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Adjusting Offset and Gain Section 7-9
7-9-1 Adjustment Mode Operational Flow
The adjustment mode enables the input or output of the connected devices to
be calibrated. Refer to 2-7 Adjusting Offset and Gain and 4-7 Adjusting Offset
and Gain for details of input and output functions. The following diagram
shows the flow of operations when using the adjustment mode for adjusting
offset and gain.
!Caution Set the PLC to PROGRAM mode when using the Analog I/O Unit in adjust-
ment mode. If the PLC is in MONITOR mode or RUN mode, the Analog I/O
Unit will stop operating, and the input and output values that existed immedi-
ately before this stoppage will be retained.
Turn ON the PLC.
When adjusting another I/O number
When adjusting the same I/O number
Set the I/O number.
Offset adjustment
Offset Bit ON
Set Bit ON
The ADJ indicator will flash while in adjustment mode
.
Start up the PLC in PROGRAM mode.
Gain adjustment
Gain Bit ON
Input adjustment
Output adjustment
Set Bit ON
Input adjustment Output adjustment
Set D(m+18) to adjustment mode.
Restart the Unit using the Special I/O Unit Restart Bit
or turn the power supply to the PLC OFF and ON.
Write the I/O number to be adjusted
in the rightmost byte of CIO word n.
(Bit 0 of CIO word
n+1 turns ON.)
Sampling
input
Adjustment
value setting
(Add inputs so that
conversion value
becomes 0.)
(Bits 2 and 3 of
CIO word n+1
turn ON.)
(Bit 4 of CIO word
n+1 turns ON.)
(Bit 1 of CIO word
n+1 turns ON.)
Sampling
input
Adjustment
value setting
(Add inputs so that
conversion value is
maximized.)
(Bits 2 and 3 of
CIO word n+1
turn ON.)
(Bit 4 of CIO word
n+1 turns ON.)
Set D(m+18) to normal mode.
Restart the Unit using the Special I/O Unit Restart Bit
or turn the power supply to the PLC OFF and ON.
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