Forced-Zero Shift - Omron CQM1H series Operation Manual

Forced-zero Shift

6-3

Forced-zero Shift

Reference
202
For the Largest Object
4. Adjust the H value with the largest object next. The input word reads 1000,
which is the scaled conversion data of the largest object measured with the
Unit, and the output word reads 0000.
5. Input the set value teach command code C820 for the H value. The input
word will be set to the response C820.
C
C
2
SHIFT
CHG
6. Set 0000 to the output word again. The input word will be set to 1000.
A A
0 0
CHG
To check the adjusted values, execute the set value read command with the
command code C910 or C920.
Use the forced-zero shift function to measure the relative values of objects
based on the standard value determined for the Unit. This function requires
ZERO and ZRES (zero reset) inputs to the Unit.
When zero input is turned ON while the Unit is sampling data, the scaled conver-
sion data will be shifted to zero and stored as binary data in the input word, or the
comparison result flags of the input word are turned ON or OFF according to the
comparison result processed by the Unit.
After the above processing, the sampling is performed with side A treated as the
reference side. As the object moves, the Unit measures side B of the object and
the scaled conversion data indicates the difference between the sides A and B.
Note 1. The forced-zero shift function is not effective when the timing hold is set to
peak-to-peak hold.
2. The zero shift value stored in the RAM will be lost when the Unit is turned
OFF. The RAM should be used to store the zero shift value if the zero shift
function is frequently used during operation. The zero shift value stored in
the nonvolatile memory will not be lost when the Unit is turned OFF. The zero
shift value stored in the nonvolatile memory may not be, however, used
more than 100,000 times. Decide where to keep the zero shift value accord-
ing to the application.
The Unit ignores zero input when zero reset input is ON. Use the operation mode
B set command to select the RAM or nonvolatile memory to store the zero shift
value.
c100 c001
0000 1000
C A
8 2
0
WRITE
c100 c001
C820 C820
c100 c001
A A
0 0
WRITE
0000 0100
Side B
Side A
Object
Zero input ON
Section 6-3
Sensor input
Measured
value