Installation, Wiring,
and Specifications
2–25
Installation, Wiring, and Specifications
Glossary of Specification Terms
Discrete Input One of eight input connections to the PLC which converts an electrical
signal from a field device to a binary status (off or on), which is read by the
internal CPU each PLC scan.
Discrete Output One of six output connections from the PLC which converts an internal
ladder program result (0 or 1) to turn On or Off an output switching device.
This enables the program to turn on and off large field loads.
I/O Common A connection in the input or output terminals which is shared by multiple
I/O circuits. It usually is in the return path to the power supply of the I/O
circuit.
Input Voltage Range The operating voltage range of the input circuit.
Maximum Voltage Maximum voltage allowed for the input circuit.
ON Voltage Level The minimum voltage level at which the input point will turn ON.
OFF Voltage Level The maximum voltage level at which the input point will turn OFF
Input Impedance Input impedance can be used to calculate input current for a particular
operating voltage.
Input Current Typical operating current for an active (ON) input.
Minimum ON Current The minimum current for the input circuit to operate reliably in the ON
state.
Maximum OFF Current The maximum current for the input circuit to operate reliably in the OFF
state.
OFF to ON Response The time the module requires to process an OFF to ON state transition.
ON to OFF Response The time the module requires to process an ON to OFF state transition.
Status Indicators The LEDs that indicate the ON/OFF status of an input or output point. All
LEDs on DL05 Micro PLCs are electrically located on the logic side of the
input or output circuit.
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