
9
NO/NC Double Resistor 1K
This is the standard Software House method of supervision.
1K Ω is considered Secure and 500 Ω or 2K Ω are considered Alert. The wiring for NO and NC is different, as shown in
.
Figure 2: NO / NC Double Resistor 1K
The NO/NC Double Resistor method will report:
■
Short
■
Normal / Secure (1K)
■
Alert (500 Ω or 2K)
■
Open (>30K)
■
Line Fault (Any unexpected value). This is usually due to faulty resistors or incorrect resistor values.