Interlock And Interlock Clear - Il(02) And Ilc(03); Interlock And Interlock Clear - Il(02) And Ilc - Omron SYSMAC C2000H Operation Manual

INTERLOCK and INTERLOCK CLEAR – IL(02) and ILC(03)
Example
00002
00003
Indicates
emergency
situation
00004
Reset input
00005
HR 0000
5-8 INTERLOCK and INTERLOCK CLEAR – IL(02) and ILC(03)
Description
Input Unit
A
NEVER
A
Bits used in KEEP are not reset in interlocks. Refer to the 5-7 INTERLOCK
and INTERLOCK CLEAR – IL(02) and ILC(03) for details.
If a HR bit or an AR bit is used, bit status will be retained even during a
power interruption. KEEP(11) can thus be used to program bits that will main-
tain status after restarting the PC following a power interruption. An example
of this that can be used to produce a warning display following a system
shutdown for an emergency situation is shown below. Bits 00002, 00003, and
00004 would be turned ON to indicate some type of error. Bit 00005 would be
turned ON to reset the warning display. HR 0000, which is turned ON when
any one of the three bits indicates an emergency situation, is used to turn ON
the warning indicator through 00500.
S
KEEP(11) can also be combined with TIM to produce delays in turning bits
ON and OFF. Refer to 5-11-1 TIMER – TIM for details.
Ladder Symbol
Ladder Symbol
IL(02) is always used in conjunction with ILC(03) to create interlocks. Inter-
locks are used to enable branching in the same way as can be achieved with
TR bits, but treatment of instructions between IL(02) and ILC(03) differs from
that with TR bits when the execution condition for IL(02) is OFF. If the execu-
tion condition of IL(02) is ON, the program will be executed as written, with
an ON execution condition used to start each instruction line from the point
where IL(02) is located through the next ILC(03). Refer to 4-6-7 Branching
Instruction Lines for basic descriptions of both methods.
If the execution condition for IL(02) is OFF, the interlocked section between
IL(02) and ILC(03) will be treated as shown in the following table:
S
KEEP(11)
HR 0003
R
Address Instruction
00000 LD
KEEP(11)
00001 OR
HR 0000
00002 OR
00003 LD
00004 KEEP(11)
00005 LD
00006 OUT
R
Activates
warning
00500
display
Section 5-8
Operands
00002
00003
00004
00005
HR 0000
HR 0000
00500
IL(02)
ILC(03)
113