Rockwell-automation Logix5000 Controllers Ladder Diagram Programming M Manual de usuario descargar pdf (Pagina 12)

Chapter 1 Program ladder diagram

• Logix5000 Controllers General Instructions Reference Manual,

publication 1756-RM003

• Logix5000 Controllers Process and Drives Instructions Reference

Manual, publication 1756-RM006

• Logix5000 Controllers Motion Instruction Set Reference Manual,

publication 1756-RM007

Tip: I/O module data updates asynchronously to the execution of logic. If you reference an input multiple times in

your logic, the input could change state between separate references. If you need the input to have the same

state for each reference, buffer the input value and reference that buffer tag.

You can also use Input and Output program parameters which automatically buffer the data during logix

execution. See the Logix5000 Controllers Program Parameters Programming Manual, publication 1756-PM021.

The examples in this chapter use two simple instructions to help you learn how to

write ladder diagram logic. The rules that you learn for these instructions apply to

all other instructions.

Symbol Name Mnemonic Description

Examine If Closed XIC An input instruction that looks at one bit of data.

If the bit is

Then the instruction

(rung-condition-out) is

On (1) True

Off (0) False

Output Energize OTE An output instruction that controls one bit of data.

If the instructions to the left

(rung-condition-in) are

Then the instruction turns the bit

True On (1)

False Off (0)

12 Rockwell Automation Publication 1756-PM008E-EN-P - October 2014

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Rockwell-automation Logix5000 Controllers Ladder Diagram Programming M Manual de usuario Pagina 12