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If the jump number for JMP(04) is 00, the CPU Unit will look for the next JME(05)
with a jump number of 00. To do so, it must search through the program, causing
a longer cycle time (when the execution condition is OFF) than for other jumps.
The status of timers, counters, bits used in OUT, bits used in OUT NOT, and all
other status controlled by the instructions between JMP(04) 00 and JMP(05) 00
will not be changed. jump number 00 can be used as many times as desired. A
jump from JMP(04) 00 will always go to the next JME(05) 00 in the program. It is
thus possible to use JMP(04) 00 consecutively and match them all with the same
JME(05) 00. It makes no sense, however, to use JME(05) 00 consecutively, be-
cause all jumps made to them will end at the first JME(05) 00.
Although DIFU(13) and DIFD(14) are designed to turn ON the designated bit for
one cycle, they will not necessarily do so when written between JMP(04) and
JME (05). Once either DIFU(13) or DIFD(14) has turned ON a bit, it will remain
ON until the next time DIFU(13) or DIFD(14) is executed again. In normal pro-
gramming, this means the next cycle. In a jump, this means the next time the
jump from JMP(04) to JME(05) is not made, i.e., if a bit is turned ON by DIFU(13)
or DIFD(14) and then a jump is made in the next cycle so that DIFU(13) or
DIFD(14) are skipped, the designated bit will remain ON until the next time the
execution condition for the JMP(04) controlling the jump is ON.
Precautions When JMP(04) and JME(05) are not used in pairs, an error message will appear
when the program check is performed. Although this message also appears if
JMP(04) 00 and JME(05) 00 are not used in pairs, the program will execute prop-
erly as written.
Flags There are no flags affected by these instructions.
Examples Examples of jump programs are provided in 4-7-8 Jumps.
5-12 END – END(01)
Ladder Symbol
END(01)
Description END(01) is required as the last instruction in any program. If there are subrou-
tines, END(01) is placed after the last subroutine. No instruction written after
END(01) will be executed. END(01) can be placed anywhere in the program to
execute all instructions up to that point, as is sometimes done to debug a pro-
gram, but it must be removed to execute the remainder of the program.
If there is no END(01) in the program, no instructions will be executed and the
error message “NO END INST” will appear.
Flags END(01) turns OFF the ER, CY, GR, EQ, and LE Flags.
5-13 NO OPERATION – NOP(00)
NOP(00) is not generally required in programming and there is no ladder symbol
for it. When NOP(00) is found in a program, nothing is executed and the program
execution moves to the next instruction. When memory is cleared prior to pro-
gramming, NOP(00) is written at all addresses. NOP(00) can be input through
the 00 function code.
Flags There are no flags affected by NOP(00).
5-14 Timer and Counter Instructions
TIM and TIMH are decrementing ON-delay timer instructions which require a TC
number and a set value (SV).
CNT is a decrementing counter instruction and CNTR is a reversible counter
instruction. Both require a TC number and a SV. Both are also connected to mul-
tiple instruction lines which serve as an input signal(s) and are reset.
DIFU(13) and DIFD(14) in
Jumps
Description
Timer and Counter Instructions Section 5-14