Omron CJ - INSTRUCTIONS User Manual

1. Basic Understanding of Instructions
10
CS/CJ/NSJ Series Instructions Reference Manual (W474)
Differentiated Instructions
• A differentiated instruction has an internal flag that tells whether the previ-
ous value is ON or OFF. At the start of operation, the previous value flags
for upwardly differentiated instruction (DIFU and @ instructions) are set to
ON and the previous value flags for downwardly differentiated instructions
(DIFD and % instructions) are set to OFF. This prevents differentiation
outputs from being output unexpectedly at the start of operation.
• An upwardly differentiated instruction (DIFU or @ instruction) will output
ON only when the execution condition is ON and flag for the previous
value is OFF.
■ Using Differentiated Instructions in Interlocks (IL - ILC Instructions)
In the following example, the previous value flag for the differentiated instruc-
tion maintains the previous interlocked value and will not output a differenti-
ated output at point A because the value will not be updated while the
interlock is in effect.
■ Using Differentiated Instructions in Jumps (JMP(004) - JME(005)
Instructions)
Just as for interlocks, the previous value flag for a differentiated instruction is
not changed when the instruction is jumped, i.e., the previous value is main-
tained.
• With downwardly differentiated instructions (DIFD(014) or instructions
with a %), outputs will turn ON when inputs turn OFF only when the previ-
ous value flag is ON.
• With both upwardly and downwardly differentiated instructions, outputs
will turn OFF in the next cycle.
Note Do not use the Always P_On Flag or A200.11 (First Cycle Flag) as the input
bit for an upwardly differentiated instruction. Do not use the Always P_Off Flag
as the input bit for a downwardly differentiated instruction. If either is used, the
instruction will never be executed.
IL
ILC
DIFU
001000
0.00
0.01
000000
000001
001000
IL is
executing
IL is
executing

Omron CJ - INSTRUCTIONS Specifications

General

Brand	Omron
Model	CJ - INSTRUCTIONS
Category	Controller
Language	English