SIO-1000 Applications Examples

The following examples show how to make connections to the various input and output signals on the SIO-1000:

• Reading switches with the digital inputs
• Reading potentiometers with the analog inputs
• Counting switch closures with the pulse counter input

• Driving an external relay with a digital output
• Driving LED's with the digital outputs
• Driving a voltmeter with an analog output
• Driving a speaker with the waveform output signal

• Operating a warning light or annunciator with the on-board relay

• Connecting the digital inputs and outputs to an I/O module mounting board

• Powering the SIO-1000 with DC through the terminal blocks
• Powering the SIO-1000 with AC through the terminal blocks

Reading switches with the digital inputs

Up to 6 switches can be connected to the digital input signals DI0 through DI5 at the terminal block connectors. The digital inputs have on-board 4.7K pull-up resistors to +5 volts so external pull-up resistors are unnecessary. (It can't get much simpler than that, can it?)

The other 2 digital input signals, DI6 and DI7, are available only on the RACKIO connector.

Reading potentiometers with the analog inputs

Voltage sources from 0 to +5 volts can be connected to the analog input signals AI0 and AI1 at the terminal block connectors. Potentiometers can be easily read by using the +5 available on the SIO-1000 to "power" the pots, but the current used should be less than 100 milliamperes. Using pots that are 1000 ohms or greater is recommended.

Counting switch closures with the pulse counter input

A switch or relay can be connected to the pulse counter input signal at the terminal block connectors to count switch or relay closures. The pulse counter input has an on-board 4.7K pull-up resistor to +5 volts so external pull-up resistors are unnecessary.

The "pulse counter input filter" jumper should be placed in the "filtered" position so that the switch "bounce" is filtered out.

Driving an external relay with a digital output

An external relay can be activated with one of the digital outputs DO0 through DO3 at the terminal block connectors. The digital outputs have open collector transistors that can switch to ground the current to operate a relay or other low voltage device. Current to operate the relays can be obtained from the +12 available at the terminal block connector, but the current used for this purpose should be less than 100 milliamperes total for all of the relays. If the relays require more current than this, a separate power supply should be used.

The other 4 digital output signals, DO4 and DO7, are available only on the RACKIO connector.

Driving LED's with the digital outputs

Light emitting diodes can be activated with the digital outputs DO0 through DO3 at the terminal block connectors. The digital outputs have open collector transistors that can switch the LED current to ground, and current to operate the LED's can be obtained from the +12 or +5 available at the terminal block connector. (The LED's must have series resistors to limit the current to that specified for the particular LED.)

The other 4 digital output signals, DO4 and DO7, are available only on the RACKIO connector.

Driving a voltmeter with an analog output

An analog voltmeter or a digital panel meter can be driven with an analog output to provide a variety of displays of a voltage signal.

An inexpensice digital panel meter can be setup in a variety of ways to provide a general purpose numerical display with 2 and one half numerical digits. These digits could be used to display not only voltage, but with the decimal point disabled, could display percentages and other values.

Driving a speaker with the waveform output

A speaker can be driven with the waveform output at the terminal block connector. The waveform output has an open collector transistor that can switch the speaker current to ground to produce sound when used with the waveform output commands. Current to operate the speaker can be obtained from the +12 or +5 available at the terminal block connector, but the current switched through the speaker should be limited with a series resistor.

The "waveform output polarity" jumper should be placed in the "low going waveform" position so that speaker current is switched on only when the waveform is being produced.

Operating an warning light or annunciator with the on-board low voltage relay

The on-board relay on the SIO-1000 should be used only for low voltage switching.

Since the +12 and +5 available at the terminal block connectors is limited to 100 milliamperes, most warning lights or annunciators will need to be operated with a separate power supply.

Connecting the digital inputs and outputs to an I/O module mounting board

The digital inputs and outputs can be easily connected to industry standard I/O module ("brick") mounting boards using the "RACKIO" connector. This connector will mate with common industry standard interface ribbon cables available from the manufacturers of the mounting boards. The mating connector is a 50 pin (2 row by 25 pin) female IDC header connector.

The +5 needed to operate the LED's on an I/O mounting board can be obtained from the SIO-1000, either by wiring the connections discretely, or using the connection in the ribbon cable.

Digital input signals DI0 through DI5 and digital output signals DO0 through DO3 are also available on the terminal block connections.

Powering the SIO-1000 with DC power through the terminal blocks

If you do not wish to use a wall-block transformer to power the SIO-1000, a separate 15 to 18 volt DC supplying 100 MA or more, regulated or unregulated power supply can be used to power the unit through the terminal block connections.

Powering the SIO-1000 in this manner gives you the advantage of having higher current available for connection to external devices, since the maximum current that should be drawn from the +12 connection at the terminal blocks is 100 mA.

Powering the SIO-1000 with AC power through the terminal blocks

If you do not wish to use a wall-block transformer to power the SIO-1000, a separate 12 to 13 volt AC at 100 mA or more power supply can be used to power the unit through the terminal block connections. A common 12.6VAC transformer is a suitable source of power.

Powering the SIO-1000 in this manner gives you the advantage of having an AC voltage source available for connection to external devices.

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