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Basic Concepts Section 2-1
• 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.
• 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.
Downwardly Differentiated Instructions (Instruction preceded by %)
• 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.
• 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 the execution condi-
tion (power flow) when results switch from ON to OFF. The execution con-
dition will turn OFF the next cycle.
Note a) Unlike the upwardly differentiated instructions, downward differen-
tiation variation (%) can only be added to LD, AND, OR, SET and
RSET instructions. To execute downward differentiation with other
instructions, combined the instructions with a DIFD or a DOWN in-
struction.
b) Upwardly and downwardly differentiated instructions can be re-
placed by combinations of DIFFERENTIATE UP (DIFU) and DIF-
Upwardly differentiated input instruction
Example
ON execution condition created for one
cycle only when CIO 000103 goes from
OFF to ON.
Upwardly differentiated input instruction
Example
OFF execution condition created for one
cycle only when CIO 00103 goes from
OFF to ON.
0001
03
(%) Downwardly dif-
ferentiated instruction
Example
Executes the SET instruction once
when CIO 000102 goes ON to OFF. .
%SET
Downwardly differentiated instruction
Example
Will turn ON when the CIO 000103 switches from
ON → OFF and will turn OFF after one cycle.
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