Omron CS1G/H-CPUxx-EV1 Programming Manual page 71

Basic Concepts
Input-differentiated Instructions
Upwardly Differentiated Instructions (Instruction Preceded by @)
Downwardly 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.
(@) Upwardly-differ
entiated instruction
• Input Instructions (Logical Starts and Intermediate Instructions): The
instruction reads bit status, makes comparisons, tests bits, or perform
other types of processing every cycle and will output an ON execution
condition (power flow) when results switch from OFF to ON. The execu-
tion condition will turn OFF the next cycle.
Upwardly differentiated input instruction
• Input Instructions (Logical Starts and Intermediate Instructions): The
instruction reads bit status, makes comparisons, tests bits, or perform
other types of processing every cycle and will output an OFF execution
condition (power flow stops) when results switch from OFF to ON. The
execution condition will turn ON the next cycle.
Upwardly differentiated input instruction
• Output instructions: The instruction is executed only during the cycle in
which the execution condition turned OFF (ON → OFF) and is not exe-
cuted in the following cycles.
(%) Downwardly dif-
ferentiated instruction
Example
@MOV
Executes the MOV instruction once when
CIO 000102 goes OFF → ON.
Example
ON execution condition created for one
cycle only when CIO 000103 goes
from OFF to ON.
Example
0001
03
OFF execution condition created for one
cycle only when CIO 00103 goes from
OFF to ON.
Example
%SET
Executes the SET instruction once
when CIO 000102 goes ON to OFF.
Section 2-1
35