Omron CJ1G-CPU series, Programming Manual

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Basic Concepts Section 2-1
5. Output bits can also be used as input bits.
Restrictions
1,2,3... 1.A ladder program must be closed so that signals (power flow) will flow
from the left bus bar to the right bus bar. A rung error will occur if the pro-
gram is not closed (but the program can be executed).
2. Output bits, timers, counters and other output instructions cannot be con-
nected directly to the left bus bar. If one is connected directly to the left bus
bar, a rung error will occur during the programming check by a Program-
ming Device. (The program can be executed, but the OUT and MOV(021)
will not be executed.)
Insert an unused input N.C. work bit or an ON Flag (Always ON Flag) as a
dummy if the input must be kept ON at all times.
0002
00
0002
00
MOV
Input condition must be provided.
Unused work bit
ON (Always ON Flag)
MOV