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E6581381
B-9
2
■ SINK (Negative) logic/SOURCE (Positive) logic (When an external power supply
is used)
The PLC terminal is used to connect to an external power supply or to insulate a terminal from other input
or output terminals. As for input terminals, turn the SW4 slide switch to the PLC position.
<Examples of connections when an external power supply is used>
Source (Positive) logic
Inverter
PLC
F
Programmable
controller
Common
Output
Input
24V
DC
Sink (Negative) logic
F
Output
Input
24V
DC
Inverter
Programmable
controller
Slide switch SW4:PLC Slide switch SW4:PLC
PLC
Common
■ Selecting the functions of the VIA terminals between analog input and contact
input
The functions of the VIA terminal can be selected between analog input and contact input by changing
parameter settings (
H). (Factory default setting: Analog input)
When using these terminals as contact input terminals in a sink logic circuit, be sure to insert a resistor
between the P24 and VIA terminals. (Recommended resistance: 4.7K
Ω-1/2W)
When using the VIA terminal as a contact input terminal, be sure to turn the VIA (SW3) switch to the V
position. If no resistor is inserted or the VIA (SW3) slide switch is not turned to the V position, contact input
will be left always ON, which is very dangerous.
Switch between analog input and contact input before connecting the terminals to the control circuit
terminals. Otherwise the inverter or devices connected to it may be damaged.