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Sequence Control Instructions Section 3-4
Description When the execution condition for MILH(517) (or MILR(518)) with interlock
number N is OFF, the outputs for all instructions between that MILH(517)/
MILR(518) instruction and the next MILC(519) with interlock number N are
interlocked.
When the execution condition for MILH(517) (or MILR(518)) with interlock
number N is ON, the instructions between that MILH(517)/MILR(518) instruc-
tion and the next MILC(519) with interlock number N are executed normally.
Interlock Status
The following table shows the treatment of various outputs in an interlocked
section between MILH(517)/MILR(518) instruction and the next MILC(519).
Note Bits and words in all other instructions including TTIM(087), TTIMX(555),
MTIM(543), MTIMX(554), SET, RSET, CNT, CNTX(546), CNTR(012),
CNTRX(548), SFT, and KEEP(011) retain their previous status.
The MILH(517)/MILR(518) instruction turns OFF the Interlock Status Bit
(operand D) when the interlock is in engaged and turns ON the bit when the
interlock is not engaged. Consequently, the Interlock Status Bit can be moni-
tored to check whether or not the interlock for a given interlock number is
engaged.
Nesting
Interlocks are nested when an interlocked program section (MILH(517)/
MILR(518) and MILC(519) combination) is placed within another interlocked
program section (MILH(517)/MILR(518) and MILC(519) combination). Inter-
locks can be nested up to 16 levels.
Nesting can be used for the following kinds of applications.
Instruction Treatment
Bits specified in OUT, OUT NOT, or OUTB(534) OFF
TIM, TIMX(550), TIMH(015),
TIMHX(551), TMHH(540),
TMHHX(552), TIML(542), and
TIMXL(553)
Completion Flag OFF (reset)
PV Time set value (reset)
Bits/words specified in all other instructions (See note.) Retain previous status.
MILH
n
d
MILC
n
Input condition
Interlocked program
section
Input condition ON
(Normal operation)
Input condition OFF
Normal
operation
Interlock
Status Bit
(d) ON
Outputs interlocked.
(Outputs OFF,
timers reset, etc.)
Interlock Status Bit
(d) OFF
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