Transcript Welcome to the I/A Series - Call H.A.S. for your DeltaV

Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Goals for this Presentation
Provide information on the steps required for successful device
integration implementation.
Provide information for making decisions for selecting the proper
hardware and software for the implementation.
Provide information on the types of tools that are useful for a successful
implementation.
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
What you should know before you start
Steps to successfully implement a device interface
Information on the Device to be integrated.
I/A Series products: How to choose the appropriate Hardware/Software
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Integration Engineering
Definition
3
Design
Implemen
t
Integrate
Start-up
Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Integration Definition – Foreign Device Definition
Manufacturer
Model
Communications Protocol Supported
Types of ports available
Decide on Communication parameters
Decide on Network Address
Types of Queries supported
Memory Map of desired data points
Does the device have a user mappable memory range?
Does the device have redundant communications capability?
How many devices will be on this serial bus?
How far away from the integrator will the device be?
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Integration Definition – Foreign Device Definition
Manufacturer
Model
This is not necessarily essential information, but you may want to use some
aspect of the manufacturer/Model information to name your ECB,
Compound, or Control Blocks.
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Integration Information – Foreign Device Definition
Communications Protocol Supported
I/A Series Integration Information
An MG30 supports Modbus Master RTU Protocol
An FBM224 Supports Modbus Master RTU Protocol
An AB30 Supports Allen-Bradley DF1 protocol
All other protocols require the use of the DI30 with a protocol specific
software component
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Integration Definition – Foreign Device Definition
Types of ports available
What type of physical connector does the device have?
DB9, DB25, RJ45, Terminal Strip, Male or Female
Which serial protocols are supported?
RS232, RS485, RS422
Note: RS485 is the only multi-drop protocol.
I/A Series Integration Information
All 30 Series integrators support RS232 with a Male 25-pin Dconnector.
The FBM224 supports RS232 with a male 25-pin D-connector AND
RS485/RS422 with terminal connections.
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Integration Definition – Foreign Device Definition
Decide on Communication parameters
Baud Rate
Databits
Parity
Stop Bits
(Typically 9600 default)
(7 or 8)
(Even, Odd, None)
(1 or 2)
I/A Series Integrator Information
Integrators support up to 19200 Baud (configurable)
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Integration Definition – Foreign Device Integration
Decide on Network Address
This network address is specific to the protocol
Modbus Specific Information
The valid network address range for Modbus is between 1 and 256.
0 is a broadcast address.
The Master does not have a specified address (only one master per bus).
If more than one device exists on the serial bus, each must have a unique
network address.
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Integration Definition – Foreign Device Definition
Types of Queries supported
Modbus Specific Information
Typically function codes 1,2,3,4,5,6,15,and 16 are supported by modbus
devices
Heartbeat is one query type for Modbus (function code 8) that can cause
intermittent failures if the field device does not support this function.
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Integration Definition – Foreign Device Definition
Memory Map of desired data points
Modbus Specific Information
The Memory Address and whether the query is a read or a write determines
function code used to obtain that information.
Memory Map
0-9999
10000-19999
40000-49999
30000-39999
Read
function code 1
function code 2
function code 3
function code 4
Write
function code 5,15
N/A
function code 6, 16
N/A
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Integration Definition – Foreign Device Definition
Does the device have a user mappable memory range?
Important for the efficiency of the interface in cases where the data points
are not arranged in a contiguous fashion.
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Integration Definition – Foreign Device Definition
Does the device have redundant communications capability?
This question is important to determine which software package is correct
for your application.
I/A Series Integrator Information
The DI30 has two ports. Each can talk to a separate device or as a
redundant port.
The MG30 has two ports. The second can be configured as a “B” bus to the
same device.
The FBM224 has four ports and a redundant port can be configured.
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Integration Definition – Foreign Device Definition
How many devices will be on this serial bus?
This question is important to decide upon the bus architecture.
If only one device is on the bus, RS232, RS422, and RS485 are all valid
choices.
For multiple devices on the same bus, only RS485 supports multidrop.
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Integration Definition – Foreign Device Definition
How far away from the integrator will the device be?
This question is important to ask to determine which protocol/and or
converters will be required.
For instance, if the distance is greater than 50 feet, then RS232 is not a
good option without the use of converters.
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Design considerations
In today's terms, serial communications have a very low throughput.
Example: Assume that a typical query takes 200 ms to reach the field
device, the field device takes 100 ms to process the query and build the
response message, then 200 seconds for the response to reach the
integrator.
That equal 500 ms turnaround per query. In essence 2 queries per second.
This is why it is extremely important to gauge the total number of queries
on a serial bus and use a conservative estimate for turnaround time.
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Design considerations
How many queries will I have?
Each Modbus device on a bus will take a minimum of one query
Each different function code (including heartbeat) requires its own query.
If memory locations are not contiguous, and a “reserved” or “restricted”
memory address is between the desired data points, then more than one
query will be required per query range.
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Design considerations
How many queries will I have?
Example1: I have a device from which I wish to obtain 10 discrete data
points, 10 analog values, write 10 analog values, and write 10 discrete data
points. This device supports heartbeat.
This interface would have five (5) queries and the update time should be
set to no faster than 2.5 seconds.*
*actual turnaround times can be checked with a communications probe.
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Design considerations
How many queries will I have?
Example2: I have 2 devices on the same RS485 bus from which I wish to
obtain 10 discrete data points, 10 analog values, write 10 analog values,
and write 10 discrete data points each. These devices support heartbeat.
This interface would have five (10) queries and the update time should be
set to no faster than 5 seconds.*
*actual turnaround times can be checked with a communications probe.
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Integration Design
Should you use a MG30, DI30, or a FBM224 for your implementation?
An MG30 is for Modbus RTU Master protocol only, but is very easy to
configure.
A DI30 Can be Master or Slave, RTU or ASCII, and has settable parameters for
communication timing adjustments, but is much more complex to configure.
An FBM224 is easy to configure, but is also for Modbus RTU Master protocol
only and is only currently available for 6.5 and 7.1 versions.
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Integration Design
In Summary,
Use an FBM224 if you are at V6.5 or 7.1 and the device is a Modbus Slave.
Use a MG30 if at any other version and the device is a Modbus RTU Slave.
Use a DI30 if neither of the above apply.
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MG30/AB30/DI30 form factor
2
FBM224 form factor
2
Device Integrator 30 Configurations
Non Redundant Device Integrator
Redundant Device Integrator
2
MG30 INTEGRATION
Non Redundant Configuration
Redundant Configuration
2
DI 30 Integration Inputs
Message
ECB
FDIDMS
FDRIN
FDIIN
Other
Blocks
FDBIN
2
DI 30 Integration Outputs
Message
ECB
FDMSBL
FDROUT
FDIOUT
Other
Blocks
FDBOUT
2
DI 30 Integration Master vs Slave
Message
ECB
FDSCAN
Master Configuration
Data
Data Scanned at regular frequency
Message
Set by FDSCAN Block Period
Data
Message
ECB
FDIDMS
Slave Configuration
Data Identified and used
as it is sent from the
Field Device
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MODBUS INTEGRATOR BLOCKS
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2
AIN
ALMPRI
AOUT
CALC
CHARC
CIN
COUT
DEP
EXC
GDEV
IND
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MAIN
MCIN
MCOUT
MON
MOVLV
MTR
PATALM
REALM
TIMR
VLV
ModBus 30 Integration
ECB
AIN
MDSCAN
BLOCK
CIN
AOUT
COUT
3
O
T
H
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R
B
L
O
C
K
S
Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Integration Design
Create a drawing showing the architecture of the interface consisting of the
following elements:
Integrator
Cable and FTA for the Integrator
Any converters required for the interface.
Identify the type of media for each cable (fiber-optic, Twin-axial, etc…)
The dip-switch settings for the FTA based on the Definition information and the
settings shown in each of the Integrator specific user documentation.
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Useful Tools for Modbus Implementation
Break-Out Box - This device connects in line with an RS232 bus to
show signal voltage for all of the data and control lines for this
protocol.
Communication (data) probe – This device also connects in line
with the RS232 bus to show actual bytes of data as well as
showing signal voltage for all the data and control lines.
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Useful Tools for Modbus Implementation
Modbus/Modsim simulation program - This application allows you
to use a laptop (or tabletop) PC to emulate a Modbus Master or
Modbus Slave device respectively, and view the modbus data
bytes.
Null Modem Connectors – This device connects in line with the
RS232 bus to correct one of the most common RS232 problems. It
converts the control and data lines from a DTE to a DCE type.
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Useful Tools for Modbus Implementation
Assorted cables and connectors - Make sure that an assortment
of cable types (9-pin versus 25-pin) and male-to-male and femaleto-female adapters are available. Nothing stops implementation
faster than not being able to physically attach a cable. If the
implementation will use a RS485 bus, it is a good idea to have an
extra RS232/RS485 converter available to use the RS232 only
tools!
Modbus Device Vendor – Many times an implementation comes to
a screeching halt because no one is available that can look inside
the foreign device to verify basic communications settings. So if
no one is available that knows the device well, then it is best to
have a vendor representative present during implementation
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Steps to implement the interface
1.
Verify Foreign device is ready for communication by using Modsim or
similar modbus master emulator to query a specific modbus data point.
Once you can connect with this program, you can consider the foreign
device ready for connection with the integrator.
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Steps to implement the interface
2.
Connect the interface based on the Design information.
Be sure all dip-switch settings on the Integrator FTA are correct.
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Steps to implement the interface
3.
Build the ECBs and one integrator specific block based on the individual
integrator User Documentation.
Remember to put the appropriate ECBs on-line in System Management
and to turn on the Compound for the selected data point. Note that DI30s
can require multiple compounds for one data point.
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Steps to implement the interface
4.
If the data point responds as desired, build any remaining ECBs and
integrator specific block based on the individual integrator User
Documentation.
Remember to put the appropriate ECBs on-line in System Management
and to turn on the Compound for the selected data point. Note that DI30s
can require multiple compounds for one data point.
If the point does not respond as desired, troubleshoot using the tools shown
in the previous section.
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Steps to implement the interface
5.
Connect the Integrator specific data block to the standard I/A Series blocks
(such as AIN, CIN) for scaling and display.
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Example ECB Configuration
The type and quantity of ECBs to be configured depends upon which
hardware/software is used (i.e. DI30, MG30, FBM224)
This example will use the MG30 configuration.
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Device Integration
A Practical Guide to Device Integration with an emphasis on the
Modbus Serial Protocol
Example ECB Configuration
The MG30 gateway requires the configuration of two ECBs
1. ECBPG – represents gateway and sets communication parameters
2. ECB16 – represents the Modbus Device and contains specific
information for that device.
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Device Integration
Example ECBPG Configuration
This parameter defines the number of active ports:
1 = 1 Port
2 = 2 Ports
This parameter defines the Bus switching options
1 = Bus A only 2 = Bus B only
3 = Bus A with bus B switching enabled
4 = Bus B with bus A switching enabled
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Device Integration
Example ECB16 Configuration
Typically, 2 will work for any device.
Specific device parameters are:
1 = AEG 484
3 = AEG 884
2 = AEG 584
4 = AEG 984
This parameter defines the unique network address
of the Modbus Device.
Don’t confuse it with the memory addresses.
The valid range is 1 - 247
0 = No Heartbeat
1 = Heartbeat
Do not enable heartbeat unless you are sure your
Modbus device supports heartbeat.
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ALLEN BRADLEY INTEGRATION
AB 30
KF OR KE
Module
PLC
4
PLC
PLC
PLC
AB 30 Integration
ECB
AIN
ABSCAN
BLOCK
CIN
AOUT
COUT
4
O
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H
E
R
B
L
O
C
K
S
AB INTEGRATOR BLOCKS
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4
AIN
ALMPRI
AOUT
CALC
CHARC
CIN
COUT
DEP
EXC
GDEV
IND
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MAIN
MCIN
MCOUT
MON
MOVLV
MTR
PATALM
REALM
TIMR
VLV
Other Integration Products
 Application Workstation provides
integration to third party devices
 Multiple Media
 RS232 or RS485
 Ethernet
Nodebus
AW50/70
Integrator
(w/ Foxblocks)
 Multiple Protocols
 Modbus
 AB Data Highway
 I/O Gate - DDE
 Scaleable ValueBlocks
E-net
I/A Series Fieldbus
RS-232 or
RS485
Fieldbus
Module
AB PLC or
GE PLC or
SCADA System
DDE I/O Gate
762 Controllers
SCADA System
Modbus
AB Data highway +
DDE I/O Gate
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