DL205 Analog I/O Manual, 7th Edition Rev. D
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Chapter 1: Getting Started
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Analog Output Module Terminology
Channels per Module - The total number of analog signals the module sends to field devices.
Output Ranges - The minimum to maximum spans in voltage or current the module outputs,
converted from digital values.
Resolution - The number of binary weighted bits available on the digital side of the module for
use in converting the digital value to an analog signal.
Output Current - The maximum current the module will drive using a voltage output signal.
Output Impedance - The output impedance of the module using a voltage output signal.
Load Impedance - The minimum and maximum resistance the module can drive, specified for
current and voltage output signals.
PLC Update Rate - The speed at which digital values in the PLC are converted to analog
output signals.
Linearity Error - The relative accuracy of the digital representation over the entire output
range.
Maximum Inaccuracy - Maximum absolute error of the digital representation of the signal over
the entire output range. Factors which contribute to maximum inaccuracy are also specified
separately. These factors are full-scale calibration error, offset calibration error, and accuracy
vs temperature.
Accuracy vs. Temperature - The variations in the module’s conversion accuracy with
temperature over the module’s operating temperature range.
External Power - All output modules contain circuitry which is optically isolated from PLC-
side logic. That circuitry requires field-side power from a separate 24VDC power source. The
24VDC output supply at the local base can be used as long as you do not exceed the current
ratings.
Base Power Required - The amount of base current required by the module. Use this value in
your power budget calculations.
Operating Temperature - The minimum and maximum temperatures the module will operate
within.
Relative Humidity -The range of air humidity over which the module will operate properly.
I/O Points Required - The number of I/O points the CPU must dedicate to the module.
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