88
Analog Inputs (Analog Comparators (A)) Section 3-10
Note
Connect the negative side to COM for analog inputs. The analog
input circuit may be destroyed if the positive side is connected to
COM.
Operation
Precautions for Correct Use
• Do not make negative signal inputs to analog inputs. If negative
signals are made, the internal elements may be damaged.
• A delay of up to 26 times the cycle time may occur from the time an
analog voltage equivalent to the SV is input until the analog
comparator bit turns ON. Refer to Appendix B Ladder Program
Execution on page 129 and be sure that this delay will not create
any problems.
12 to 24 VDC
12 to 24 VDC
Analog signal input:
0.0 to 10.0 V
Device with
analog voltage
output
Device with
analog voltage
output
(DC power supply type)
Analog input 1: I4
Analog input 2: I5
DC power supply typeAnalog input: Ia
Analog input: Ib
Analog signal input:
0.0 to 10.0 V
10.0
00.0
10.5
10.0
5.2
00.0
0.0
10.0 V
10.5 V
•Example 1
(When comparison shows analog
input 1 ≥ 5.2 V)
Setting
Analog
comparator bit
Input voltage
•Example 2
(When comparison shows analog
input 1 is ≤ analog input 2)
The analog comparator bit turns
ON when the analog input voltage
reaches is 5.2 V or higher.
Analog
comparator bit
Converted value
Analog input 1
Analog input 2
The analog comparator bit turns ON
when the analog input 2 voltage is
higher than the analog input 1 voltage.
Z211-E1-03.book Page 88 Friday, November 21, 2008 10:38 AM
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