724
7 APPLICATION INSTRUCTIONS
7.17 Program Control Instructions
Program low speed execution registration
PLOW(P)
• Sets the program whose file name is being stored at the device designated by (S) in low-speed execution type.
• Only the programs stored in the drive No. 0 (program memory/internal RAM) can be set as the low speed execution type.
• Designated programs assume the low speed execution type with END processing.
When programs A, B, and C exist and program A performs "PLOW" of program D. (Assume that the constant scan has been
set.)
• This instruction will be given priority even in cases when a program execution type has been designated in the parameters.
• It is not necessary to designate the extension (.QPG) with the file name. (Only .QPG files will be acted on.)
• In any of the following cases, an operation error occurs, the error flag (SM0) turns ON, and an error code is stored into SD0.
• The following program sets the program with file name ABC as low-speed execution type when X0 is turned ON.
(S): File name of the program to be set as a low speed execution type, or head number of the devices where the file name is stored (character string)
Setting
data
Internal device R, ZR J\ U\G Zn Constant
$
Others
Bit Word Bit Word
(S)
Error
code
Error details Q00J/
Q00/
Q01
QnH QnPH QnPRH QnU LCPU
2410 The program with the specified file name does not exist.
4235 There is a CHK instruction in the program with the specified file name.
[Ladder Mode] [List Mode]
Basic
Redundant
Universal
LCPU
Process
High
performance
Command
Command
PLOW
PLOWP
S
S
PLOW
PLOWP
ABCEND A BCDEND
Scan Scan
Waiting for
constant
Execution of
PLOW
Program D
is executed
Step Instruction Device
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