Interlocks - Omron SYSMAC CV Series Operation Manual

Branching Instruction Lines

4-5-2 Interlocks

90
Note Although simplifying programs is always a concern, the order of execution of
instructions is sometimes important. For example, a MOVE instruction may be
required before the execution of a BINARY ADD instruction to place the proper
data in the required operand word. Be sure that you have considered execution
order before reorganizing a program to simplify it.
0000
TR0
00
0000
00
0000
00
0000 0000
TR0
01 02
0000
04
0000 0000
01 02
0000
00
0000 0000
01 04
The problem of storing execution conditions at branching points can also be
handled by using the INTERLOCK (IL(002)) and INTERLOCK CLEAR
(ILC(003)) instructions to eliminate the branching point completely while allow-
ing a specific execution condition to control a group of instructions. The INTER-
LOCK and INTERLOCK CLEAR instructions are always used together.
When an INTERLOCK instruction is placed before a section of a ladder pro-
gram, the execution condition for the INTERLOCK instruction will control the
execution of all instruction up to the next INTERLOCK CLEAR instruction. If the
execution condition for the INTERLOCK instruction is OFF, all right-hand
instructions through the next INTERLOCK CLEAR instruction will be executed
with OFF execution conditions to reset the entire section of the ladder diagram.
The effect that this has on particular instructions is described in 5-8 INTERLOCK
and INTERLOCK CLEAR – IL(002) and ILC(003) .
0000
01
0000
01
0000
03
0000
03
Section 4-5
Instruction 1
Instruction 2
Instruction 2
Instruction 1
Instruction 1
Instruction 2
Instruction 1
Instruction 2