Chapter 5 Instruction Specifications
5-107
Item number
Control instructions-7
Name
NEXT
Ladder format
Condition code
Processing time (
µ
s)
Remark
R7F4
R7F3
R7F2
R7F1
R7F0
Average Maximum
NEXT n
DER
ERR
SD
V
C
z
1]
z
z
z
Instruction format
Number of steps
38
Condition
Steps
NEXT n
2
Bit
Word
Double word
Usable I/O
X
Y
R,
M
TD, SS,
CU, CT
WX WY
WR,
WM TC DX DY
DR,
DM
C
o
nstant
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 = 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.
N
EXT
n
Summary of Contents for HIDIC MICRO-EH
Page 1: ...HITACHI PROGRAMMABLE CONTROLLER APPLICATION MANUAL NJI 350B X ...
Page 12: ...MEMO ...
Page 14: ...Chapter 1 Features 1 2 MEMO ...
Page 50: ...Chapter 4 Product lineup and wiring 4 18 MEMO ...
Page 196: ...Chapter 5 Instruction Specifications 5 146 ...
Page 263: ...Chapter 11 Communication Specifications 11 10 MEMO ...