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Detailed Description of User Settings Area Data
Section 4-2
4-2-3
Zero/Span Adjustment
The zero point and span point can be adjusted for a process value.
The zero adjustment offsets the line plotting values before and after adjust-
ment parallel to the original line. The span adjustment changes the slope of
the line (i.e., the gain) around the minimum value in the range.
The zero adjustment value and the span adjustment gain are set in the DM
Area words allocated in the CPU Unit. The settings are applied to the value
after scaling.
These settings are refreshed during operation, so the values can be adjusted
under normal operating conditions.
The Universal Input Units zero/span can be adjusted using a calibration
device, as described below.
1,2,3...
1.
Connect the Programming Device to the CPU Unit.
2.
The following table shows the appropriate calibration device to connect for
each input type.
3.
Turn ON the power to the PLC and calibration device, and wait for the re-
quired warm-up time.
4.
Input a signal equivalent to 0% from the calibration device, and check the
process value in the CPU Unit’s CIO Area using the Programming Device.
Zero adjustment value
Maximum range
Output data
Maximum range
Minimum range
Before adjustment
Minimum range
Input
After adjustment
Gain for
span
adjustment
Zero/Span Adjustment
Input type
Calibration device
Thermocouple input
Thermocouple calibrator
Platinum resistance thermometer input
Variable resistor
Voltage input
Voltage and current generator
Current input
Voltage and current generator
Summary of Contents for SYSMAC CJ1W-AD04U
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