Rockwell Automation 1761-HHP-B30 MicroLogix 1000 with Hand-Held Programmer (HHP) - Manual (Page 123)

Chapter 8
Using Basic Instructions
8–4
Using AND
Use the AND instruction for normally open contacts placed in series with
any previous input instruction in the current rung or block.
Entering the Instruction
You enter the instruction from within the program monitor functional area.
P 0 0 0
I / 7 0
Using OR
Use the OR instruction for normally open contacts placed in parallel with any
previous input instruction in the current rung or block.
Entering the Instruction
You enter the instruction from within the program monitor functional area.
P 0 0 0
B / 0 1
LDI, ANI, and ORI are all normally closed instructions used in your ladder
program to determine if a bit is Off. When the instruction is executed, if the
bit addressed is off (0), then the instruction is evaluated as true. When the
instruction is executed, if the bit addressed is on (1), then the instruction is
evaluated as false.
Bit Address State LDI, ANI, and ORI Instruction
0 True
1 False
Examples of devices that turn on or off include:
•
motor overload normally closed (N.C.) wired to an input (I/10)
•
an output wired to a pilot light (addressed as O/4)
•
a timer controlling a light (addressed as T3/DN)
8
AND
To access the AND instruction, press:
9
OR
To access the OR instruction, press:
1.54
False True
1.72 LDI
1.94 2.12 ANI
]/[
Execution Times (
µ
sec) when:
Ladder representation:
1.94 2.12 ORI
Load Inverted (LDI),
And Inverted (ANI), and
Or Inverted (ORI)