Relay Output / Isolated Input Module for PC/104 Bus
The RELAYIO-104 is an 8-bit digital I/O peripheral module offering electrical isolation between the host and externally connected devices. It conforms to the PC/104 standard and operates on a single +5V power supply. A 40-pin IDC ribbon connector is used for all external wiring.
Eight SPDT (form C) relays are used for the digital outputs. Independent access to each relay's Normally-Closed, Normally-Open and Common terminals eases wiring constraints and permits flexible mixing of AC and DC signals. Each output is capable of controlling loads up to 1A @ 24Vdc or 0.5A @ 125VRMS. They also feature Break-Before-Make operation.
An 8-bit output register controls the state of the eight relays. By default, all relays are in a de-activated ( Normally-Closed ) state during power-off and system reset. A relay is activated by writing a "1" to its corresponding bit within the output register. Writing a bit as "0" de-activates the corresponding relay. The register is both readable and writable facilitating efficient Read-Modify-Write bit manipulations software techniques to be used.
Optically Isolated Digital Inputs
Eight separate inputs using non-polarized optical isolators allow any combination of DC or AC signals to be monitored. Their wide input voltage range (3-24V) is suitable for a diverse range of applications. Each input has an associated low-pass filter that can be individually enabled for the reliable measurement of AC signals. The filter is especially helpful when monitoring noisy DC signals.
The on/off states of the inputs are held in an 8-bit read-only register. An activated input appears as a "1" in its corresponding bit position.
Digital Input #0 has the added capability of optionally generating a host interrupt the moment it becomes activated. The event is latched in an interrupt status register so that even a short duration event will not go unrecognized. Applications which do not need full interrupt capability can still use this function by simply polling the interrupt status register.
- Eight SPDT (form C) relay outputs
- Eight optically isolated AC/DC digital inputs
- All inputs and outputs are electricaly isolated from each other
- Individual input filters for reliable sensing of AC and noisy DC signals
- Interrupt feature catches momentary input events
- 500V isolation between PC/104 bus and I/O signals
|I/O Connections:||40 Position IDC type header|
|Isolation:||All I/O: 500V DC or AC, input-to-board or board-to-output Isolation between I/O signals: 100V maximum|
|Addressing:||8-bit PC/104 bus. Occupies any consecutive 4-byte block in host's I/O map, 0x00016 through 0x3fc16|
|Power Requirement:||+5Vdc ±5% @ 80mA typical. Additional 30ma required for each activated relay|
|Dimensions:||PC/104 compliant, 3.55"W x 3.775"L. 8-bit stack-through, optional 16-bit stack-through|
|Environmental:||Operating temperature: -20°C to 70°C|
Non-condensing relative humidity: 5% to 95%
|Product Origin:||Designed, Engineered, and Assembled in U.S.A. by SCIDYNE Corporation using domestic and foreign components.|
|General:||Eight SPDT (Form C) sealed electromechanical relays, Break-Before-Make operation|
|Power Handling:||DC: 1 Ampere @ 30Vdc maximum|
AC: 0.5 Ampere @ 125VRMS maximum (resistive load)
|Switching Capacity:||1ma, 5Vdc minimum, 62.50 VA, 30W maximum|
|Contact Resistance:||100mΩ maximum, Ag (Au clad) contacts|
|Operate Time:||5ms maximum (activate or release)|
|Service Life:||5 x 106 operations minimum|
|General:||Eight independent non-polarized optically isolated inputs|
|Input Voltages:||DC: 3V minimum, 24V maximum, non-polarized|
AC: 3VPP minimum, 24VPP maximum, 40hz to 1khz
|Switching Time:||Typical @ 5V, Filter Disabled: On: 40μs Off: 100μs|
Filter Enabled: On: 20ms Off: 85ms
|Input Impedence:||1.8kΩ minimum|
|AC Input Filter:||RC type low-pass. Selectable on a per input basis|
|Interrupt:||One interrupt, Jumper selectable IRQ 3,4,5,6,7 9 (10,11,12,14,15)* or Disable. Fully supports sharing. Associated with digital input #0 activation, positive edge sensitive. * Optional 20-Position J2/P2 stack-through connector required for upper IRQs.|