1 Publication 1756-RM005A-EN-E - March 2000
Reference Manual
Logix5000 Data Access
Purpose
This documents describes how to access data from a Logix5000
controller using the following methods:
• CIP Services (inherent Logix5000 mode of communications)
• Programmable Controller Communication Commands (PCCC),
for compatibility with PLC and SLC controllers:
– PLC-2 Commands
– PLC-5 Commands
– SLC Commands
When to Use this Document
Use this document when you need to write data to or read data from
a Logix5000 controller via an external device.
How to Use this Document
This document uses the following acronyms and definitions:
For additional information, refer to the DF1 Protocol and Command
Set Reference Manual, publication 1770-6.5.16.
This term: Means:
PLC-5 a type of Allen-Bradley Programmable Logic Controller
PLC-2 an older type of Allen-Bradley Programmable Logic Controller
SLC an Allen-Bradley Small Logic Controller
CIP Control and Information Protocol
GEN STS CIP message general status
IOI Internal Object Identifier (I.e., How to address data in CIP messaging.)
segment Part of an IOI
tag character name of data
STS / EXT STS status of the message transmission
TNS 16 bit unique transaction identifier
address offset a 2 byte field which indicates byte offset from the start of a file or tag
system address a multi-byte field which indicates where to start the operation
packet offset indicates how much further from system address to continue the operation
total transaction indicates total extent of intended operation
- 1
- 2
- 3
前往页