Omron ZEN Operation Manual page 150

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 differ-
ent times.
System Configuration
(200 VAC)
R S T
L1 L2N
NC
MC1 MC2
MC1 (Q0)
IM IM
Circulation fan Circulation fan
Program Example
I0 Operate
00
I1 Stop
01
M0
02
03
04
05
06
07
SW1 (Operate)
ON
SW2 (Stop)
OFF
ZEN-
SW1 (I0)
10C@AR-A
SW2 (I1)
Circulation fan 1
Circulation fan 2
Circulation fan 1 starts operation when the operation
MC2 (Q1)
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
Appendix D
T0 T0
127