116
Adjusting Offset and Gain Section 3-7
3. Input the voltage or current so that the conversion value becomes 0000.
The following table shows the offset adjustment voltages and currents to
be input according to the input signal range.
4. After inputting the voltage or current so that the conversion value for the
analog input terminal is 0000, turn ON bit 04 (the Set Bit) of CIO word n+1,
and then turn it OFF again.
While the Offset Bit is ON, the offset value will be saved to the Unit’s EE-
PROM when the Set Bit turns ON.
5. To finish the offset adjustment, turn OFF bit 00 (the Offset Bit) of CIO word
n+1.
!Caution Do not turn OFF the power supply or restart the Unit while the Set Bit is ON
(data is being written to the EEPROM). Otherwise, illegal data may be written
in the Unit’s EEPROM and “EEPROM Errors” may occur when the power sup-
ply is turned ON or when the Unit is restarted, causing a malfunction.
!Caution When making adjustments, be sure to perform both the offset adjustment and
gain adjustment at the same time.
Note 1. The EEPROM can be overwritten 50,000 times.
2. While the Offset Bit or the Gain Bit is ON, the present conversion data will
be displayed in word n+8.
If the Offset Bit or the Gain Bit is OFF, the value immediately prior to turning
the bit OFF will be held.
Input signal range Input range Word (n+8) monitoring
value
0 to 10 V –0.5 to 0.5 V FF38 to 00C8 (4,000 res-
olution)
FE70 to 0190 (8,000 res-
olution)
–10 to 10 V –1.0 to 1.0 V
1 to 5 V 0.8 to 1.2 V
0 to 5 V –0.25 to 0.25 V
4 to 20 mA 3.2 to 4.8 mA
SHIFT
CONT
#
2
C
0
A
0
A
1
B
0
A
4
E
MON
200104 ^ OFF
SET
200104 ^ ON
RESET
200104 ^ OFF
SHIFT
CONT
#
2
C
0
A
0
A
1
B
0
A
0
A
MON
200100 ^ ON
RESET
200100 ^ OFF
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