Module | Name | Version | License | Source | Languages | Platforms | Type | Author | Description |
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SMH2Gi | Segnetics SMH2Gi | 1.0 | GPL2 | daq_SMH2Gi.so | en,uk,ru,de | x86,x86_64,ARM | DAQ | Roman Savochenko | Data acquisition and control by Segnetics SMH2Gi (http://segnetics.com/smh_2gi) hardware interfaces and modules.
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The module provides functions of integration of OpenSCADA to environment of programming panel controller with OS Linux SMH2Gi (Fig.1) from firm Segnetics. The module was developed for project "Automatic system of control of vacuum technological process".
"SMH 2Gi" — programming logical controller, aimed for automation of engineer systems of buildings and technological processes of industry.
Specifics of the controller "SMH 2Gi":
Table 1: SMH2Gi specification
Naming | Type (Value) |
---|---|
Supplying | |
Nominal supplying voltage | 24 V of DC ± 5% |
Allowed range of the supplying voltage | 18…36 V DC |
Power consumption | No more to 5 W without "МС" module and more then 10 W with the "МС" connection |
Processor, memory | |
Control processor, bus band width | Freescale iMX27 with the core ARM926EJ-S, 32 bit |
Working CPU frequency | 400 MHz |
Operational system | Linux 2.6.29 |
The operational memory type and size | 64 Mbyte (or 128 Mbyte) DDR dependent from the model |
Content memory type and size | 128 MByte NAND Flash |
Interfaces | |
RS-232 | Speed – from 2400 … to 115200 bit/s; without optical isolation; protocol – Modbus RTU; socket to connection – terminal block (needed additional coupler to DB-9) |
RS-485 | Speed – to 2400…115200 bit/s; with optical isolation; protocol – Modbus RTU; socket to connection – terminal block |
USB Host | Support standard USB 2.0; socket for connection – USB type A (big socket); |
USB Device | Socket for connection – USB type miniAB (small socket) |
Ethernet | Embedded, 10/100Mbit; supported protocols: FTP, HTTP and other. Socket for connection – type RJ-45 |
Additional network modules | LONworks, modules for specific order |
User interface | |
Keyboard | 23 buttons |
Graphical display | Type – STN, monochrome 192 х 64 dots; diagonal - 4.1" |
Sound alarming | Missing |
Discrete inputs | |
Inputs number | 3…5 galvanic isolated inputs (the number configures in a program) with counter inputs support up to 10 kHz |
Type of the galvanic isolation | Grouped |
Triggering voltage's levels | Closed "dry" contact ≤1.1В. Opened "dry" contact ≥4.2В DC (lesser to 50В) |
Discrete outputs | |
Number and type: | 2 transistor outputs (without a galvanic isolation) |
SMH 2Gi – 0XXX – XX – Х | 1 optorele |
SMH 2Gi – 1XXX – XX – Х | 2 optorele |
Working voltage range | For outputs on transistors: 0…36 В DC. For outputs on optorele: 0…36 В DC; 0…25 В (rms) AC. |
Switched current, lesser | 0.4 А to each output |
Switching time, lesser | 1.5 ms |
"Contacts" resource, switches, lesser | No limited |
OpenSCADA project assembling for an environment of processor ARM926EJ-S and OS Linux grounds on GCC-4.3.2, Glibc-2.8, Binutils-2.18 and Kernel-2.6.29 was done long enough and it described by the link. But in an exploitation process was is a need of a direct data acquisition from modules "MC" and "MR", and interaction with the original environment "SMLogix".
At all we need to note that the original environment of SMH2Gi represent by two processes: "mbs" and "logix". Where "mbs" performs a function of acquisition of modules MC, MR and other interfaces and "logix" performs programs execution and visualization to the embedded screen. On the modules MС and MR configuring to frequent acquisition the process "mbs" can use more then 30% of the processor's resources into the system loading then it is leave few resources to all other tasks, and it mostly reloads the processor. Replacing the process "mbs" (disabled into the file "/projects/start") into OpenSCADA allow you to remove that kind system loading by using function select() of the operation system at work with the serial interfaces. And working with the process "logix" by the shared memory allow you to bypass a problem of a low priority of the network interface.
Into this version implemented the data acquisition and the values transmission to the process "logix" by the shared memory, also the values acquisition and transmission from/to modules MC and MR.
The module implements functions of horizontal redundancy that is accordance working with a remote station of the same level.
To the modules MC and MR working needs a previous initial procedure which must send tune-request, specified to the module concrete model. Next to a data request/send you need an information about the module structure. This kind information is contained into INI-files, per file to the device. Folder with INI-files specified into tab "SMH2Gi" by the module page (Figure 1), and the typical *.INI files archive, adapted to OpenSCADA needs, allowed here.
The controller's object describes a task of SMH2Gi data acquisition of the two types: "SHM" and "MRC" (Fig. 2).
In assistance with the tab you can set:
Due to the fact that the modules MC and MR needs to previous reset and next send the tune-request then an independent physical connection, disconnecting and also object single module enabling/disabling often impossible without the controller's object stopping and disabling at all.
The parameter's object is a direct agent of the data source, in our case this is shared memory and MC, MR modules. Each the type represented into different way.
The parameter's type "Shared memory (SHM)" uses for interaction with the process "logix" through exchanging by variables. The parameter's object configuration tab of this type shown on Figure 3. The process "logix" provides four variable's types with it reflection to OpenSCADA data source's attributes into next way:
In assistance with the tab of parameter's object configuration you can set:
The tab "Attributes" example shown into Figure 4.
The parameter's type "Modules MC and MR (MRC)" uses for access to the modules MC and MR data. The parameter's object configuration tab of the type shown on Figure 5. The parameter's type is generic for the modules MC and MR by mostly like working with a difference only it's installation bus, that is taken in account by the module address sign.
In assistance with the tab of parameter's object configuration you can set:
The tab "Attributes" example shown into Figure 6. On Figure 7 shown tab "Configuration" which contains all configuration fields of the tune-request and the discrete signals inversion.
INI-files archive with configuration of the modules MC and MR: File:SMH2Gi_ini.tgz
Modules/SMH2Gi/en - GFDL | May 2024 | OpenSCADA 0.9.7 |