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CJ-series Process Analog I/O Unit


A Single Unit Handling All Types of Inputs such as Temperature Sensor Inputs and Analog Signal Inputs (e.g., 4 to 20 mA or 1 to 5 V). This unit is available for CJ/NJ controller.

Applicable ControllerCJ/NJ Series
Unit classificationCJ-series Special I/O Unit
Mounting positionCPU Rack or Expansion Rack
Maximum number of Units40 (within the allowable current consumption and power consumption range)
Unit numbers00 to 95 (Cannot duplicate Special I/O Unit numbers.)
Areas for
with CPU
Special I/O Unit
(Operation Data)
10 words/Unit
Direct Current Input Unit to CPU Unit:
All process values, process value alarms (LL, L, H, HH), rate-of-change values, rate-of-change alarms
(L, H), disconnection alarms, cold junction sensor errors, adjustment period end/notice
DM Area words
allocated to
Special I/O Units
(Setting parameter)
100 words/Unit
CPU Unit to Direct Current Input Unit:
Input signal type, scaling of process value in industrial units, process value alarm setting (L, H), inrush
input upper limit, inrush input upper limit time, zero/span adjustment value, Square root function.
Temperature input signal type, input range (user set), scaling of process value data to be stored in
allocated words in CIO area, rate-of-change input range, scaling of rate-of-change data, number of
items for moving average, process value alarm setting (LL, L, H, HH), rate-of-change alarm setting (L,
H), zero/span adjustment value
Expansion Control/
Monitor Area
Operation Data)
35 words/Unit
CPU Unit to Direct Current Input Unit:
Bits for beginning or resetting the hold function selection, adjustment period control, control bits
Direct Current Input Unit to CPU Unit:
Adjustment period notices, peak and bottom values, top and valley values, integral values
Expansion Setting
(Expansion Setting
46 words/Unit
CPU Unit to Direct Current Input Unit:
Expansion Setting Area settings, adjustment period control, peak and bottom detection, top and valley
detection, integral value calculation
Number of inputs2
Input signal type4 to 20 mA, 0 to 20 mA, 0 to 10 V, -10 to 10 V, 0 to 5 V, -5 to 5 V, 1 to 5 V, 0 to 1.25 V, -1.25 to
1.25 V (separate for each input), and ±10-V user-set range (specified range within -10.000 V to
10.000 V)
ScalingData to be stored in the allocated words in the CIO area must be scaled (Any minimum and maximum
values can be set.) (2 inputs set separately.) Data can be converted at 0% to 100%.
Data storage in the CIO AreaThe value derived from carrying out the following processing in order of the actual process data in
the input range is stored in four digits hexadecimal (binary values) in the allocated words in the CIO
1) Mean value processing → 2) Scaling → 3) Zero/span adjustment → 4) Square root calculation →
5) Output limits
Accuracy (25 ° C)±0.05%
Temperature coefficient±0.008%/°C
Input signal rangeFor 4 to 20 mA, 0 to 20 mA, 0 to 10 V, 0 to 5 V, 1 to 5 V, 0 to 1.25 V inputs: -15 to 115%
For -10 to 10 V, -5 to 5 V, -1.25 to 1.25 V inputs: -7.5 to 107.5%
Input impedanceFor current inputs: 250 Ω (typical)
For voltage inputs: 1 MΩ min.
Warmup time10 min
Conversion period10 ms/2 inputs
Maximum time to store data in
CPU Unit
Conversion period + one CPU Unit cycle
Input error detectionCheck only for 4 to 20 mA and 1 to 5 V.
Error detected for -17.2% (1.25 mA, 0.3125 V) or less and 112.5% (22 mA, 5.5 V) or more.
Operation at input
For 4 to 20 mA and 1 to 5 V: Stores -15% process value.
For all other ranges: Stores same process value as 0-V or 0-mA inputs.
Input disconnection detection
delay time
Approx. 1 s.
FunctionMean value
(input filter)
Calculates the moving average for the past specified number of process values (1 to 128 can be
specified), and stores that value in the CIO Area as the process value.
Process value alarmProcess value 4-point alarm (LL, L H, HH), hysteresis, and ON-delay timer (0 to 60 s) are available.
Calculates the amount of change per comparison time interval (1 to 16 s).
Rate-of-change 2-point alarm (H, L), alarm hysteresis, and ON-delay timer (0 to 60 s are available,
shared with process value alarm).
Square root
When the maximum value for process value scaling is A and the minimum value is B,

Drop-out: Output approx. 7% max. linear (output = input) characteristic
Note 1.
The square root function can only be used when the maximum scaling value is greater than the
minimum scaling value. The square root will not be found if the maximum is smaller than the minimum.
Note 2.
When the square root function is used, set the scaling values after square root calculation (e.g., for
flow rates or other values) for the process value scaling A and B settings.
Adjustment period
When zero/span adjustment is executed, the date is internally recorded at the Unit. When the preset
zero/span adjustment period and the notice of days remaining set in the Expansion Setting Area have
elapsed, this function turns ON a warning flag to give notice that it is time for readjustment.
Peak and bottom
Detects the maximum (peak) and minimum (bottom) analog input values, from when the Hold Start Bit
(output) allocated to the Expansion Control/Monitor Area turns ON until it turns OFF. These values
are stored as the peak and bottom values in the Expansion Control/Monitor Area.
Top and valley
This function detects the top and valley values for analog inputs, from when the Hold Start Bit
(output) allocated to the Expansion Control/Monitor Area turns ON until it turns OFF. These values
are stored as the top and valley values in the Expansion Control/Monitor Area.
Integral value
This function calculates the analog input value's time integral. The integral value is calculated and
output to the Expansion Control/Monitor Area when the Integral Value Calculation Start Bit in the
Expansion Control/Monitor Area is turned ON.
IsolationBetween inputs and between inputs and Controller signals: Isolation by transformer and photocoupler.
Insulation resistance20 MΩ (at 500 V DC) between all inputs
Dielectric strengthBetween inputs: 1,000 V AC, at 50/60 Hz, for 1 min, leakage current 10 mA max.
External connectionsTerminal block (detachable)
Unit number settingsSet by rotary switches on front panel, from 0 to 95.
IndicatorsFour LED indicators on front panel (for normal operation, errors detected at the Direct Current Input
Unit, and errors detected at the CPU Unit).
Front panel connectorSensor input connector terminal block (detachable)
Current consumption5 V DC at 180 mA max.
External power supply24 V DC +10%/-15% 90 mA max., inrush current: 20 A for 1 ms max.
(The external 24-VDC power supply must be isolated.)
Dimensions31 × 130 × 65 mm (W × H × D)
Weight150 g max.
Standard accessoriesShort bars (for current input)