminum foil/polyester shield and a groundable tinned-copper braid.
Modified-COTS (MCOTS) Customization
ACCES can tailor any standard product to your precise requirements — electrical, mechanical, firmware, environmental, or connector-level. Common MCOTS options include alternate I/O ranges, isolation enhancements, firmware changes, private labeling, conformal coating, extended temperature operation, ruggedized enclosures, and military-grade components. If this product is close but not a perfect fit, our engineering team can deliver a rapid-turn MCOTS variant with minimal NRE and dependable, Made-in-USA quality.
Digital Inputs
| Bus | ISA |
|---|---|
| Input count | 16, 32, or 48, depending on model; groups of 16 |
| Logic 0 | Open circuit or 1.5 VDC maximum |
| Logic 1 — 28 V models | 3.5 V minimum at 0.6 mA; 28 V maximum at 13 mA |
| Logic 1 — 60 V models | 2.4 V minimum at 2.0 mA; 60 V maximum at 2.3 mA |
| Frequency response | 28 V models: up to 5 kHz; 60 V models: up to 10 kHz |
| Isolation | 60 Vrms channel-to-channel and channel-to-computer, as specified on the legacy product page |
| Input protection | Accidental input-polarity reversal protection |
| Change-of-state interrupts | C-suffix models only; jumper-selectable IRQ 2–7, 10–12, and 14–15 |
Environmental and Mechanical
| Operating temperature | 0 to +60 °C |
|---|---|
| Storage temperature | −20 to +100 °C |
| Relative humidity | 0–90%, non-condensing |
| Board length | 13.310 inches; full-size ISA slot required |
| Power requirement | +5 VDC at 300 mA typical for the fully populated 48-input card |
| Regulatory compliance | Legacy product page states CE compliance |
Select 16, 32, or 48 inputs. A models accept inputs up to 28 V; B models accept inputs up to 60 V. Add the C suffix for change-of-state interrupt capability and periodic scanning.
| Model | Description | Price (USD) | |
|---|---|---|---|
| IDI-16A | 16-channel isolated digital input ISA card, 28 V maximum input, without change-of-state interrupts | $178.00 | |
| IDI-16AC | 16-channel isolated digital input ISA card, 28 V maximum input, with change-of-state interrupts | $298.00 | |
| IDI-16B | 16-channel isolated digital input ISA card, 60 V maximum input, without change-of-state interrupts | $208.00 | |
| IDI-16BC | 16-channel isolated digital input ISA card, 60 V maximum input, with change-of-state interrupts | $328.00 | |
| IDI-32A | 32-channel isolated digital input ISA card, 28 V maximum input, without change-of-state interrupts | $298.00 | |
| IDI-32AC | 32-channel isolated digital input ISA card, 28 V maximum input, with change-of-state interrupts | $430.00 | |
| IDI-32B | 32-channel isolated digital input ISA card, 60 V maximum input, without change-of-state interrupts | $358.00 | |
| IDI-32BC | 32-channel isolated digital input ISA card, 60 V maximum input, with change-of-state interrupts | $490.00 | |
| IDI-48A | 48-channel isolated digital input ISA card, 28 V maximum input, without change-of-state interrupts | $418.00 | |
| IDI-48AC | 48-channel isolated digital input ISA card, 28 V maximum input, with change-of-state interrupts | $574.00 | |
| IDI-48B | 48-channel isolated digital input ISA card, 60 V maximum input, without change-of-state interrupts | $508.00 | |
| IDI-48BC | 48-channel isolated digital input ISA card, 60 V maximum input, with change-of-state interrupts | $676.00 |
Compatible Accessories
- STA-50 — Screw-terminal assembly with two 50-pin headers and breadboard area
- STB-50 — Screw-terminal board for a 50-pin header connection
- STA-112 — Screw-terminal assembly with 25-, 37-, and 50-pin headers and breadboard area
- CAB50F-6 — 6-foot ribbon cable with 50-pin female connectors at both ends
- CAB50F-XX — Ribbon cable with 50-pin female connectors at both ends; specify length when ordering
- ZTR-xx — Optional shielded protective ribbon-cable jacket; specify required configuration