1 Introduction In This Chapter. . . .

1 Introduction In This Chapter. . . .
Introduction
In This Chapter. . . .
— Manual Overview
— Introduction to PROFIBUS
11
1–2
Introduction
Introduction
Manual Overview
Overview of this
Manual
This manual describes the installation and
operation of the H2–PBC Profibus Slave
Base Controller. You will find the
necessary information for installing and
configuring the module for use on a
Profibus network.
Supplemental
Manuals
The following manuals are essential to the proper use of your H2 Profibus Slave
Base Controller.
• DL205 Installation and I/O Manual part number D2–INST–M
• The PLC/PC software manual
• The PROFIBUS software (if separate) manual
• The PROFIBUS networks manual
If you have a working knowledge of the PROFIBUS network, the PROFIBUS
software and PLC or PC which you are using, this manual will help you configure and
install your H2–PBC Profibus Slave Base Controller.
Who Should Read
this Manual
Installation and
Safety Guidelines
Technical Support
We strive to make our manuals the best in the industry and rely on your feedback in
reaching our goal. If you cannot find the solution to your particular application, or, if
for any reason you need additional technical assistance, please call us at
770–844–4200.
Our technical support team is glad to work with you in answering your questions.
They are available weekdays from 9:00 a.m. to 6:00 p.m. Eastern Time. We also
encourage you to visit our website where you can find technical and nontechnical
information about our products and our company.
www.automationdirect.com
H2–PBC Profibus Slave Base
Controller Manual, 1st Ed, Rev A
1–3
Introduction
Symbols Used
Introduction
The “light bulb” icon in the left-hand margin indicates a tip or shortcut.
The “note pad” icon in the left–hand margin indicates a special note.
The “exclamation mark” icon in the left-hand margin indicates a warning or caution.
These are very important because the information may help you prevent serious
personal injury or equipment damage.
Key Topics for
Each Chapter
The beginning of each chapter will list the
key topics that can be found in that
chapter.
1
Installation and
Safety Guidelines
H2–PBC Profibus Slave Base
Controller Manual, 1st Ed, Rev A
1–4
Introduction
Introduction
Introduction to Profibus
Installation and
Safety Guidelines
PROFIBUS
Concepts
Profibus (Process Field Bus) is a vendor–independent, open field bus standard that
is supported by leading manufacturers of automation products. A host of certified
Profibus products are available, offering an array of products including sensors,
motor drives and starters, PLCs, remote I/O systems, etc.
Here are some Profibus concepts that you may find helpful.
• Profibus offers three types of profiles.
• Process Automation (PA)
• Fieldbus Message Specification (FMS) communication profile
• Decentralized Periphery (DP)
• Profibus – DP is the most frequently used communication profile.
• The H2–PBC is a DP slave
• Master and slave devices, max. 126 stations on one bus
• Connection oriented communication
• Transmission rate up to 12 Mbps
• Peer–to–peer (user data communication) or multicast (control
commands)
• Cyclic master–slave user data communication
• Control commands allow synchronization of I/O
• Methods for diagnostic and error detection are built into the system
PROFIBUS
International
PROFIBUS International (PI) maintains the PROFIBUS standard and provides
certification to EN 50170 and IEC 61158 standards for devices. The main purpose of
certification is to provide users with the assurance that devices from different
manufactures will work in the same network. Certification is issued by the
PROFIBUS Certification Centre in Karlsruhe, Germany.
PROFIBUS Nutzerorganisation e.V.
Haid–und–Neu–StraBe 7
D–76131 Karlsruhe
Phone ++49 721 96 58 590, Fax ++49 721 96 58 589
PROFIBUS_International@compuserve.com
PROFIBUS Trade
Organization
The PROFIBUS Trade Organization (PTO) is a member of PROFIBUS
International. For more detailed information about Profibus, visit the PTO website
where technical descriptions and Profibus specifications are available.
PROFIBUS Trade Organization
16101 N. 82nd Street, Suite 3B
Scottsdale, AZ 85260
Phone 480–483–2456, Fax 480–483–7202
Their website is: www.profibus.com
H2–PBC Profibus Slave Base
Controller Manual, 1st Ed, Rev A
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Introduction
DP Communication Profile
Introduction
The DP Communication Profile is designed for efficient data excahnge at the field
level. The central automation devices, such as PLC/PC or process control systems,
communicate through a fast serial connection with distributed field devices which
can be I/O, drives and valves, as well as measuring transducers. Data exchange
with the distributed devices is mainly cyclic.
The master controller cyclically reads the input information from the slaves and
cyclically writes the output information to the slaves. The bus cycle time should be
shorter than the program cycle time of the central automation system, which for
many applications is approximately 10 msec. In addition to cyclic user data
transmission, DP provides powerful functions for diagnostics and commissioning.
Data communication is monitored by monitoring functions on both the master and
slave side.
DP requires only about 1 msec at 12 Mbit/sec for the transmission of 512 bits of input
data and 512 bits of output data distributed over 32 stations. The chart below shows
the typical time, depending on number of stations and transmission speed.
Transmitting the input and output data in a single message cycle with DP, results in a
significant increase in speed compared to FMS.
Bus Cycle Time
[ms]
18
14
500 kbps
10
1.5 kbps
6
12Mbps
2
10
20
30
Slaves
Bus cycle time of a DP mono–master system.
For a more complete description and specification of the Profibus DP
communication profile. visit the Profibus Trade Organization web site,
www.profibus.com.
H2–PBC Profibus Slave Base
Controller Manual, 1st Ed, Rev A
Installation and
Safety Guidelines
2
1–6
Introduction
Introduction
Mini Glossary
Below is a small glossary of terms used in this manual.
Mono–Master
Multi–Master
Slave
Only one Profibus master active on the bus during
operation of the bus system of which the
H2–PBC is a slave. This can be either a PLC
module or a card in your PC.
Several Profibus masters are connected to one
bus. These masters represent either independent
subsystems or additional configuration and
diagnostic devices.
a peripheral device (I/O devices, drives, HMI,
valves, measuring transducers) which collects
input information and sends output information to
the peripherals. The H2–PBC is a slave which is
also referred to as a controller in a Profibus
I/O sub–system.
Segment
One bus structure with a maximum of 32 stations
(master or slaves) or nodes. A maximum of 9
segments is possible with the use of repeaters.
Station
A node. Can be a master or a slave.
Repeater
An RS485 device that amplifies data signals on
bus lines and is the link between individual bus
segments. Used to increase the number of nodes
or to extend the cable lingth between two nodes.
The unique device address on a Profibus
network. There are a maximum of 126 (0–126).
The master is usually node 0.
The bus access right which is assigned to each
master within a precisely defined timeframe.
Node Address
Installation and
Safety Guidelines
Token
H2–PBC Profibus Slave Base
Controller Manual, 1st Ed, Rev A
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