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Basic Concepts Section 2-1
2-1-8 Execution Conditions
The CS/CJ Series offers the following types of basic and special instructions.
• Non-differentiated instructions executed every cycle
• Differentiated instructions executed only once
Non-differentiated Instructions
Output instructions that required execution conditions are executed once
every cycle while the execution condition is valid (ON or OFF).
Input instructions that create logical starts and intermediate instructions read
bit status, make comparisons, test bits, or perform other types of processing
every cycle. If the results are ON, power flow is output (i.e., the execution con-
dition is turned ON).
■ Timing Chart
Input-differentiated Instructions
Upwardly Differentiated Instructions (Instruction Preceded by @)
• Output Instructions: The instruction is executed only during the cycle in
which the execution condition turned ON (OFF → ON) and are not exe-
cuted in the following cycles.
@
Instruction (mnemonic)
Differentiation variation
Immediate refresh variation
Example
Non-differentiated
output instruction
Example
Non-differentiated input instruction
Bit A
Bit B
Bit B
Bit A
Example
Executes the MOV instruction once when
CIO 000102 goes OFF → ON.
(@) Upwardly-differ-
entiated instruction
@MOV
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