What Is the Difference Between IL1R (Logic Input Real Image) and IL1I (Logic Input Physical Image) on Altivar Process Drives?
Resolution:
IL1I and IL1R represent two different states of the drive's logic inputs:
- IL1I (Logic Input Physical Image): Represents the actual physical state of the logic input terminals.
- IL1R (Logic Input Real Image): Represents the logic input state used internally by the drive after any configured logic inversion has been applied.
For example, if DI2 is physically high, its physical image in IL1I is 1. If DI2 is configured with inverted logic, the corresponding real image in IL1R becomes 0.
A simple way to understand the relationship is:
Physical input → IL1I → Logic processing/inversion → IL1R → Drive function
If no logic inversion is applied, the physical and real images are the same:
IL1R = IL1I
The two values may differ when the drive needs to invert the state of a logic input before using it for an assigned function.
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