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CS/CJ/NSJ Series Instructions Reference Manual (W474)
4. Instruction Execution Times and Number of Steps
Add the following value (n) to the program capacity (unit: words) of the previ-
ous PLCs for instruction to obtain the program capacity (unit: steps) of the
CS-series PLCs.
For example, if OUT is used with an address of CIO 000000 to CIO 25515, the
program capacity of a C200HX/HG/HE PLC would be 2 words per instruction
and that of the CS-series PLC would be 1 (2 – 1) step per instruction.
For example, if !MOV is used (MOVE instruction with immediate refreshing),
the program capacity of a CVM1 or CV-series PLC would be 4 words per
instruction and that of the CS-series PLC would be 7 (4 + 3) steps.
Note Number of Function Block Program Steps (CPU Units with Unit Version 3.0 or
later)
Use the following equation to calculate the number of program steps when
function block definitions have been created and the instances copied into the
user program using CS/CJ-series CPU Units with unit version 3.0 or later.
Note The number of instruction steps in the function block definition (p) will
not be diminished in subsequence instances when the same function
block definition is copied to multiple locations (i.e., for multiple in-
stances). Therefore, in the above equation, the number of instances
is not multiplied by the number of instruction steps in the function
block definition (p).
CS-series steps = “a” (words) of previous PLC + n
Instructions Variations Value of n when
converting from
C200HX/HG/HE to
CS Series
Value of n when
converting from
CV-series PLC or
CVM1 to CS
Series
Basic
instructions
None OUT, SET, RSET,
or KEEP(011): –1
Other instructions:
0
0
Upward Differentiation None +1
Immediate Refreshing None 0
Upward Differentiation and
Immediate Refreshing
None +2
Special
instructions
None 0 –1
Upward Differentiation +1 0
Immediate Refreshing None +3
Upward Differentiation and
Immediate Refreshing
None +4
Number of steps
= Number of instances × (Call part size m + I/O parameter transfer part size n × Num-
ber of parameters) + Number of instruction steps in the function block definition p
(See note.)
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