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Reference
Manual
DF1 Protocol and
Command Set
AllenBradley
Because of the variety of uses for the products described in this
publication, those responsible for the application and use of this
control equipment must satisfy themselves that all necessary steps
have been taken to assure that each application and use meets all
performance and safety requirements, including any applicable laws,
regulations, codes and standards.
The illustrations, charts, sample programs and layout examples
shown in this guide are intended solely for purposes of example.
Since there are many variables and requirements associated with any
particular installation, Allen-Bradley does not assume responsibility
or liability (to include intellectual property liability) for actual use
based upon the examples shown in this publication.
Allen-Bradley publication SGI-1.1, Safety Guidelines for the
Application, Installation, and Maintenance of Solid-State Control
(available from your local Allen-Bradley office), describes some
important differences between solid-state equipment and
electromechanical devices that should be taken into consideration
when applying products such as those described in this publication.
Reproduction of the contents of this copyrighted publication, in
whole or in part, without written permission of Allen-Bradley
Company, Inc., is prohibited.
Throughout this manual we use notes to make you aware of safety
considerations:
!
ATTENTION: Identifies information about practices
or circumstances that can lead to personal injury or
death, property damage or economic loss.
Attention statements help you to:
• identify a hazard
• avoid the hazard
• recognize the consequences
Important: Identifies information that is critical for successful
application and understanding of the product.
PLC-5, DH+, PLC-2, PLC-3, PLC, SLC 500, SLC, SLC 5/01, SLC 5/02, SLC 5/03, SLC 5/04, ControlNet, MicroLogix, and
PLC-2/15 are trademarks of Allen-Bradley Company, Inc.
All other trademarks are property of their respective companies.
Important User
Information
Summary of Changes
Publication
17706.5.16 - October 1996
What's Changed in This
Document
This document contains important information concerning the DF1
Protocol and Command Set Reference Manual.
This information extends and explains information provided in the
Data Highway/Data Highway Plust/DH-485 Communication
Protocol and Command Set Reference Manual, publication
1770-6.5.16 — November 1991
Changes to this document are indicated by a revision bar in the
margin.
The “look and feel” of your Allen-Bradley documentation has
changed! We’re constantly trying to improve our documentation to
make it more usable for you. If you have questions or comments
about this document, complete the enclosed Publication Problem
Report. In addition, we’ve also made the following changes to
publication 1770-6.5.16:
Change Description Reference
organization
We've reorganized the reference manual to make it easier to find
information. We include a map" of this new organization.
Preface, page P-2
commands
We've added and updated the communication commands. We've
also organized them alphabetically. Additional commands include:
•apply port configuration
•change mode
•close file
•disable forces
•get edit resources
•initialize memory
•open file
•protected typed logical read with three address fields
•protected typed logical write with three address fields
•read diagnostic counters
•read section size
•return edit resource
Chapter 7, Communication Commands"
About This Document
Changes to This
Document
What's Changed in This Document soc-i. . . . . . . . . . . . . .
About This Document soc-i. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Changes to This Document soc-i
. . . . . . . . . . . . . . . . . . . . . . . . .
About This Manual P-1. . . . . . . . . . . . . . . . . . . . . . . . . . .
Purpose of This Manual P-1. . . . . . . . . . . . . . . . . . . . . . . . . . .
Who Should Use This Manual P-1
. . . . . . . . . . . . . . . . . . . . . . .
What This Manual Contains P-2
. . . . . . . . . . . . . . . . . . . . . . . .
Terms and Abbreviations P-3
. . . . . . . . . . . . . . . . . . . . . . . . . .
Related
Publications
P-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Related Products P-4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Conventions Used in This Manual P-5
. . . . . . . . . . . . . . . . . . . .
Network Layers 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Physical Layer 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DF1 Link 1-2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Network Link 1-2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DH Link 1-3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DH+ Link 1-5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DH485 Link 1-6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Software Layers 1-7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Datalink Layer 1-7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Application Layer 1-8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Message Packet Structure 1-9
. . . . . . . . . . . . . . . . . . . . . . . . .
Command and Reply Message 1-9
. . . . . . . . . . . . . . . . . . . .
Message Priority 1-10
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Delivery Order of Commands 1-10
. . . . . . . . . . . . . . . . . . . . .
Types of Commands 1-11
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Error Codes 1-11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Understanding DF1 Protocol 2-1. . . . . . . . . . . . . . . . . . .
DF1 Protocol 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Halfduplex Protocol 2-2
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fullduplex Protocol 2-4
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Character Transmission 2-5
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmission Symbols 2-6
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents
Table of Contentsii
Using Halfduplex Protocols to Send and
Receive Messages 3-1. . . . . . . . . . . . . . . . . . . . . . .
Halfduplex Protocol Message Transmission 3-2. . . . . . . . . . . .
Transmitter and Receiver Message Transfer 3-3
. . . . . . . . . . . .
Halfduplex Protocol Environment 3-3
. . . . . . . . . . . . . . . . . . . .
Message Characteristics 3-7
. . . . . . . . . . . . . . . . . . . . . . . . . .
Master
Polling Responsibilities
3-7. . . . . . . . . . . . . . . . . . . . . .
Duplicate
Detection
3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inactive
Slave Polling
3-7. . . . . . . . . . . . . . . . . . . . . . . . . . .
Full Sinks 3-8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Simplified Network Layer 3-8
. . . . . . . . . . . . . . . . . . . . . . . .
Slave Transceiver Actions 3-9
. . . . . . . . . . . . . . . . . . . . . . . . . .
HalfDuplex Protocol Diagrams 3-11
. . . . . . . . . . . . . . . . . . . . . .
Normal Message Transfer 3-12
. . . . . . . . . . . . . . . . . . . . . . . .
Message T
ransfer with Invalid BCC/CRC
3-12. . . . . . . . . . . . .
Message Transfer with ACK Destroyed 3-13
. . . . . . . . . . . . . .
Poll with No Message Available 3-13
. . . . . . . . . . . . . . . . . . . .
Poll with Message Returned 3-14
. . . . . . . . . . . . . . . . . . . . . .
Duplicate Message Transmission 3-15
. . . . . . . . . . . . . . . . . .
Message Sink Full, Case 1 3-16
. . . . . . . . . . . . . . . . . . . . . . .
Message Sink Full, Case 2 3-17
. . . . . . . . . . . . . . . . . . . . . . .
Using Fullduplex Protocol to Send and
Receive Messages 4-1. . . . . . . . . . . . . . . . . . . . . . .
Fullduplex Protocol Message Transmission 4-2. . . . . . . . . . . . .
Fullduplex Protocol Environment 4-3
. . . . . . . . . . . . . . . . . . . .
Message Characteristics 4-4
. . . . . . . . . . . . . . . . . . . . . . . . . .
Transmitter and Receiver Message Transfer 4-4
. . . . . . . . . . . .
How the Transmitter Operates 4-5
. . . . . . . . . . . . . . . . . . . . .
How the Receiver Operates 4-7
. . . . . . . . . . . . . . . . . . . . . .
Fullduplex Protocol Diagrams 4-10
. . . . . . . . . . . . . . . . . . . . . . .
Normal Message Transfer 4-10
. . . . . . . . . . . . . . . . . . . . . . . .
Message Transfer with NAK 4-11
. . . . . . . . . . . . . . . . . . . . . .
Message Transfer with T
imeout and ENQ
4-12. . . . . . . . . . . . .
Message Transfer with ReTransmission 4-13
. . . . . . . . . . . . .
Message Transfer with Message Sink Full 4-14
. . . . . . . . . . . .
Message Transfer with NAK on Reply 4-15
. . . . . . . . . . . . . . .
Message Transfer with Timeout and ENQ for the Reply 4-16
. . .
Message Transfer with Message Source Full on the Reply 4-17
.
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