Modbus-IoT (Modbus over MQTT)

Modbus?? old school protocol (more than 40th years).

when Modbus created, it was created for Serial communication via RS485. after year by year, technology was changing and ethernet / TCP widely used in PLC and industrial control system, then Modbus move their medium to Ethernet and wrap their message in TCP (encapsulated) over ethernet.

Now, when everything going to the cloud or  RTU/PLC are not in the same place with SCADA and it only have internet connection, it will be hard and expensive for Modbus to keep exist in Internet area. because we need at least public IP for each device, or creating VPN.

but with MQTT the message can be send over the broker (on the cloud), so it will be exiting if modbus can be sent through MQTT.

if you’ve heard about Node-red this is cool IoT tools/platform built in NodeJS.

I’m using Node-red to make it’s encapsulation, and Modscan as Modbus Master (or SCADA), and Modsim as Modbus Slave (or  PLC)

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Vijeo XL ( Machine SCADA )- Indusoft Web Studio – Intouch Machine Edition

Pada tahun 2013, Indusoft sebuah software company yang bermarkas di Texas USA, di akuisisi / dibeli oleh Vendor dan Multinational Company yang membindagi automation software dan DCS ternama yaitu Invensys dimana perusahaan ini memiliki sebuah rentang produk yang cukup lengkap dari Mulai DCS nya Foxboro DCS, Triconex Safety System, dan si Worldwide Market Leader untuk SCADA dan HMI yaitu Wonderware. Walaupun bertahun-tahun sebelumnya Invensys sudah mengakuisisi Wonderware, sepertinya masih belum puas dengan fitur-fitur dan segment yang ditawarkan oleh Wonderware baik Wonderware System Platform dan keturunannya seperti Intouch HMI. Mungkin Invensys mengejar ranah low-end market dimana indusoft pada saat itu bermain di OEM software dan HMI kelas murah.

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OPC Common Error Code

Berikut adalah kumpulan error yang sering terjadi ketika anda mencoba mengkoneksikan OPC client ke OPC Server, Error-error ini biasanya muncul pada sisi client dan beberapa error yang sudah diketahui tersedia solusi untuk penyelesaiannya yang bisa jadi ada pada sisi server maupun client.

 

HEX Description Solution
 0x80010108  The object invoked has disconnected from its clients.  Re-initialize your OPC Server Connection.
 0x80040004  There is no connection for this connection ID
 0x80040005  Need to run the object to perform this operation
 0x80040007  Uninitialized object
 0x80040154  Class not registered The OPC Server, or a component needed to make the OPC connection is not registered with Windows. This may mean that you simply need to register a DLL or OCX file.
 0x80040155  Interface not registered  The OPC Server does not support the interface that you are trying to connect to. Examples may include Item Browsing, Asynchronous I/O or OPC DA v2.x or 3.x interfaces etc.
 0x800401f3  Invalid class string  The GUID/CLSID of the specified OPC Server is not valid.
 0x80040200 -Unable to impersonate DCOM
Client
-Unknown OLE status code
 DCOM security problem, typically on the Client side. This error typically occurs when trying to specify a callback address for Asynchronous I/O.
 0x80040202  Cannot Connect  Error typically occurs when a call is made to Advise on the connection point. This often
means that OPCPROXY.DLL is not the same version on your different computers.
 0x80070002 The system cannot find the file specified  Re-install your software.
 0x80070005  Access is denied. You need to configure your DCOM Security settings. See our DCOM Tutorial:
http://www.softwaretoolbox.com/dcom
 0x80070057  The parameter is incorrect.  The OPC Server has rejected your request,
indicating that the parameter(s) you specified
are not valid for the type of request being
made. You will need more details on the
actual OPC calls being made between the
Client and Server.
 0x8007041d  The service did not respond
to the start or control request
in a timely fashion.
 Specific to Windows Services. The service did
not start within the allowed time-frame. This
indicates an initialization problem with the
Windows service
 0x800705b4  This operation returned
because the timeout period
expired.
 This is a timeout. You may need to increase
your timeout settings.
 0x800706ea  A floating-point underflow
occurred at the RPC server.
 0x80070725  Incompatible version of the
RPC stub.
 0x80080005  Server execution failed  There is a problem with the OPC Server
preventing it from being started by Windows.
This may be the result of file-permissions,
DCOM Security permissions, or a lack of
resources.
 0x80004002  No such interface supported  The OPC Server does not support the
interface that you are trying to connect to.
Examples may include Item Browsing,
Asynchronous I/O or OPC DA v2.x or 3.x
interfaces etc.
 0x80004005   Unspecified error  The most common message seen, that yields
the least information. In these cases you often
need to check the event-logs at your OPC
Server for more information.
 0x8000401a   The server process could not
be started because the
configured identity is
incorrect. Check the
username and password.
DCOM Configuration permissions. Modify the
identity that the application should run under,
perhaps specify a named account or choose
“Interactive User’.
 0x800706ba  The RPC server is
unavailable.
 The OPC Server could not be contacted. This
is usually the result of a firewall blocking the
application.

 

Source: Indusoft Documentation

 

Jika anda pernah mendapatkan jenis error lain silahkan dishare di posting ini. Terimakasih

Water Tank PLC Control Simulation with Matlab Simulink

httpvh://youtu.be/Uz827S7tjRU

To play this simulation you need to have this item:

  1. Unity PRO S (minimum) / Unity Pro L /Unity Pro XL. Version 5 / 6 / 7 / 8 (I’m not provide the installer, you can find on another forum 1.5 Gb)
  2. Matlab 2012 / Matlab 2013 with simulink (I’m not provide the installer, you can find on another forum 6.5Gb)
  3. Modbus Ehternet OPC Server (Iconics) http://adf.ly/lA1Gt this is free OPC server, you don’t need to license the software
  4. Simulink Model, OPC Configuration(should be load from iconics modbus OPC Server) http://adf.ly/lA205

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Trik mencari modbus register

Anda pernah mengalami kesulitan ketika mencari register address dari device modbus yang datasheetnya sudah hilang atau susah ditemukan di internet, atau merek yang jarang dipakai banyak orang? maka jika anda memilki software untuk membaca data pengukuran dari device tersebut maka anda masih ada kesempatan untuk mengetahui registernya. READ MORE

Modbus Exception Codes

Modbus Exception Codes adalah  sebuah reply dari slave ketika kita mengQuery ke slave.

susunan Frame nya sebagai berikut:

[Slave Address] [Function Code Exception] [Error Code] [CRC1] [CRC2]

 

Function Code Exception:

merupakan “exception code” dari “function code” yang kita query kan ke Slave
contoh:

ketika kita merequest Funtion code 03 (Read Holding Register) maka exception code-nya adalah 83

ketika kita merequest Funtion code 06 (Write Multiple Register) maka exception code-nya adalah 86

Berikut adalah tabelnya:

Function Code in Request

Function Code in Exception Response

01 (01 hex) 0000 0001

129 (81 hex) 1000 0001

02 (02 hex) 0000 0010

130 (82 hex) 1000 0010

03 (03 hex) 0000 0011 131 (83 hex) 1000 0011

04 (04 hex) 0000 0100

132 (84 hex) 1000 0100
05 (05 hex) 0000 0101 133 (85 hex) 1000 0101
06 (06 hex) 0000 0110 134 (86 hex) 1000 0110
15 (0F hex) 0000 1111 143 (8F hex) 1000 1111
16 (10 hex) 0001 0000 144 (90 hex) 1001 0000

Error Code:

merupakan pesan error yang ingin disampaikan oleh slave terdiri seperti pada tabel dibawah:

Code Name Description
01 ILLEGAL FUNCTION The function code received in the query is not an allowable action for the slave
02 ILLEGAL DATA ADDRESS The data address received in the query is not an allowable address fror the slave
03 ILLEGAL DATA VALUE A value contained in the query data field in not an allowabel value for the slave.
04 SLAVE DEVICE FAILURE An unrecoverable error occurred while the savel was attempting to execute the requested action
05 ACKNOWLEDGE The slave has accpeted the request and is processing it, but a long duration of time is required to do so.
06 SLAVE DEVICE BUSY The slave is engaged in a long duration command.
07 NEGATIVE ACKNOWLEDGEMENT The slave cannot perform the program function received I the query
08 MEMORY PARITY ERROR The slave attempted to read extended memory, but detected a a parity error on the memory

Atau yang lebih lengkap:

Exception Code

Name

Meaning

01
(01 hex)

Illegal
Function

The function code received in the query is not an allowable action for the slave. This may be because the function code is only applicable to newer devices, and was not implemented in the unit selected. It could also indicate that the slave is in the wrong state to process a request of this type, for example because it is unconfigured and is being asked to return register values. If a Poll Program Complete command was issued, this code indicates that no program function preceded it.

02
(02 hex)

Illegal Data Address

The data address received in the query is not an allowable address for the slave. More specifically, the combination of reference number and transfer length is invalid. For a controller with 100 registers, a request with offset 96 and length 4 would succeed, a request with offset 96 and length 5 will generate exception 02.

03
(03 hex)
Illegal Data Value A value contained in the query data field is not an allowable value for the slave. This indicates a fault in the structure of remainder of a complex request, such as that the implied length is incorrect. It specifically does NOT mean that a data item submitted for storage in a register has a value outside the expectation of the application program, since the MODBUS protocol is unaware of the significance of any particular value of any particular register.

04
(04 hex)

Slave Device Failure

An unrecoverable error occurred while the slave was attempting to perform the requested action.
05
(05 hex)
Acknowledge Specialized use in conjunction with programming commands.
The slave has accepted the request and is processing it, but a long duration of time will be required to do so. This response is returned to prevent a timeout error from occurring in the master. The master can next issue a Poll Program Complete message to determine if processing is completed.
06
(06 hex)
Slave Device Busy Specialized use in conjunction with programming commands.
The slave is engaged in processing a long-duration program command. The master should retransmit the message later when the slave is free..
07
(07 hex)
Negative Acknowledge The slave cannot perform the program function received in the query. This code is returned for an unsuccessful programming request using function code 13 or 14 decimal. The master should request diagnostic or error information from the slave.
08
(08 hex)
Memory Parity Error Specialized use in conjunction with function codes 20 and 21 and reference type 6, to indicate that the extended file area failed to pass a consistency check.
The slave attempted to read extended memory or record file, but detected a parity error in memory. The master can retry the request, but service may be required on the slave device.
10
(0A hex)
Gateway Path Unavailable Specialized use in conjunction with gateways, indicates that the gateway was unable to allocate an internal communication path from the input port to the output port for processing the request. Usually means the gateway is misconfigured or overloaded.
11
(0B hex)
Gateway Target Device Failed to Respond Specialized use in conjunction with gateways, indicates that no response was obtained from the target device. Usually means that the device is not present on the network.

 

 

Sumber:
http://ehelp.ingeardrivers.com/mbopc/trouble_shooting/error_codes/modbus_exception_codes.htm

http://www.simplymodbus.ca/exceptions.htm

Menggunakan Modbus Slave Multiple RTU

Modbus Slave Multiple RTU merupakan software yang berfungsi sebagai simulator pengganti PLC/Transmitter berbasis modbus. Jadi software ini menjadi PLC “Dummy” yang berisikan register-register modbus (Holding Register, Input Register, Status Register, dan Coil Register). Register tersebut dapat diakses menggunakan serial port dengan menggunakan PLC ataupun Komputer lain yang berfungsi sebagai HMI. Kegunaannya adalah untuk menggantikan PLC sebenarnya agar ketika membuat HMI akan lebih praktis ketika mencoba mengakses register. Kelebihan utama software ini yaitu dapat menjadi beberapa “dummy” sekaligus. cocok untuk membuat HMI pada SCADA system yang memiliki banyak RTU agar lebih praktis tidak memerlukan menggunakan banyak PLC yang sebenarnya.

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apa itu HART Communication ?

HART merupakan singkatan dari “Highway Addressable Remote Transducer” yang bisa diterjemahkan sebagai Transducer berada pada remote area (jauh) . HART adalah sebuah protokol yang dikembangkan oleh Rosemount yang dibuat berdasarkan standar komunikasi Bell 202.  HART merupakan open protokol yang berarti dapat digunakan dan dikembangkan oleh siapapun. HART memiliki dua modulasi sekaligus dalam komunikasinya yaitu menggunakan analog (4-20mA) dan Digital yaitu FSK (Frequency Shift Keying).

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Modbus Protokol dan Serial Standard

Modbus adalah sebuah open protocol yang menggunakan Layer Application atau Layer ke tujuh pada OSI Model (OSI: Open Systems Interconnection). Modbus di transmissikan melalui komunikasi Serial (Modbus RTU / Modbus Serial) dan juga Ethernet (Modbus TCP). Modbus pertama kali dikembangkan oleh Modicon (Saat ini Modicon dimiliki oleh Schneider Electric), yang juga merupakan PLC Pertama didunia yang ditemukan oleh Dick Morley. kemudian Modbus dikembangkan secara open oleh organisasi Modbus.org Modbus merupakan protocol yang paling umum digunakan dibanyak Device di brand apapun saat ini karena kemudahannya dan sifatnya yang open menjadikannnya Protocol favorite di Industrial Automation.

Setelah saya mempelajari sistem SCADA secara umum maka kemudian saya mempelajari dari masing-masing subsistemnya. dimulai dari bagaimana cara kerjanya, bagaimana cara berkomunikasinya, bagaimana cara mengambil data dan lainnya. Sampai akhirnya saya mempelajari Komunikasi Serial pada PLC dan bertemu dengan jenis-jenis standard industri komunikasi serial dan juga standar industri protokol untuk komunikasi data. READ MORE