Terminal Block Diagram; Error Processing - Omron CJ Series Operation Manual

2 Isolated-type Direct Current Input Unit

2-1-12 Terminal Block Diagram

B2
V1+
I1+
A2
COM1 B3
B4
V2+
I2+ A4
COM2 B5
A9
24-VDC
circuit
B9

2-1-13 Error Processing

Conversion Data Does Not Change
Probable cause
The gain for span adjustment is set to 0.
The minimum and maximum values for pro-
cess value scaling are either the same or are
set extremely close.
The input signal type or process value range is
set incorrectly.
An input device is malfunctioning, input wiring
is faulty, or wiring is disconnected.
Values are Not Converted as Intended
Probable cause
The input signal type or process value scaling
is set incorrectly.
The zero/span adjustment data is incorrect.
The square root calculation function is operat-
ing.
2-14
250 Ω
A/D
converter
1 MΩ
1 MΩ
250 Ω
A/D
1 MΩ converter
1 MΩ
Power
supply circuit
CJ-series Analog I/O Units Operation Manual for NJ-series CPU Unit(W498)
Isolation circuit
Photocoupler
Isolation circuit
Photocoupler
Remedy
Set the gain for span adjustment to a value other than 0.
Set the minimum and maximum values correctly.
Check and reset the input signal type and the process value
range settings.
Check whether the input voltage or current has changed. Check
for faulty or disconnected wiring.
Check whether an input error has been detected in the I/O
Area.
Remedy
Check and reset the input signal type and the process value
scaling settings.
Check and correct the zero/span adjustment settings.
Set the square root calculation function so that it does not oper-
ate.
5 VDC
Input
selector Digital
circuits