6-56 Applied Operation PLZ-4W
6.8.7 External Control of Load On and Load Off
The external control connector can be used to control the on/off of the load and
monitor the on/off condition.
External contact control
To control the load on/off using an external contact, an external signal is applied
across pins 7 and 12 of the J1 connector.
Even when the load on/off is controlled through the external contact, the LOAD
switch on the panel is effective when the load is turned on externally. However,
when the load is turned off externally, the LOAD switch cannot be used to turn the
load on.
You can select the logic used to externally control the load on/off using the menu
setup. To change the logic, select “2. Configuration” | “4. External” | “Load On IN”
from the menu and specify LOW or HIGH.
• For a description of changing the menu setup, see section 5.13, “Menu Setup.”
Table 6-11 Load on/off logic setting
Fig. 6-40 Equivalent input circuit
• The input terminal is connected to +5 V of the J1 connector through approxi-
mately 10 k of resistance. The maximum allowable voltage is 5 V, and the oper-
ation threshold level is TTL.
Load On IN
External contact (SW)
ON (close) OFF (open)
LOW Load on Load off
HIGH Load off Load on
k
A COM
LOAD ON/OFF
CONT
J1
SW
7
12
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