LS Industrial Systems GLOFA G7M-DR20U, Руководство пользователя

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Chapter 7. Usage of Various Functions
7-64
4) Scaling function (for G7F-DA2I)
Scaling is the function that changes the offset and gain value for an easy operation.
•
Changing method is as below.
Scaling conversion value
800
4000
3200) value input (Digital
+
×
=
Example) Digital value 1000 input in a range of 0 ~ 20
㎃
•
Before the scaling conversion (current range 0 ~ 20mA):
5mA
4000
20 1000
4000
20) value input (Digital
=
×
=
×
•
After the scaling conversion (current range 4 ~ 20mA):
8mA 5μA 1600 800
4000
3200 1000
800
4000
3200) value input (Digital
= × = +
×
= +
×
5) Wiring
(1) Caution for wiring
•
Make sure that external input signal of the mixture module of AC and analog I/O is not affected by induction noise or
occurs from the AC through using another cable.
•
Wire is adopted with consideration about peripheral temperature and electric current allowance. For wire, thicker than
AWG22 (0.3
㎟
) one is recommended.
•
If wire is put near to high temperature radiated device or contacted with oil for a long time, it may cause of electric
leakage so that it gets broken or miss-operation during wiring.
•
Be sure to connect with care of polarity while connecting to external 24V DC power supply.
•
In case of wiring with high voltage line or generation line, it makes induction failure so then it may cause of miss-
operation and out of order.
4000
0
0 ㎃
20 ㎃
4000
0
4 ㎃
20 ㎃
Resolution: 20
㎃
/4000 = 5
㎂
Resolution: 20
㎃
/3200 = 6.25
㎂
800