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AI Analog Input Block |
Analog input (AI) blocks represent a physical analog input on the device.
| Parameter | Description |
| Name | Function block name, see common parameters |
| Units | Parameter's engineering units, see common parameters |
| Scale | Parameter's scale, see common parameters |
| Format | Parameter's format, see common parameters |
| Type | Type of input. Available options from the pull-down menu: - Thermistor 10K Type II - Thermistor 10K Type III - 0 - 5.0 Volts - 0 - FS counts (the measured value from the A/D chip is transferred directly without any scaling; the value will be 0 to 1023 counts for 0 to full scale of the A/D) |
| Lo | The engineering unit value that corresponds to the minimum input value. |
| Hi | The engineering unit value that corresponds to the maximum input value. |
| Filter | Selects the filter to be applied to the input. Moving the slider to the right increases the amount of filtering. Placing it at the far left turns filtering off entirely. |
Note that there are two special type of analog input blocks: Tint and PCL.
- Tint automatically appears on the programming page for devices with
an embedded temperature sensor. This analog input block represents the
internal temperature measurement. It is factory calibrated and this calibration is preserved across firmware updates. The calibration value
is accessible through the SYS blocks on the
programming page.
- PCL automatically shows on the programming page for devices with an
embedded photocell (measures ambient light, example: MBus_io12_LCD). This analog input block represents the
device's internal ambient light measurement. The photocell output is between 0
and 100 units, the zero value representing maximum obscurity and 100
representing maximum light.
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Internal Temperature Sensor |
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Internal Photocell |