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Chapter 5 Instruction Specifications
5-107
Item number Control instructions-7 Name NEXT
Ladder format Condition code
Processing time (µs)
Remark
R7F4 R7F3 R7F2 R7F1 R7F0
Average Maximum
NEXT n DER ERR SD V C
z 1] zzz
Instruction format Number of steps
38
Condition Steps
NEXT n 2
Bit Word Double word
Usable I/O
XY
R,
M
TD, SS,
CU, CT WX WY
WR,
WM TC DX DY
DR,
DM
Constant
Other
n Code number { 0 to 49 (Decimal)
Function
• Subtracts 1 from the number of times repeated (s) for the FORn (s) instruction of the same code number, then jumps to
FORn (s).
Notes
• This instruction is checked prior to execution, and when there is an error, the following error code is set in the special
internal output WRF001. Also, the CPU error code '34' is set to special internal output WRF000.
CPU error code Special internal output Error code Error description
34 WRF001 H0003 Duplicate definition of NEXT
• If an error is generated during the execution of the instruction, an error code will be set in the special internal outputs R7F3
and WRF015, and the following program will be executed.
Special internal output Error code Error description
R7F3=1 WRF015 H0016 FOR undefined
H0046 FOR nesting overflow
Instruction for use
When
WR0000 > 0
When
WR0000 = 0
WR0000 = 512
WR0001 = 0
FOR 0(WR0000)
TC0(WR0001) = 0
WR0001 = WR0001 + 1
NEXT 0
R000 DIF0
To the next program
• When R000 is turned on, the progress value (TC n) of the timer or counter is
cleared with 0 for 512 points.
• Once the FOR to NEXT starts, the instruction keeps executing until (s) is “0.”
• FOR0 (WR0000) performs instructions after TC0 (WR0001) = 0 while
WR0000>0, subtracts “1” from WR0000 at NEXT0, then jumps to FOR0
(WR0000).
• FOR0 (WR0000) jumps to the next instruction within the current box upon
WR0000 = 0.
NEXT n