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2-6SectionOffset and Gain Adjustment
30
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 IR word
n+1.
SHIFT
CONT
#
1
B
0
A
1
B
0
A
0
A
MONTR
10100 10104
^ ON ^OFF
REC
RESET
10100 10104
OFF ^OFF
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 “Special I/O Unit Errors” may occur when the power supply
is turned ON or when the Unit is restarted, causing a malfunction.
When making adjustments, be sure to perform both the offset adjustment and
gain adjustment.
Note The EEPROM can be overwritten 50,000 times.
The procedure for adjusting the analog input gain is explained below. As shown
in the following diagram, the gain is adjusted by sampling inputs so that the con-
version value is maximized.
10 V0
0FA0
Input signal range:
0 to 10 V
Gain adjustment input range
The following example uses input number 1 adjustment for illustration. (The unit
number is 0.)
1, 2, 3... 1. Turn ON bit 01 (the Gain Bit) of IR word n+1. (Hold the ON status.)
SHIFT
CONT
#
1
B
0
A
1
B
0
A
1
B
MONTR
10101
^OFF
PLAY
SET
10101
ON
The analog input’s digital conversion values while the Gain Bit is ON will be
monitored in IR word n+8.
Gain Adjustment
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