Omron CJ - PROGRAMMING MANUAL 12-2009 Programming Manual page 88

Basic Concepts
Restrictions
1,2,3...
48
5. Output bits can also be used as input bits.
0002
00
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 program 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 N.C. work bit or the ON Condition Flag (Always ON Flag) if
the input must be kept ON at all times.
Unused work bit
ON (Always ON Flag)
0002
00
Input condition must be provided.
MOV
MOV
Section 2-1