118
Adjusting Offset and Gain Section 3-7
3. Input the voltage or current so that the conversion value is maximized
(0FA0 or 07D0 at a resolution of 4,000). The following table shows the gain
adjustment voltages and currents to be input according to the input signal
range.
(Values in parentheses are for a resolution of 8,000.)
4. With the voltage or current having been input so that the conversion value
for the Analog Input Unit is maximized (0FA0 or 07D0 for a resolution of
4,000), turn bit 04 (the Set Bit) of CIO word n+1 ON and then OFF again.
While the Gain Bit is ON, the gain value will be saved to the Unit’s EE-
PROM when the Set Bit turns ON.
5. To finish the gain adjustment, turn OFF bit 01 (the Gain 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 9.5 to 10.5 V 0ED8 to 1068 (1DB0 to 20D0)
–10 to 10 V 9.0 to 11.0 V 0708 to 0898 (0E10 to 1130)
1 to 5 V 4.8 to 5.2 V 0ED8 to 1068 (1DB0 to 20D0)
0 to 5 V 4.75 to 5.25 V 0ED8 to 1068 (1DB0 to 20D0)
4 to 20 mA 19.2 to 20.8 mA 0ED8 to 1068 (1DB0 to 20D0)
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
1
B
MON
200101 ^ ON
RESET
200101 ^ OFF
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