Chapter 1 Introduction
1-5
Terminology
Definition
Remarks
Sink input
The mode that the current flows from the switch to PLC input terminal
when input signal is ON.
Z : Input
resistance
Source input
The mode that the current flows from PLC input terminal to the switch
when input signal is ON.
Sink output
The mode that the current flows from load to output terminal when
PLC output contact is ON.
Source output
The mode that the current flows from output contact when PLC output
contact is ON.
+
−
Z
Power
PLC
Switch
Common
Current
+
−
Z
Power
PLC
Current
Switch
Common
+
−
Power
PLC
Current
Output contact
Common
Loa
d
−
Power
PLC
Current
Output
contact
Common
+
Loa
d