Omron ZEN - Page 171

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Application Examples Appendix E
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
Program Example
SW1 (I0)
SW2 (I1)
T1
T2
T0 T0 T0
RST
LN
MC1 MC2
MC1 (Q0) MC2 (Q1)
IM IM
ON
OFF
(200 VAC)
SW1 (I0) (Operate)
SW2 (I1)(Stop)
ZEN-
10C@AR-A-V2
Circulation fan
1
Circulation fan
2
Circulation fan 2 (Q1)
Circulation fan 1 (Q0)
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.
M0 T1
T1
T2
T0
SM0
RM0
[Q0
TT0
[Q1
TT1
TT2
00
01
02
03
04
05
06
07
Fan 1 starts
I1 Stops
I0 Operates
Startup time offset timer
Operation timer
Fan 2 starts
Stop timer difference count
Z211-E1-03.book Page 147 Friday, November 21, 2008 10:38 AM