Input resistance refers to the resistance value of a device, and it is closely related to the allowable load resistance of the connected device.
When building a system (transmitting signals from Device A to Device B), if Device A’s allowable load resistance is not greater than or equal to Device B’s input resistance, problems such as incorrect output values may occur.
For example, for an output of DC 4–20 mA (with an allowable load resistance of 750 Ω), you can connect up to 3 devices with an input resistance of 250 Ω each, or up to 15 devices with an input resistance of 50 Ω each.
Input Resistance
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