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Chapter 5 Instruction Specifications
5-104
Syntax of JMP, CJMP
LBL 2
JMP 1
JMP 1
LBL 7
JMP 2
LBL 3
END
SB
JMP 3
LBL 2
JMP 4
RTS
SB
LBL 4
JMP 5
LBL 6
PTS
INTO
JMP 6
LBL 5
JMP 7
LBL 1
RTI
JMP 5
A]
B]
LBL 5
LBL 5
JMP 0
JMP 1
JMP 2
LBL 1
LBL 0
JMP 3
LBL 2
JMP 4
LBL 3
LBL 4
LBL 0
CJMP1(X00000)
JMP 0
LBL 1
JMP 5
JMP 5
CJMP 5
LBL 5
JMP 0
Program A
Program C
Program B
X00000 X00001
X00002
X00003
LBL 0
X00000
X00001
JMP 1
LBL 1
TD0
0.1s
100
X00000
X00001
JMP 1
MCS0
LBL 2
X00002
Y00100
MCR0
Program
Program
1] LBL n with the same code number as the code
number n of the JMP instruction is required.
• If JMP 1 is executed when there
is no LBL 1, an LBL undefined
error occurs. JMP 1 will do
nothing and execute the next
processing of program A.
6] An overlap of JMP instructions with the same code
number is valid.
Program A
Program B
2] Jump is not permitted to outside the area in which the JMP
instruction resides.
7] A startup condition can be programmed with respect to
JMP instructions.
•
When the JMP 1 instruction
is executed, since LBL 1 is
not in the normal scan area,
a "jump outside the area"
error will be generated. The
JMP 1 instruction will do
nothing and execute the next
processing of program.
•
JMP 2 to JMP 7 perform
similar processing.
•
If a jump is performed
from JMP 0 to LBL 0,
programs A, B and C
will not be executed.
3] Code number n of the JMP instruction and the LBL n with
the same code number may not be overlapped.
8] The CJMP instruction also follows the same syntax as 1]
through 7].
Note 1: When a JMP instruction jumps to LBL, the status
of each I/O between JMP and LBL is retained.
However, the timer progress value will be updated.
•
In the pre-operation process, the
label instructions A] and B] have 5
as the code numbers, so a duplicate
definition error will occur.
•
If X00000 turns on after
X00001 turns on, the
progress value of TD0 will
be updated even if a jump
is performed from JMP 1
to LBL 1. If X00000
remains on, TD0 will not
turn on even if its progress
value exceeds 100.
4] Nesting of JMP instructions is allowed.
5] The JMP instruction can jump to a location before the
instruction itself.
Note 2: If the JMP instruction is used in conjunction with
the MCS or MCR instruction, the following actions
will result, so exercise caution when programming.
Note 3: Do not create a circuit that jumps to outside from
between MCS and MCR.
•
When JMP 2 does not
jump, Y00100 will turn on
when X00001 and X00002
are both on.
•
When JMP 2 does jump, if
X00000 is on, Y00100 will
follow the on/off of
X00002 regardless of the
on/off of X00001.
•
JMP 0 will jump to LBL 0, which is a
location before the JMP instruction.
•
When input X00000 turns on, the loop
between LBL 0 and JMP 0 is escaped
by jumping from CJMP 1 (X00000) to
LBL 1.
•
If there is no instruction as CJMP 1
(X00000) to escape from the loop, the
loop from LBL 0 to JMP 0 will
continue endlessly.
Program head
Normal scan area
Subroutine area
Subroutine area
Interrupt scan area
Startup condition
CJMP n (s)