Linear eMerge 50P - Normally Closed Parallel Resistor Input Circuits; Normally Closed Series Resistor Input Circuits

Connecting Readers, Inputs, Outputs, and Temperature Sensors
233190 X3 Linear LLC 17 May 2013
The configuration of resistors shown in Figure 11 must be installed for
supervised input resistance values to be properly read by the system. The four
states of the dual resistor input circuits are read according to the values in the
following table.
Input State
Resistance Values
Normal 1k Ohms
Alarm 0.5k Ohms or 2k Ohms
Short 0k Ohms
Open No current (∞ Ohms)
Normally Closed Parallel Resistor Input Circuits
Figure 12. Normally closed parallel resistor input circuit.
The three states of the normally closed parallel resistor input circuit are read
according to the values in the following table.
Input State
Resistance Values
Normal 0k Ohms
Alarm 1k Ohms
Open No current (∞ Ohms)
Normally Closed Series Resistor Input Circuits
Figure 13. Normally closed series resistor input circuit.
NC Series Resistor
NC Parallel Resistor