# CIO-EXP Series

The CIO-EXP Series includes the following hardware:

- CIO-EXP16
- CIO-EXP32
- CIO-EXP-BRIDGE
- CIO-EXP-GP
- CIO-EXP-RTD

The CIO-EXP Series supports the following UL and UL for .NET features.

## Temperature input

Functions

UL: cbTIn(), cbTInScan()

UL for .NET: TIn(), TInScan()

Scale

CELSIUS, FAHRENHEIT, KELVIN

HighChan

From 16 up to 255 for 16-channel boards, and from 64 up to 303 for 64-channel boards. The value depends on the number of boards connected and the application.

## Hardware considerations

CIO-EXP boards are used only in combination with an A/D board. Channel numbers for accessing the expansion boards begin at 16 for 8-channel and 16-channel boards, and 64 for 64-channel boards. To calculate the channel number (Chan) for access to CIO-EXP channels, use the following formula:

Chan = (ADChan * 16) + (16 + MuxChan)

MuxChan is a number ranging from 0 to 15 that specifies the channel number on a particular bank of the expansion board. An EXP32 has two banks, so the channel numbers for one EXP32 connected to an A/D board would range from 16 to 47.

If all A/D channels are not used for CIO-EXP output, direct input to the A/D board is still available at these channels (using channel numbers below 16).

When CIO-EXP boards are used for temperature input, set the gain of the A/D board to a specific range:

- When using A/D boards with programmable gain, the range is set by the Universal Library.
- When using boards with switch-selectable gains, set the gain to a range that is dependent on the temperature sensor in use.
- Generally, thermocouple measurements require the A/D board to be set to 5 V bipolar, if available, or 10 V bipolar if not. RTD sensors require a setting of 10 V unipolar, if available. These checks are made when you configure the system for temperature measurement using InstaCal.