Omron CJ1W-SCU22 Serial Communication Unit
Omron CJ1W-SCU22 Serial Communication Unit
nit classification CJ-series Special I/O Unit
Compatible Racks CJ-series CPU Rack or CJ-series Expansion Rack
Max. number of
Units 10 Units/Rack max. (CPU Rack or Expansion Rack)
CPU Unit data
areas for data
storage/exchange
Special I/O Unit Area (960 words)
CIO 2000 to CIO 2959
20 words/Unit for constant data
exchange (6 output words and 14
input words)
CPU Unit to
Temperature
Control Unit
• Set point (SP)
• Operating commands
• RUN/STOP control
• Start/Stop AT
• Write commands
• Heater burnout set value
Temperature
Control Unit to
CPU Unit
• Process value (PV)
• Set point (SP)
• Status
• Heater current monitor
DM words allocated to Special I/O
Units (9.600 words)
D20000 to D29599
10 words/Unit transferred when
power is turned ON or Unit is
restarted
CPU Unit to
Temperature
Control Unit
• Alarm mode
• Alarm hysteresis
90 words/Unit for regular data
exchange
Two-way transfer
between CPU Unit
and Temperature
Control Unit
• Alarm value
• Input compensation value
• Control period
• Hysteresis
• Proportional band
• Integral time
• Derivative time
• Output monitor
Insulation
resistance
20 MΩ min. (at 500 VDC) between the following points:
• All output and NC terminals and external AC terminals (Power Supply Unit)
• All input terminals and external AC terminals (Power Supply Unit)
• All input terminals and all output terminals
• All external DC terminals (inputs, outputs, and NC) and the FG plate
• Between input terminals (sensor and CT inputs)
• I/O terminals and NC terminals
Dielectric strength
2.000 VAC 50/60 Hz for 1 min., detected current: 1 mA
• The output terminals/NC terminals and external AC terminals (Power Supply Unit)
1.000 VAC 50/60 Hz for 1 min., detected current: 1 mA
• Input terminals and external AC terminals (Power Supply Unit)
• Input terminals and output terminals
• External DC terminals (inputs, outputs, and NC) and the FG plate
500 VAC 50/60 Hz for 1 min., detected current: 1 mA
• Between input terminals (sensor and CT inputs)
• I/O terminals and NC terminals
Internal current
consumption 250 mA max., 5 VDC
Other Other general specifications conform to the CJ-series general specifications.
Dimensions 31 × 90 × 65 mm
Characteristics
*1. The last three digits of the model number indicate the Unit’s features:
*2. Indication accuracy of thermocouples
• Accuracy ratings are given for the Temperature Control Unit used in a set with a cold-junction compensator (on the terminal block). Always
use the Unit and terminal block in a set. There are labels with serial numbers attached to the terminal blocks and Units to help keep track of
the sets.
• When returning a thermocouple-type Temperature Control Unit for repair, always return the Unit and the terminal block (with the cold-junction
compensator) as a set.
Item Specification
Model number CJ1W-TC00@ CJ1W-TC10@
Temperature sensor Thermocouple: R, S, K, J, T, L, B Platinum resistance thermometer: Pt100. JPt100
Number of loops 4 loops or 2 loops with heater burnout detection *1
Control output and
heater burnout alarm
output
NPN or PNP outputs, both with short-circuit protection *1
External power supply voltage: 24 VDC
Max. switching capacity: 100 mA (per output)
Leakage current: 0.3 mA max.
Residual voltage: 3 V max.
Temperature control
method ON/OFF control or PID control with two degrees of freedom (Set with pin 6 on the Unit’s DIP switch.)
Control operation Forward or reverse operation (Set with pins 4 and 5 on the Unit’s DIP switch.)
RUN/STOP control Supported (Controlled from the CPU Unit through bits allocated in the Special I/O Unit area.)
Operation with CPU
Unit in PROGRAM
mode
The Temperature Control Unit can be set to continue operating or stop operating when the CPU Unit is in PROGRAM
mode. (Set with pin 1 on the Unit’s DIP switch.)
Auto/Manual switch for
operational output None
Autotuning (AT) of PID
constant Supported (Controlled from the CPU Unit through bits allocated in the Special I/O Unit area.)
Indication accuracy
Celsius: ±0.3% of PV or ±1°C (whichever is larger) ± 1 dig
it max.
Fahrenheit: ±0.3% of PV or ±2°F (whichever is larger) ± 1
digit max.
• L and −100°C or less for K and T are ±2°C ± 1 digit max.
• 200°C or less for R and S is ±3°C ± 1 digit max.
• No accuracy is specified for 400°C or less for B *2
Celsius: ±0.3% of PV or ±0.8°C (whichever is larger) ± 1
digit max.
Fahrenheit: ±0.3% of PV or ±1.6°F (whichever is larger) ±
1 digit max.
Hysteresis (when using
ON/OFF control) 0.0 to 999.9 °C or °F (0.1 °C or °F units)
Proportional band 0.1 to 999.9 °C or °F (0.1 °C or °F units)
Integral (reset) time 0 to 9.999 s (one-second units)
Derivative (rate) time 0 to 9.999 s (one-second units)
Control period 1 to 99 s (one-second units)
Sampling period 500 ms (4 loops)
Output refresh period 500 ms (4 loops)
Display refresh period 500 ms (4 loops)
Input compensation
value −99.9 to 999.9 °C or °F (0.1 °C or °F units)
Alarm output setting
range
−999 to 9.999 °C or °F (1 °C or °F units)
The setting range will be −99.9 to 999.9 °C or °F (0.1 °C or °F units) for K or J with decimal point mode, or platinum
resistance thermometer.
External terminal
connections Removable terminal block with 18 points (M3 screws)
Effect on the CPU Unit’s
cycle time 0.4ms