98
PLZ-4WH
Turning the Load On and Off through External Control
You can use an external control signal to turn the load on and off, and you can check whether
the load is on or off.
Signal Input for turning the load on and off
To turn the load on and off using an external contact, you need to apply an external signal
across pin 7 and 12 of the EXT CONT connector.
When you turn the load off through an external contact, the LOAD key on the front panel
becomes invalid.
You can select the logic (LOW or HIGH) to use to turn the load on and off using the menu
setup. Select “2. Configuration” > “3. External” > “Load On In.” Turn the power switch off and
then on again to enable the settings.
If you are not going to control the output using an external contact, set the logic to “HIGH”
(the default setting).
The input pin is pulled up to the
internal circuit’s +5 V level by a resistor
that is approximately 10 k
Ω
. The
maximum allowable voltage is 5 V. The
logic threshold levels are CMOS.
Load-on status signal output
To monitor the status (on or off) of the load externally, monitor the output signal across pins
137 and 17 of the EXT CONT connector.
See
On
Off
H = On
L = Off
▼ indicates that the LOAD key has been pressed.
The LOAD has been
turned on by the
external contact, so
the load key is valid.
The LOAD key is invalid.
Even if the LOAD key is
pressed, the load will
not turn on.
For the external contact
to turn the load on again,
the load must first be
turned off once.
External
contact
Load
Example when the load is turned on by a
high level signal from the external contact
Load On Input
External Contact
ON (closed)
OFF (open)
LOW
Load on
Load off
HIGH
Load off
Load on
+5 V
約10 kΩ
A COM
LOAD ON/OFF
CONT
EXT CONT
SW
7
12
Photocoupler (P.C)
Maximum applied voltage: 30 V
Maximum current:
8 mA
13
17
EXT CONT
Load on
Load off
Photocoupler
On
Off
Содержание PLZ1004WH
Страница 13: ...Installation and Preparation This chapter describes how to unpack and prepare this product before you use it 1 ...
Страница 28: ...28 PLZ 4WH Remote Sensing ...
Страница 29: ...Basic Functions This chapter explains the operations for each operation mode and other basic functions 2 ...
Страница 47: ...Advanced Operations This chapter explains ABC preset memory setup memory protection functions and the menu 3 ...
Страница 61: ...Sequences This chapter explains the sequence function Sequences 4 ...
Страница 83: ...External Control and Parallel Operation This chapter explains external control and Parallel Operation 5 ...
Страница 115: ...Maintenance This chapter describes the maintenance procedures including cleaning inspection and calibration 7 ...
Страница 127: ...8 Specifications This chapter contains the specifications and gives the dimensions of the PLZ 4WH ...
Страница 137: ...Appendix A Operating Area B Sequence Program Creation Table C Options ...