Omron CJ1W-AD041-V1, Operation Manual

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153
Adjusting Offset and Gain Section 4-7
Note After specifying the DM settings from a Programming Device, it will be neces-
sary to either turn the power to the PLC OFF and ON, or turn ON the Special
I/O Unit Restart Bit to transfer the contents of the DM settings to the Special I/
O Unit.
4-6-4 Output Setting Errors
If the analog output set value is greater than the specified range, a setting
error signal will be stored in CIO word n+9, bits 00 to 07. (Bits 00 to 03 for the
CS1W-DA041.)
For the CIO word addresses, n = CIO 2000 + (unit number x 10).
The voltage for an output number at which a setting error has occurred will be
output according to the output hold function.
4-7 Adjusting Offset and Gain
4-7-1 Adjustment Mode Operational Flow
The adjustment mode enables the output of the connected devices to be cali-
brated.
This function adjusts the output voltage according to the offset value and gain
value at the input device, and sets the settings values at the Unit at that time
to 0000 and 0FA0 (07D0 if the range is
±
10 V) respectively.
For example, suppose that the specifications range for the external input
device (e.g., indicator, etc.) is 100.0 to 500.0 when using in the range 1 to 5 V.
Also, suppose that when voltage is output at the Analog Output Unit at a set
value of 0000, the external input device actually displays 100.5 and not 100.0.
It is possible to make settings to adjust the output voltage (making it smaller in
this case) so that 100.0 is displayed and to make 0000 (not FFFB as in this
case) the set value for which 100.0 is displayed.
Similarly for gain values, suppose that when voltage is output at the Analog
Output Unit at a set value of 0FA0, the external input device actually displays
500.5 and not 500.0. It is possible to make settings to adjust the output volt-
age (make it smaller in this case) so that 500.0 is displayed and to make 0FA0
(not 0F9B as in this case) the set value for which 500.0 is displayed.
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00 Bit
Output 2 Output 1
Word n+9
When a setting error is detected
for a particular output, the corre-
sponding bit turns ON. When the
error is cleared, the bit turns OFF.
Output 4 Output 3 Output 6 Output 5 Output 8 Output 7
External input device
display
Set value before
adjustment (word n+8)
Set value after
adjustment
100.0 FFFB 0000
500.0 0F9B 0FA0