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Specifications Section 2-1
Common Specifications
Item Specifications Reference
Control method Stored program ---
I/O control method Cyclic scan and immediate processing are both possible. ---
Programming • Ladder diagrams
• SFC (sequential function charts)
• ST (structured text)
• Mnemonics
---
CPU processing mode CJ1-H CPU Units: Normal Mode, Parallel Processing Mode with Asyn-
chronous Memory Access, Parallel Processing Mode with Synchro-
nous Memory Access, or Peripheral Servicing Priority Mode
CJ1M CPU Units: Normal Mode or Peripheral Servicing Priority Mode
CJ1 CPU Units: Normal Mode or Peripheral Servicing Priority Mode
---
Instruction length 1 to 7 steps per instruction 10-5 Instruction Execu-
tion Times and Num-
ber of Steps
Ladder instructions Approx. 400 (3-digit function codes) ---
Execution time CJ1-H-R CPU Units:
Basic instructions: 0.016 µs min.
Special instructions: 0.048 µs min.
CJ1-H CPU Units:
Basic instructions: 0.02 µs min.
Special instructions: 0.06 µs min.
CJ1M CPU Units (CPU12/13/22/23):
Basic instructions: 0.10 µs min.
Special instructions: 0.15 µs min.
CJ1M CPU Units (CPU11/12):
Basic instructions: 0.1 µs min.
Special instructions: 0.15 µs min.
CJ1 CPU Units:
Basic instructions: 0.08 µs min.
Special instructions: 0.12 µs min.
10-5 Instruction Execu-
tion Times and Num-
ber of Steps
Overhead time CJ1-H-R CPU Units:
Normal mode: 0.13 ms min.
Parallel processing: 0.28 ms min.
CJ1-H CPU Units:
Normal mode: 0.3 ms min.
Parallel processing: 0.3 ms min.
CJ1M CPU Units (CPU12/13/22/23): 0.5 ms min.
CJ1M CPU Units (CPU11/12): 0.7 ms min.
CJ1 CPU Units: 0.5 ms min.
---
Unit connection
method
No Backplane: Units connected directly to each other. ---
Mounting method DIN Track (screw mounting not possible) 5-2-6 DIN Track Instal-
lation
Maximum number of
connectable Units
• CJ1-H and CJ1 CPU Units:
Per CPU or Expansion Rack: 10 Units including Basic I/O Units,
Special I/O Units, and CPU Bus Units.
Total per PLC: 10 Units on CPU Rack and 10 Units each on 3
Expansion Racks = 40 Units total
• CJ1M CPU Units:
Total of 20 Units in the System, including 10 Units on CPU Rack and
10 Units on one Expansion Rack.
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