Omron ZEN Operation Manual page 171

Application Examples
Greenhouse Air Circulation Control (1/3) (Bit Logic
and Timer)
Application
The ZEN can be used to control circulation intermittently at set times. This circulates the
carbon dioxide and warm air around plants in a greenhouse.
In this example, two circulation fans are operated at set intervals. The starting current is
kept to a minimum and, as a result, the circulation fans are set to start operating at
different times.
System Configuration
(200 VAC)
R S T
L N
MC1 MC2
MC1 (Q0)
IM IM
Circulation fan Circulation fan
1 2
Program Example
I0 Operates
00
I1 Stops
01
M0
02
03
04
05
06
07
SW1 (I0) (Operate)
ON
SW2 (I1)(Stop)
OFF
ZEN-
SW1 (I0)
10C@AR-A-V2
SW2 (I1)
Circulation fan 1 (Q0)
Circulation fan 2 (Q1)
MC2 (Q1)
Circulation fan 1 starts operation when the operation
switch is pressed. Circulation fan 2 starts operation 30
seconds later. The fans operate in a repeated cycle of 60
minutes ON, 90 minutes OFF.
T1
T0
T2
T1
T1 T2
T0
SM0
RM0
Fan 1 starts
[Q0
Startup time offset timer
TT0
Fan 2 starts
[Q1
Operation timer
TT1
TT2 Stop timer difference count
Appendix E
T0 T0
147