Zero/Span Adjustment Example - Omron CJ Series Operation Manual

Appendices
A-2

Zero/Span Adjustment Example

The Analog I/O Unit's zero/span adjustment can be performed as described below using a calibration
device.
1
Connect Sysmac Studio to the CPU Unit.
2
Connect a suitable calibration device as shown in the following table to the Analog I/O Unit.
CJ1W-PDC15
CJ1W-AD04U
CJ1W-PH41U
3
Turn ON the power to the Controller, and wait approximately 10 minutes for the Unit to warm up.
The CJ1W-AD04U requires approximately 30 minutes to warm up.
The CJ1W-PH41U requires approximately 45 minutes to warm up.
4
Make the adjustments.
(1) Input a signal equivalent to 0% from the calibration device, and check the "process value" in
the Operation Data by using the Sysmac Studio. If the value is abnormal, change the "zero
adjustment value" in the Setting Parameter, and adjust the offset (parallel movement) value.
(2) Input a signal equivalent to 100% from the calibration device, and check the "process value"
in the Operation Data by using the Sysmac Studio. If the value is abnormal, change the "gain
for span adjustment" in the Setting Parameter, and adjust the gain (bias).
For the CJ1W-PH41U Isolated-type Universal Input Unit, create a short-circuit between the ter-
minals of the cold junction sensor. This will make the Isolated-type Universal Input Unit discon-
tinue cold junction compensation. Then input a standard thermocouple value of 0°C
(electromotive force data described in IEC 60584-1:1977) to the calibration mV signal.
A-10
Model
DC voltage and current
DC voltage and current
Thermocouple
Platinum resistance thermometer
DC voltage and current
Thermocouple
Platinum resistance thermometer
Potentiometer
CJ-series Analog I/O Units Operation Manual for NJ-series CPU Unit(W498)
Input
Voltage and current generator
Voltage and current generator
Variable resistor
Voltage and current generator
Variable resistor
Calibration device