268
Adjusting Offset and Gain Section 6-9
Offset Adjustment The procedure for adjusting the analog input offset is explained below. As
shown in the following diagram, the offset is adjusted by sampling inputs so
that the conversion value becomes 0000.
The following example uses input number 1 adjustment for illustration. (The
unit number is 0.)
1,2,3... 1. Turn ON bit 00 (the Offset Bit) of CIO word n+1. (Hold the ON status.)
The analog input’s digital conversion values while the Offset Bit is ON will
be monitored in CIO word n+8.
2. Check whether the input devices are connected.
10 V0
0FA0
Offset adjustment input ran
e
Input signal range:
0 to 10 V
CLR
000000 CT00
SHIFT
CONT
#
2
C
0
A
0
A
1
B
0
A
0
A
MON
200100 ^ OFF
SET
200100 ^ ON
A6
A7
A8
A6
A7
A8
+
–
+
–
Voltage input
Input 1
Current input
Input 1
For current input, check that the voltage/
current switch is ON.
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