Hitachi NT2021XA, Instruction Manual

Page: 19 / 84

Chapter 2 Syntax
2-3
2.2 List of Instructions
This section lists the instructions that can be used in a program.
(1) Program control instructions
Instruction
name
Instruction format
Description
Mnemonic code Parameter 1 Parameter 2 Parameter 3 Parameter 4 Parameter 5
entry
statement
entry
Indicates the beginning of the main
program.
end
Indicates the end of the main program.
sub
statement
sub
<subroutine
name>
Indicates the beginning of a subroutine.
end sub
Indicates the end of a subroutine.
call
statement
call
<subroutine
name> Branches processing to the subroutine
specified by <subroutine name>.
for loop
statement
for
<variable> <start value> <end value>
<incremental
value>
Executes <instruction set> repeatedly until
<variable> reaches <end value>. Note that
<variable>, which initially contains <start
value>, is incremented by <incremental
value> each time <instruction set> is
executed.
<instruction set>
Indicates the instructions to be executed
repeatedly.
next Ends the “for” loop.
goto
statement
goto <label name>
Branches processing unconditionally to the
step labeled with <label name>.
on trip goto
statement
on trip goto <label name>
Branches processing to the step labeled
with <label name> when the inverter trips.
if statement
if <condition>
VJGP
<label name>
Branches processing to the step labeled
with <label name> when the <condition> is
met.
structured if
ifs <condition> Starts the structured if statement.
then
Indicates the beginning of instructions to be
executed when <condition> is met.
<instruction set>
Indicates the instructions to be executed
when <condition> is met.
else
Indicates the beginning of instructions to be
executed when <condition> is not met.
<instruction set>
Indicates the instructions to be executed
when <condition> is not met.
end if Ends the structured if statement.
select case
syntax
statement
select
<conditional
variable>
Executes the instructions specified after
“case” when the value of <conditional
variable> is <conditional value>.
case
<conditional
value> Indicates the conditional value and the
beginning of instructions to be executed.
[case else]
Indicates the beginning of instructions to be
executed when the value of <conditional
variable> is not <conditional value>.
end select
Ends the select case syntax statement.
until loop
statement
until
<condition>
Executes <instruction set> repeatedly until
<condition> is met.
<instruction set>
Indicates the instructions to be executed
while <condition> is not met.
loop Ends the “until” loop.
wait loop
statement
wait ***.**
Waits for “***.**” seconds.
<variable>
Waits for <variable> × 10ms.
<condition> Waits until <condition> is met.
while loop
statement
while
<condition>
Executes <instruction set> while
<condition> is met.
<instruction set>
Indicates the instructions to be executed
while <condition> is met.
wend
Ends the “while” loop.
inc
statement
inc <variable> Increments the value of <variable> by 1.
dec
statement
dec
<variable> Decrements the value of <variable> by 1.