ION 7500 / ION 7600 User’s Guide

Setting Analog Zero and Full Scale Values

 

 

Detailed Operation

The following illustration shows the operation of a Analog Output module. The Source input falls between the Zero Scale and Full Scale values. It is scaled and the result is then sent to the specified hardware port. (The port is specified in the Port setup register.) The Normalized output register provides information about the state of the hardware: the output on the hardware port in this instance is at 83%.

If at any point the input rises above the value specified in the Full Scale setup register, the output remains at the Full Scale value and the maximum possible value is sent to the hardware port. Likewise, if the input falls below the value specified in the Zero Scale register, the output remains at the Zero Scale value and the lowest possible value is sent to the hardware port. If the input becomes NOT AVAILABLE, the Normalized output register is also NOT AVAILABLE and the lowest possible value is sent to the hardware port.

Setting Analog Zero and Full Scale Values

You control or monitor external analog devices by delivering or receiving a specific current or voltage that is proportional to a source. This is done by setting the Full Scale and Zero Scale setup registers and defining the hardware port that receives (Input) or delivers (Output) current. Use Designer software to configure the setup registers in the Analog Input or Output modules.

When scaling values to current, the Full Scale value is always set to the highest value you expect. The Zero Scale value depends on the actual current that drives the input/output and the type of information that the current represents. The following information steps through scaling an Analog Output module that receives kW as a source and passes the kW value to an analog device whose range is different than the range for the ION analog output.

NOTE

The general behavior of Full Scale and Zero Scale is such that: if the input rises above the Full Scale value, the output remains at the Full Scale value and the maximum possible value is sent to the hardware port. Likewise, if the input falls below the Zero Scale value, the output remains at the Zero Scale value and the lowest possible value is sent to the hardware port.

Digital and Analog I/O Technical Note

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Multi-Tech Systems 7500, 7600 manual Setting Analog Zero and Full Scale Values
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