Rockwell Automation Allen-Bradley Logix 5000 Series User Manual

Chapter 5
PCCC Commands
86 Rockwell Automation Publication 1756-PM020F-EN-P - January 2019
• The symbol string starts with a NULL character and ends with a
NULL character.
• In the simplest case, the symbol string consists of just the tag
name.
• To address an array, delimit the array indices with square brackets.
The examples depict symbolic addresses.
Example:
Symbolic addresses:
tag_name
tag_name[x]
tag_name[x,y,z]
tag_name[x][y][z]
Important:
The PLC-
5 TYPED READ and TYPED WRITE commands access tags (elements) of SINT, INT, DINT, or
REAL only. The other PLC-5 commands access only INTs, that is, 16-bit words.
Use the PLC-5 file data type that matches the data type of the Logix tag.
See also
CIP data types on page 13
This table lists the addressing examples for PLC-5 PCCC Messages.
To access This entry is specified (1)
Single integer tag named parts PCCCsymbolic parts
The sixth element of the array of REALs named
setpoints
PCCC Logical ASCII $F8:6
PCCC symbolic setpoints[5]
Single integer [2,5,257] of three dimensional array
named profile
PCCC Logical ASCII $N7:2:5:257
PCCC symbolic profile[2,5,257]
Read Modify Write (CMD=0F, 4F; FNC=26)
For each 3-field sequence (address, AND mask, OR mask), this
RMW command performs this procedure.
1.
Copy the specified word.
2. Reset the bits specified in the [AND mask].
3. Set the bits specified in the [OR mask].
4. Write the word back.
Addressing examples

Rockwell Automation Allen-Bradley Logix 5000 Series Specifications

General

Series	Logix 5000
Category	Controller
Programming Languages	Ladder Diagram (LD), Function Block Diagram (FBD), Structured Text (ST), Sequential Function Chart (SFC)
Communication Protocols	EtherNet/IP, ControlNet, DeviceNet
Programming Software	Studio 5000
Supported I/O	Digital, Analog, Specialty (e.g., motion, temperature)
Processor Type	Varies by model (depends on specific model)
Communication Ports	Ethernet, USB, serial (depends on model)
Operating Temperature	0°C to 60°C (32°F to 140°F)
Power Supply	Varies by model (e.g., 24V DC, 120/240V AC)
Certifications	UL, CE, ATEX

Summary

Important user information

Safety Warnings and Definitions

Explains safety icons like WARNING, ATTENTION, and SHOCK HAZARD, and their implications.

Summary of Changes

New or Enhanced Features

Details new or updated information and features introduced in this manual release.

Chapter 1 CIP services

CIP Data Types

Explains atomic, structure, and array data types used in CIP communication.

Services Supported by Logix 5000 Controllers

Lists vendor-specific CIP services that operate on tags within the controller.

Chapter 2 CIP Services and User-created Tags

Step 1: Find user-created controller scope tags

Describes retrieving symbol name and type attributes for controller tags.

Step 3: Determine the structure makeup

Explains how to read template instance attributes for structure details.

Step 4: Determine the data packing

Details understanding how structure members are arranged in memory for access.

Chapter 3 CIP Addressing Examples

Atomic Members of Predefined Data Types

Provides examples of accessing atomic data types using CIP addressing methods.

Access User-Defined Structures

Demonstrates accessing user-defined structures using Symbolic Segment Addressing.

Chapter 4 CIP Over the Controller Serial Port

Unconnected Messaging (UCMM) through PCCC

Details using PCCC command 0B for serial port requests.

Connected Explicit Messages through PCCC

Explains using PCCC command 0A for explicit message connections.

Chapter 5 PCCC Commands

PLC-2 Communication Commands

Describes commands for accessing Logix 5000 tags via PLC-2.

PLC-5 Communication Commands

Details commands for accessing data using PLC-5 addressing methods.

SLC Communication Commands

Covers commands for accessing data using SLC logical addressing.

Rockwell Automation support

Installation assistance

Provides contact details for technical support during product installation.

Documentation feedback

How to provide suggestions for improving the document.