There are no jumpers or physical settings required inside the device. Any configuration switching that needs to be done is handled by solid state switches. Configuration of all I/O is done through web pages found under the I/O Devices setup tabs illustrated above. Configuration of universal analog inputs is illustrated below.

Configure an Analog Input for temperature by selecting the appropriate thermistor type. Configure 0-10V input by selecting 0-10V, and entering a slope and intercept that corresponds to your sensor. If using a 4-20mA sensor, you will need a dropping resistor connected in parallel across the sensor input. If you wish to use an input as a simple on/off input, select discrete or dry contact.

A calibration helper page is built in. Simply enter data from readings you have taken, or data from the sensor spec sheet, then enter the desired display range. The helper will calculate slope and intercept for you. It will even take resistor values into account when a dropping resistor is used. Simply click on the calibration helper link at the top of the Analog Inputs configuration page.

The difference between discrete and dry contact is this: With a discrete input, it is expecting you to provide external voltage excitation (up to 24VDC). With a dry contact input, it provides its own excitation, and you simply provide a contact closure to ground.

The first 16 inputs of AddMe III are fully configurable as shown above. Inputs 17 and 18 are restricted to 0-10V only (or 4-20mA with dropping resistor).

Analog Outputs only require a slope and intercept setting. This allows the output to be scaled to engineering units.

Discrete Inputs may be set to function as (1) state input, (2) frequency input, or (3) total count input. When configured for frequency, the slope and intercept will be used to scale an input to engineering units. A common requirement for this is converting tachometer input to RPM. Total count mode creates a totalizing input, and the counts are maintained through power loss.

Discrete Outputs have an optional timer associated with them. The timer can do one of two things: (1) generate a pulsed output, or (2) impose a minimum on time qualification to prevent rapid cycling.