Omron C200HW-PRM21 Operation Manuals
PROFIBUS-DP Master Unit
OPERATION MANUAL
Cat. No. W349-E2-2
C200HW-PRM21
C200HW-PRM21
PROFIBUS-DP Master Unit
Operation Manual
Produced May 2000
iv
Notice:
!
Caution
!
DANGER!
!
WARNING
OMRON products are manufactured for use according to proper procedures by a qualified operator
and only for the purposes described in this manual.
The following conventions are used to indicate and classify precautions in this manual. Always heed
the information provided with them. Failure to heed precautions can result in injury to people or damage to the product.
Indicates information that, if not heeded, is likely to result in loss of life or serious injury.
Indicates information that, if not heeded, could possibly result in loss of life or serious injury.
Indicates information that, if not heeded, could result in relatively serious or minor injury,
damage to the product, or faulty operation.
OMRON Product References
All OMRON products are capitalised in this manual. The word “Unit” is also capitalised when it refers to
an OMRON product, regardless of whether or not it appears in the proper name of the product.
The abbreviation “Ch,” which appears in some displays and on some OMRON products, often means
“word” and is abbreviated “Wd” in documentation in this sense.
The abbreviation “PLC” means Programmable Logic Controller and is not used as an abbreviation for
anything else.
Visual Aids
The following headings appear in the left column of the manual to help you locate different types of
information.
OMRON, 2000
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any
form, or by any means, mechanical, electronic, photocopying, recording, or otherwise, without the prior written
permission of OMRON.
No patent liability is assumed with respect to the use of the information contained herein. Moreover, because OMRON is
constantly striving to improve its high-quality products, the information contained in this manual is subject to change
without notice. Every precaution has been taken in the preparation of this manual. Nevertheless, OMRON assumes no
responsibility for errors or omissions. Neither is any liability assumed for damages resulting from the use of the
information contained in this publication.
Note Indicates information of particular interest for efficient and convenient operation
of the product.
1, 2, 3…Indicates lists of one sort or another, such as procedures, checklists, etc.
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TABLE OF CONTENTS
PRECAUTIONS .........................................................................................xi
1 Intended Audience........................................................................................................................................................xii
2 General Precautions......................................................................................................................................................xii
3 Safety Precautions ........................................................................................................................................................xii
4 Operating Environment Precautions.............................................................................................................................xii
5 Application Precautions...............................................................................................................................................xiii
6 EC Directives ..............................................................................................................................................................xiv
1 PROFIBUS-DP......................................................................................1
1-1 Introduction..............................................................................................................................................................2
1-2 Protocol architecture ................................................................................................................................................2
1-3 Device types.............................................................................................................................................................4
1-4 PROFIBUS-DP characteristics.................................................................................................................................4
1-5 Device Data Base files .............................................................................................................................................8
1-6 Profiles.....................................................................................................................................................................8
2 INSTALLATION.................................................................................. 9
2-1 Physical layout of the unit......................................................................................................................................10
2-2 Mounting the C200HW-PRM21 ............................................................................................................................13
2-3 Setting up a network...............................................................................................................................................14
3 SPECIFICATIONS AND PERFORMANCE..................................17
3-1 Overall Specifications............................................................................................................................................18
3-2 Performance ...........................................................................................................................................................20
4 CONFIGURATOR.............................................................................29
4-1 General...................................................................................................................................................................30
4-2 Setup ......................................................................................................................................................................31
4-3 Operation................................................................................................................................................................32
4-4 Debug mode...........................................................................................................................................................46
5 PLC INTERFACE..............................................................................51
5-1 Unit Settings...........................................................................................................................................................52
5-2 Input / Output Mailbox...........................................................................................................................................59
5-3 Control and status area...........................................................................................................................................60
5-4 LEDs ......................................................................................................................................................................70
6 MESSAGE COMMUNICATION, IOWR / IORD .........................73
6-1 Message communication........................................................................................................................................74
6-2 IOWR.....................................................................................................................................................................74
6-3 IORD......................................................................................................................................................................76
6-4 Messages................................................................................................................................................................77
7 TROUBLESHOOTING AND MAINTENANCE ...........................83
7-1 Error Indicators ......................................................................................................................................................84
7-2 Troubleshooting .....................................................................................................................................................84
7-3 Maintenance...........................................................................................................................................................90
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Appendices ..................................................................................................93
Appendix A Tips and sample programs....................................................................................................93
Appendix B GSD file for C200HW-PRM21 ..........................................................................................101
Appendix C CS1 PLC series compatibility.............................................................................................103
Index ..........................................................................................................105
Revision History .......................................................................................107
viii
About this Manual:
!
WARNING
This manual describes the installation and operation of the PROFIBUS-DP Master Unit and includes the
sections described below.
Please read this manual carefully and be sure you understand the information provided before attempting to install and operate the PROFIBUS-DP Master Unit. Be sure to read the precautions provided
in the following section.
Section 1 gives a brief description of PROFIBUS-DP.
Section 2 describes the installation of the C200HW-PRM21.
Section 3 describes the overall specifications and the communication performance of the Unit.
Section 4 describes the software for configuring the PROFIBUS-DP network.
Section 5 describes the interface with the user.
Section 6 describes the message communication.
Section 7 describes the troubleshooting procedures and maintenance operations.
Failure to read and understand the information provided in this manual may result in
personal injury or death, damage to the product, or product failure. Please read
each section in its entirety and be sure you understand the information provided in
the section and related sections before attempting any of the procedures or
operations given.
ix
x
PRECAUTIONS
This section provides general precautions for using the PROFIBUS-DP Master Units, Programmable Controllers, and
related devices.
The information contained in this section is important for the safe and reliable application of the PROFIBUS-DP
Master Units. You must read this section and understand the information contained before attempting to set up or
operate a PROFIBUS-DP Master Unit and PLC system.
1 Intended Audience........................................................................................................................................................xii
2 General Precautions......................................................................................................................................................xii
3 Safety Precautions ........................................................................................................................................................xii
4 Operating Environment Precautions.............................................................................................................................xii
5 Application Precautions...............................................................................................................................................xiii
6 EC Directives ..............................................................................................................................................................xiv
xi
Operating Environment Precautions
!
WARNING
!
WARNING
!
WARNING
1 Intended Audience
This manual is intended for the following personnel, who must also have
knowledge of electrical systems (an electrical engineer or the equivalent).
• Personnel in charge of installing FA systems.
• Personnel in charge of designing FA systems.
• Personnel in charge of managing FA systems and facilities.
2 General Precautions
The user must operate the product according to the performance
specifications described in the operation manuals.
Before using the product under conditions which are not described in the
manual or applying the product to nuclear control systems, railroad systems,
aviation systems, vehicles, combustion systems, medical equipment,
amusement machines, safety equipment, and other systems, machines, and
equipment that may have a serious influence on lives and property if used
improperly, consult your OMRON representative.
Make sure that the ratings and performance characteristics of the product are
sufficient for the systems, machines, and equipment, and be sure to provide
the systems, machines, and equipment with double safety mechanisms.
This manual provides information for installing and operating OMRON
PROFIBUS-DP Master Units. Be sure to read this manual before operation
and keep this manual close at hand for reference during operation.
It is extremely important that a PLC and all PLC Units be used for the
specified purpose and under the specified conditions, especially in
applications that can directly or indirectly affect human life. You must consult
with your OMRON representative before applying a PLC system to the above
mentioned applications.
3 Safety Precautions
Never attempt to disassemble any Units while power is being supplied. Doing
so may result in serious electrical shock or electrocution.
Never touch any of the terminals while power is being supplied. Doing so may
result in serious electrical shock or electrocution.
4 Operating Environment Precautions
Do not operate the control system in the following places.
• Where the PLC is exposed to direct sunlight.
• Where the ambient temperature is below 0°C or over 55°C.
• Where the PLC may be affected by condensation due to radical
temperature changes.
• Where the ambient humidity is below 10% or over 90%.
• Where there is any corrosive or inflammable gas.
• Where there is excessive dust, saline air, or metal powder.
• Where the PLC is affected by vibration or shock.
• Where any water, oil, or chemical may splash on the PLC.
xii
Application Precautions
The operating environment of the PLC System can have a large effect on the
!
Caution
!
Caution
!
Caution
!
WARNING
longevity and reliability of the system. Improper operating environments can
lead to malfunction, failure, and other unforeseeable problems with the PLC
System. Be sure that the operating environment is within the specified
conditions at installation and remains within the specified conditions during
the life of the system.
5 Application Precautions
Observe the following precautions when using the PROFIBUS-DP Master
Units or the PLC.
Failure to abide by the following precautions could lead to serious or possibly
fatal injury. Always heed these precautions.
• Always ground the system to 100 Ω or less when installing the system to
protect against electrical shock.
• Always turn OFF the power supply to the PLC before attempting any of the
following. Performing any of the following with the power supply turned ON
may lead to electrical shock:
• Mounting or removing any Units (e.g., I/O Units, CPU Unit, etc.) or
memory cassettes.
• Assembling any devices or racks.
• Connecting or disconnecting any cables or wiring.
Failure to abide by the following precautions could lead to faulty operation of
the PLC or the system or could damage the PLC or PLC Units. Always heed
these precautions.
• Use the Units only with the power supplies and voltages specified in the
operation manuals. Other power supplies and voltages may damage the
Units.
• Take measures to stabilise the power supply to conform to the rated supply
if it is not stable.
• Provide circuit breakers and other safety measures to provide protection
against shorts in external wiring.
• Do not apply voltages exceeding the rated input voltage to Input Units. The
Input Units may be destroyed.
• Do not apply voltages exceeding the maximum switching capacity to Output
Units. The Output Units may be destroyed.
• Always disconnect the LG terminal when performing withstand voltage
tests.
• Install all Units according to instructions in the operation manuals. Improper
installation may cause faulty operation.
• Provide proper shielding when installing in the following locations:
• Locations subject to static electricity or other sources of noise.
• Locations subject to strong electromagnetic fields.
• Locations subject to possible exposure to radiation.
• Locations near power supply lines.
• Be sure to tighten Backplane screws, terminal screws, and cable connector
screws securely.
• Do not attempt to take any Units apart, to repair any Units, or to modify any
Units in any way.
The following precautions are necessary to ensure the general safety of the
system. Always heed these precautions.
• Provide double safety mechanisms to handle incorrect signals that can be
xiii
6 EC Directives
generated by broken signal lines or momentary power interruptions.
• Provide external interlock circuits, limit circuits, and other safety circuits in
addition to any provided within the PLC to ensure safety.
PROFIBUS-DP Master Units that meet EC directives also meet the common
emission standard (EN50081-2). When PROFIBUS-DP Master Units are built
into equipment, however, the measures necessary to ensure that the
standard is met will vary with the overall configuration, the other devices
connected, and other conditions. You must therefore confirm that EC
directives are met for the overall machine or device.
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xiv
1 PROFIBUS-DP
This section gives a brief description of PROFIBUS-DP.
1-1 Introduction................................................................................................................................................................2
1-2 Protocol architecture ..................................................................................................................................................2
1-3 Device types...............................................................................................................................................................4
1-4 PROFIBUS-DP characteristics ..................................................................................................................................4
1-4-1 Bus Access Protocol .........................................................................................................................................4
1-4-2 Data throughput...............................................................................................................................................5
1-4-3 Diagnostics functions .......................................................................................................................................6
1-4-4 Protection mechanisms.....................................................................................................................................6
1-4-5 Network states ..................................................................................................................................................7
1-5 Device Data Base files ...............................................................................................................................................8
1-6 Profiles.......................................................................................................................................................................8
1
Introduction
!
Caution
1-1 Introduction
Multi-vendor
Standard
EN 50170
High speed
Process Automation
Section 1-1
PROFIBUS is a vendor-independent, open fieldbus standard for a wide range
of applications in manufacturing, process and building automation. Vendor
independence and openness are guaranteed by the PROFIBUS standard
EN 50170. With PROFIBUS, devices of different manufacturers can
communicate without special interface adjustments.
The PROFIBUS family consists of three compatible versions:
PROFIBUS-DP
DP stands for Decentralised Periphery. It is optimised for high speed and low-
cost interfacing, especially designed for communication between automation
control systems and distributed I/O at the device level.
PROFIBUS-PA
PA stands for Process Automation. It permits sensors and actuators to be
connected on one common bus line even in intrinsically-safe areas. It permits
data communication and power supply over the bus using 2-wire technology
according the international standard IEC 1158-2.
Higher level
Uniform bus access protocol
PROFIBUS-FMS
FMS stands for Fieldbus Message Specification. This version is the general-
purpose solution for communication tasks at a higher level. Powerful services
open up a wide range of applications and provide great flexibility. It can also
be used for extensive and complex communications tasks.
PROFIBUS-DP and PROFIBUS-FMS use the same transmission technology
and a uniform bus access protocol. Thus, both versions can be operated
simultaneously on the same cable. However, FMS field devices cannot be
controlled by DP masters or vice versa.
It is not possible to exchange one of these family members by another family
member. This will cause faulty operation.
The rest of this section only describes PROFIBUS-DP.
1-2 Protocol architecture
OSI
The PROFIBUS protocol architecture is oriented on the OSI (Open System
Interconnection) reference model in accordance with the international
standard ISO 7498. Layer 1 (physical layer) of this model defines the physical
transmission characteristics. Layer 2 (data link layer) defines the bus access
protocol. Layer 7 (application layer) defines the application functions.
2
Protocol architecture
Section 1-2
DP-Profiles
DP-Extensions
User Interface Layer DP Basic Functions
(7) Application Layer
(6) Presentation Layer
(5) Session Layer NOT DEFINED
(4) Transport Layer
(3) Network Layer
(2) Data Link Layer Fieldbus Data Link (FDL)
(1) Physical Layer RS-485 / Fibre Optics
Layer 1, 2 and user interface
Transmission medium
High-speed, inexpensive
Easy installation
Cable length
PROFIBUS-DP uses layers 1 and 2, and the user interface. Layers 3 to 7 are
not defined. This streamlined architecture ensures fast and efficient data
transmission. The application functions which are available to the user, as
well as the system and device behaviour of the various PROFIBUS-DP device
types, are specified in the user interface. RS-485 transmission technology or
fibre optics are available for transmission. RS-485 transmission is the most
frequently used transmission technology. Its application area includes all
areas in which high transmission speed and simple inexpensive installation
are required. Twisted pair shielded copper cable with one conductor pair is
used.
The RS-485 transmission technology is very easy to handle. Installation of the
twisted pair cable does not require expert knowledge. The bus structure
permits addition and removal of stations or step-by-step commissioning of the
system without influencing the other stations. Later expansions have no effect
on stations which are already in operation.
Transmission speeds between 9.6 kbit/s and 12 Mbit/s can be selected. One
unique transmission speed is selected for all devices on the bus when the
system is commissioned.
The maximum cable length depends on the transmission speed (see table
below). The specified cable lengths are based on type-A cable (see
section 2-3-1). The length can be increased by the use of repeaters. The use
of more than 3 repeaters in series is not recommended.
Baud rate (kbit/s) Distance/segment (m)
9.6 1200
19.2 1200
93.75 1200
187.5 1000
500 400
1500 200
3000 100
6000 100
12000 100
3
Device types
1-3 Device types
Master devices
Active stations
DPM1, DPM2
Slave devices
Passive stations
Section 1-3
PROFIBUS distinguishes between master devices and slave devices.
Master devices determine the data communication on the bus. A master can
send messages without an external request when it holds the bus access
rights (the token). Masters are also called active stations in the PROFIBUS
protocol.
There are two types of master devices: DP master class 1 (DPM1) and DP
master class 2 (DPM2). A DPM1 is a central controller which exchanges
information with the decentralised stations (i.e. DP slaves) within a specified
message cycle. DPM2 devices are programmers, configuration devices or
operator panels. They are used during commissioning for configuration of the
DP system or for operation and monitoring purposes.
Slave devices are peripheral devices. Typical slave devices include
input/output devices, valves, drives and measuring transmitters. They do not
have bus access rights and they can only acknowledge received messages or
send messages to the master when requested to do so. Slaves are also
called passive stations.
The C200HW-PRM21 is a DPM1 device.
1-4 PROFIBUS-DP characteristics
1-4-1 Bus Access Protocol
Layer 2
Medium Access Control
Token passing
Polling procedure
The bus access protocol is implemented by layer 2. This protocol also
includes data security and the handling of the transmission protocols and
telegrams.
The Medium Access Control (MAC) specifies the procedure when a station is
permitted to transmit data. The token passing procedure is used to handle the
bus access between master devices and the polling procedure is used to
handle the communication between a master device and its assigned slave
device(s).
The token passing procedure guarantees that the bus access right (the token)
is assigned to each master within a precisely defined time frame. The token
message, a special telegram for passing access rights from one master to the
next master must be passed around the logical token ring - once to each
master - within a specified target rotation time.
The polling or master-slave procedure permits the master, which currently
owns the token, to access the assigned slaves. The picture below shows a
possible configuration.
4
PROFIBUS-DP characteristics
The configuration shows three active stations (masters) and six passive
stations (slaves). The three masters form a logical token ring. When an active
station receives the token telegram, it can perform its master role for a certain
period of time. During this time it can communicate with all assigned slave
stations in a master-slave communication relationship and a DPM2 master
can communicate with DPM1 master stations in a master-master
communication relationship.
Multi-peer communication
In addition to logical peer-to-peer data transmission, PROFIBUS-DP provides
multi-peer communication (broadcast and multicast).
Broadcast communication: an active station sends an unacknowledged
Multicast communication: an active station sends an unacknowledged
Section 1-4
message to all other stations (master and
slaves).
message to a predetermined group of stations
(master and slaves).
1-4-2 Data throughput
Transmission time
At 12 Mbit/s PROFIBUS-DP requires only about 1 ms for the transmission of
512 bits of input data and 512 bits of output data distributed over 32 stations.
The figure below shows the typical PROFIBUS-DP transmission time
depending on number of stations and transmission speed. The data
throughput will decrease when more than one master is used.
5
PROFIBUS-DP characteristics
Bus cycle time vs number of slaves
Section 1-4
25.0
Bus cycle time [ms]
Conditions: Each slave has 2 bytes of input data and 2 bytes of output data.
1-4-3 Diagnostics functions
Extensive diagnostics
Device related diagnostics
Module related diagnostics
Channel related diagnostics
The extensive diagnostic functions of PROFIBUS-DP enable fast location of
faults. The diagnostic messages are transmitted over the bus and collected at
the master. These messages are divided into three levels:
• Device related diagnostics
These messages concern the general operational status of the whole
device (i.e. overtemperature or low voltage).
• Module related diagnostics
These messages indicate that a fault is present in a specific I/O range
(e.g. an 8-bit output module) of a station.
• Channel related diagnostics
These messages indicate an error at an individual input or output (e.g.
short circuit on output 5).
20.0
15.0
10.0
5.0
0.0
0 4 8 12 16 20 24 28 32
500
1500
3000
12000
Slaves
1-4-4 Protection mechanisms
Time monitoring
At the master
At the slave
6
PROFIBUS-DP provides effective protection functions against parameterisation errors or failure of the transmission equipment. Time monitoring is
provided at the DP master and at the DP slaves. The monitoring interval is
specified during the configuration.
• Protection mechanism at the master.
The DPM1 monitors data transmission of the slaves with the
Data_Control_Timer. A separate control timer is used for each slave. This
timer expires when correct data transmission does not occur within the
monitoring interval. The user is informed when this happens. If the
automatic error reaction (Auto_clear = TRUE) has been enabled, the
DPM1 exits its Operate state, switches the outputs of all assigned slaves
to fail-safe status and changes to its Clear status (see also next section).
• Protection mechanism at the slave.
The slave uses the watchdog control to detect failures of the master or the
transmission line. If no data communication with the master occurs within
the watchdog control interval, the slave automatically switches its outputs
to the fail-safe status.
Also, access protection is required for the inputs and outputs of the DP
slaves operating in multi-master systems. This ensures that direct access
PROFIBUS-DP characteristics
1-4-5 Network states
PROFIBUS-DP distinguishes four different states.
Offline
Stop
Clear
Operate
Auto_clear
Fail-safe state
• Offline
• Stop
• Clear
• Operate
When an error occurs during the data transfer phase of the DPM1, the
‘Auto_clear’ configuration parameter determines the subsequent actions. If
this parameter is set to false, the DPM1 remains in the Operate state. If set to
true, the DPM1 switches the outputs of all assigned DP slaves to the fail-safe
state and the network state changes to the Clear state.
Section 1-4
can only be performed by the authorised master. For all other masters, the
slaves offer an image of their inputs and outputs which can be read from
any master, even without access rights.
Communication with all DP participants is stopped.
Communication between DPM1 and DP slaves is stopped. Only communication between DPM1 and DPM2 is possible.
DPM1 master tries to set parameters, check the configuration, and
perform data exchange with its associated DP-slaves. The data exchange
comprises reading the inputs of the DP-slaves and writing zero’s to the
outputs of the DP-slaves.
DPM1 master exchanges data with its assigned slaves, inputs are read
and outputs are written. Beside this, the DPM1 cyclically sends its local
status to all assigned DP slaves (with a multicast) at a configurable time
interval.
7
Device Data Base files
1-5 Device Data Base files
Section 1-5
Plug-and-play
DDB-file, GSD-file
General section
DP-master section
DP-slave section
Configurator
To achieve simple plug-and-play configuration of the PROFIBUS-DP network,
the characteristic features of a device are specified in a file. This file is called
a DDB-file (Device Data Base file) or a GSD-file (Gerätestammdaten file). The
GSD files are prepared individually by the vendor for each type of device
according a fixed format. Some parameters are mandatory, some have a
default value and some are optional.
The device data base file is divided into three parts:
• General specifications
This section contains vendor and device names, hardware and software
release states, station type and identification number, protocol specification and which baud rates are supported.
• DP master-related specifications
This section contains all parameters which only apply to DP master
devices (i.e. maximum memory size for master parameter set, maximum
number of entries in the list of active stations or the maximum number of
slaves the master can handle).
• DP slave-related specifications
This section contains all specification related to slaves (i.e. minimum time
between two slave poll cycles, specification of the inputs and outputs and
about consistency of the I/O data).
The device data base file of each device is loaded in the configurator and
downloaded to the master device. The device data base file for the C200HWPRM21, named OC_1656.GSD, is provided with the configuration software.
Section 4 will describe the configurator package SyCon, which is used for
configuration of the C200HW-PRM21, in more detail.
1-6 Profiles
Exchanging devices
To enable the exchange of devices from different vendors, the user data has
to have the same format. The PROFIBUS-DP protocol does not define user
data, it is only responsible for the transmission of this data. The format of user
data is defined in so called profiles. Profiles may reduce engineering costs
since the meaning of application-related parameters is specified precisely.
Profiles have for instance been defined for drive technology, encoders, and
for sensors / actuators.
8
2 Installation
This section describes the installation of the C200HW-PRM21
2-1 Physical layout of the unit........................................................................................................................................10
2-1-1 LEDs...............................................................................................................................................................10
2-1-2 Rotary Switch .................................................................................................................................................10
2-1-3 BUS Connector...............................................................................................................................................11
2-1-4 Configurator Connector.................................................................................................................................12
2-1-5 Termination Switch.........................................................................................................................................13
2-2 Mounting the C200HW-PRM21 ..............................................................................................................................13
2-3 Setting up a network.................................................................................................................................................14
2-3-1 Fieldbus cabling.............................................................................................................................................14
2-3-2 Configuring the fieldbus.................................................................................................................................16
9
Physical layout of the unit
2-1 Physical layout of the unit
The figure below shows the side and front views of the C200HW-PRM21.
Section 2-1
2-1-1 LEDs
2-1-2 Rotary Switch
The front view shows the indicator LEDs, the ‘Machine No.’ rotary switch, two
9-pin female sub-D connectors, and the bus termination switch.
The C200HW-PRM21 has 6 indicator LEDs. The two LEDs on the left side
give a status indication of the unit in general. The four LEDs on the right side
are related to the status of the PROFIBUS-DP network Refer to section 5-4
for a detailed (functional) description of the LEDs.
The rotary switch is used to set the unit number (or so called “Machine No.”).
The unit number setting determines which words in the Internal Relay and
Data Memory Areas are allocated to the Master Unit.
The allowed unit number setting range depends on the PLC CPU Unit being
used, as shown in the following table.
10
Physical layout of the unit
Section 2-1
Note
2-1-3 BUS Connector
CPU Unit models Unit number
C200HS, C200HE,
C200HG-CPU3[ ]-E/CPU4[ ]-E,
C200HX-CPU3[ ]-E/CPU4[ ]-E
C200HG-CPU5[ ]-E/CPU6[ ]-E,
C200HX-CPU5[ ] -E/CPU6[ ]-E
Cs1-series
setting range
0 to 9 Single-digit
0 to F
Setting
method
hexadecimal
Any unit number in the setting range is allowed as long as it has not been set
on another Special I/O Unit connected to the PLC. If the same unit number is
used for the C200HW-PRM21 and another Special I/O Unit, an I/O Unit Over
error will occur in the PLC and it will not be possible to start up the
PROFIBUS-DP Network.
Always turn OFF the power to the PLC before changing the unit number
setting. The Unit only reads the unit number setting during the initialisation
after power-up, so not after a software reset.
Use a small flat-blade screwdriver to turn the rotary switch; be careful not to
damage the switch.
The fieldbus connector is a 9-pin female sub-D connector, as recommended
by the PROFIBUS standard EN 50170.
Pin No. Signal Description
1 Shield Shield / protective ground
2 - 3 B-line Data signal
4 RTS Control signal for repeaters (direction control) (TTL)
5 DGND Data ground
6 VP Supply voltage of the terminator resistance (5V)
7 - 8 A-line Data signal
9 - -
The signals DGND and VP are used internally to power the bus terminator
(see section 2-1-5).
The signal RTS (TTL signal) is meant for the direction control of repeaters if
repeaters without self control capability are used.
The PROFIBUS standard defines 24 V remote powering signals for pin 2 and
pin 7. These signals are optional and have not been implemented in this Unit.
11
Physical layout of the unit
2-1-4 Configurator Connector
The configurator connector is a 9-pin female sub-D connector.
Pin No. Signal Description
1 FG Frame Ground (shield)
2 SD Send Data
3 RD Receive Data
4 RS Request to Send
5 CS Clear to Send
6 - 7 - 8 - 9 SG Signal Ground
The pin assignment of this connector is the same as the that of the RS-232C
port provided on most C200H-series CPUs. This enables the use of the same
serial communication cable for both the CPU and the C200HW-PRM21.
Section 2-1
The wiring of the RS-232C cable is shown in the picture below.
PRM21
Personal computer
Configurator port
Signal Pin No. Pin No. Signal
FG 1
shielded cable
1 SD 2 2 RD
RD 3 3 SD
RS 4 4 DTR
CS 5 5 SG
- 6 6 DSR
- 7 7 RS
- 8 8 CS
SG 9 9 -
Case Case
12
Mounting the C200HW-PRM21
2-1-5 Termination Switch
The termination switch has two positions. When the switch is set to the right
(as shown below), the termination is disabled. By setting the switch to the left,
the termination is enabled.
Enabling the termination connects the two data lines using a 220 Ω resistor
which is connected to VP and DGND via two 390 Ω resistors (see figure
below). The powering of the terminator resistor ensures a defined idle state
potential on the data lines.
To ensure proper functioning up to the highest baud rate, the bus cable has to
be terminated on both ends of the cable.
VP
Section 2-2
390 Ω
B-line
220 Ω
A-line
390 Ω
DGND
2-2 Mounting the C200HW-PRM21
The PROFIBUS-DP Master Unit (C200HW-PRM21) can be mounted to the
CPU Rack or Expansion I/O Rack of any CS1, C200HX, -HG, -HE, or -HS
PLC. Refer to the PLC’s Installation Guide for details on mounting Units.
Limitations
There are some limitations on mounting the Master Unit.
• The Master Unit is a Special I/O Unit. It can be mounted in any slot in the
Backplane of a CPU Rack or Expansion I/O Rack as long as its unit
number is not the same as the unit number of another Special I/O Unit
within the system.
• The current consumption all of units mounted on one backplane should not
exceed the maximum output of the power supply. The C200HW-PRM21
consumes up to 600 mA from the 5V supply. Verify the characteristics of
all other units on their respective Instruction Sheets.
• The maximum number of Master Units that can be mounted depends on
the PLC CPU type.
13
Setting up a network
C200HS-CPU[ ] (all models)
C200HE-CPU11/32/42
C200HG-CPU33/43
C200HX-CPU34/44
C200HG-CPU53/63
C200HX-CPU54/64
CS1-series
2-3 Setting up a network
2-3-1 Fieldbus cabling
Section 2-3
CPU Unit models Max. No. of Master Units
10
16
Bus structure
Cable type
Maximum length
All devices are connected in a bus structure (i.e. line). Up to 32 stations
(master or slaves) can be connected in one segment. The bus must be
terminated at the beginning and at the end of each segment. When more than
32 stations are used, repeaters must be used to link the individual bus
segments. The maximum number of stations that can be connected to a
C200HW-PRM21 is 124.
The standard EN 50170 specifies to use line type A of shielded twisted pair
cables with the following parameters:
Parameter Value
Impedance 135 to 165 Ω
Capacitance per unit length < 30 pF/m
Loop resistance 110 Ω/km
Core diameter 0.64 mm
Core cross section > 0.34 mm
2
The maximum length of the cable depends on the transmission speed. The
cable lengths specified in the table below are based on line type A.
Baud rate (kbit/s) Distance/segment (m)
9.6, 19.2, 93.75 1200
187.5 1000
500 400
1500 200
3000, 6000, 12000 100
Repeaters
Stub lines
14
The communication distance can be increased by the use of repeaters. It is
not recommended to use more than 3 repeaters in series. A repeater also
must be included in the count of the number of stations per segment to
determine the bus load (so only 31 ‘normal’ devices are possible per segment
if a repeater is used)
Stub lines should be avoided for data transmission speeds of more than
500 kbit/s. Plug connectors available on the market permit the incoming data
cable and the outgoing data cable to be connected directly in the plug
connector. This means that stub lines do not have to be used, and the bus
plug connector can be connected and disconnected at all times without
interrupting data communication with the other stations.
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