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Basic Concepts Section 2-1

3. An input bit must always be inserted before and never after an output in-

struction like an output bit. If it is inserted after an output instruction, then

a location error will occur during a Programming Device program check.

4. The same output bit cannot be programmed in an output instruction more

than once. If it is, a duplicate output bit error will occur and output instruc-

tion programmed first will not operate. The results of the second rung will

be output.

5. An input bit cannot be used in an OUTPUT instruction (OUT).

6. The total number –1 of LD/LD NOT instructions minus one indicating logi-

cal starts must match the total number of AND LD and OR LD instructions

connecting the instruction blocks. If they do not match, then a rung error

will occur during a Programming Device program check.

7. An END(001) instruction must be inserted at the end of the program in

each task.

• If a program without an END(001) instruction starts running, a program

error indicating No End Instruction will occur, the ERR/ALM LED on the

front of the CPU Unit will light, and the program will not be executed.

• If a program has more than one END(001) instruction, then the program

will only run until the first END(001) instruction.

0002

0000

0002

0000

(Output bit)

0000

(Input bit)

Example

LD A 3

OR B

LD C

OR D

AND LD 2

LD E

OR F

AND LD

OUT G

Omron CJ1M-CPU series Programming Manual

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