Technical Data Opc Server
GeneralThe Tani OPC Server is a multi protocol and multi opc OPC server. It allows access to coltrollers and devives from various manufactuters. It is easily to configure. It offers a lot of diagnostics functions.
- OPC Pipe Open interface
- OPC UA (Unified Architecture)
- OPC DA (Classic OPC over DCOM, available under Windows only)
All OPC interfaces are working locally in one PC or over network.
in case of Classic OPC Classic please do not use DCOM over networks, but it will be supported.
OPC UA supports the fast binary protocol. Security is not supported. Data access data items are supported up to 200K each.
OPC UA functionality and limitations
The OPC UA implementation conforms to the specification 1.04.
The OPC UA Standard Model is supported, some extensions exist.
An internal discovery server is active on standard, it supports multicast discovery also. It can be used as a global discovery server. Alternatively an external discovery server can be configured.
The session timeout will be limited to one hour.
The server and client certificate will be renewed if the Tani self signed certificate is used. All other certificates remain unaffected on expiring. The certificate validity is checked all 12h. It will be renewed seven days before it expires. Running connections will not be affected, new connections will use the new certificate.
AddNodes is supported with the following restrictions:
- AddNodes is possible only in Objects.Topics.Memory tree
- Reference type must be OpcUaId_Organizes
- NodeId can't be specified
- BrowseName can't contain a dot
- NodeClass must be Variable or Object
- NodeAttributes for Variable:
- DisplayName: unspecified or equal to BrowseName
- Description: unspecified or any text
- Value: is ignored; new variables will always be initialized to 0 (if numeric) or "" (if string type)
- OpcUaType_SByte, OpcUaType_Byte
- OpcUaType_Int16/32/64, OpcUaType_UInt16/32/64
- OpcUaType_Float, OpcUaType_Double
- OpcUaType_LocalizedString. This will be handled outside OPC UA as a normal string. The LocaldId always is a null string
- OpcUaType_ExtendedObject, OpcUaType_ExtendedObjectEx. Mostly this are structures. One of the structure types under Types -> DataTypes -> BaseDataType -> Structure -> UserStructures; these are the structures known to the PLC Engine core.
- if the structure is given both here and via TypeDefinition, both settings must match
- if unspecified, OpcUaType_Byte or the structure type of the TypeDefinition is used
- ValueRank, ArrayDimensions: unspecified (= scalar), scalar or a one-dimensional array of any size
- AccessLevel, UserAccessLevel: unspecified or (OpcUa_AccessLevels_CurrentRead | OpcUa_AccessLevels_CurrentWrite)
- MinimumSamplingInterval: unspecified or 0
- Historizing: unspecified or 0
- WriteMask, UserWriteMask: unspecified or OpcUa_NodeAttributesMask_Value
- NodeAttributes for Object:
- DisplayName: unspecified or equal to BrowseName
- Description: unspecified or any text
- EventNotifier, WriteMask, UserWriteMask: unspecified or 0
- TypeDefinition for Variable:
- one of the structure types under Types -> VariableTypes -> BaseVariableType -> BaseDataVariableType -> UserStructures; these are the structures known to the PLC Engine core.
- TypeDefinition for Object:
- Each RPC as a calling queue of 10. If the requests are coming faster before handled they will return a memory error.
Controller InterfacesAll controllers will be connected over network. Often this is Ethernet, WLAN or other networks.
Configuration InterfacesThe configuration can be done with the shipped configuration software or over OPC with the System topic.
The connection for the configuration is encrypted with TLS 1.2. The encryption can be switched off for usage in countries where encryption is forbidden.
Netzword Redundancy for connections to controllers and devices
Connections to devices and controllers are supporting network redundancy.
Double and triple redundancy can be selected.
Two redundancy operation modi are possible.
In dynamic redundancy any of the connections is working as master. If it breaks another connection becomes the master connection.
In static redundancy the first connection is the master. If it breaks another connection becomes the master. If the first connection works again it will become the master connection again.
The connections of the redundancy should work on different netaork adapters.The adapters need different IP subnets for proberly work..
Controller Types and Controller Protocols
- Siemens S7 a través de RFC1006 y Sinec H1. Apoyado son S7 200, 300 y 400, 1200, 1500. En el S7 1500 y 1200 la familia de los bloques de datos optimizados son compatibles, todos los símbolos y los comentarios se ojearse. CP Siemens o la interfaz Ethernet de la placa de la CPU puede ser usado. Mainstream MPI Gateways como Hilscher de conexión de red, Helmholz Netlink, IBH Softec netlink, INAT Echolink, Proceso Informatik S7Lan o Softing de conexión de red son compatibles, también. sistemas compatibles S7 como los VIPA SPEED7 se puede utilizar, también.
- Siemens S5 over RFC1006, PLC Header, RAW or Sinec H1. Supported are Siemens CPs, INAT CPs, Helmholz CPs, IBH Softec S5Net, Process Informatik S5Lan.
- Rockwell Compact Logix y Control Logix, Firmware antes y después de versión 21.
- varios Modbus/TCP devices
- Phoenix Contact
- Raw data.
BACnet will be used over IP / UDP.
Maximum length of strings: 256 Byte
Status text elements are supported (state_text)
Supported charsets: UTF-8, UTF-16, Latin-1
Unions ("Choice") and structures ("Sequence") are existing for important values. All unimplemented instances will not be shown.
Enum values are represented as UINT32. Some special enum are handled as bool. Values in "Octet-String" and "Bit-String" can be written in whole only.
BBMD will be used during the connection establishing and the device search
if the devices do not be all in the same collision domain.
BACnet uses broadcast during ist connection establishing.
There are several procedures in BBMD:
- Search ussing broadcast.
- Search using the IP device address, receive the BACnet ID.
- Search using the BACnet id, receice the IP address.
COV represents the event subsystem of BACnet.
Events will be offered in browsing the variables, they will be subscribed.
If the device will send the data the event will be generated.
Because BACnet is working with UDP the COV receive can not be guaranteed. Tani is offering an option: If no event will be received during the reconnection time from the configured connection it will be polled. If the value did not change no event is send for this polling.
BACnet - Writing values with priority-arrayThese object types have a priority-array in addition to their present-value property:
- priority-array is read-only and contains 16 entries (that can be a valid value or NULL).
- present-value is read-write and contains 1 value (the non-NULL value with the lowest priority from priority-array, or the value from relinquish-default if no non-NULL value in priority-array exists).
- Writing to present-value uses an optional priority parameter to write to the correct entry in priority-array.
- priority-array is read-write and contains 16 structure entries with 2 fields:
* Value: the data value in this entry (or 0 if no valid value is present)
* ValueValid: a boolean value; 1 if Value is valid, 0 if not (NULL value).
- Writing to an element of priority-array implicitly uses a "write present-value with priority" operation to change the desired value.
- Writing to priority-array[i].Value always creates a non-NULL entry.
- Writing 0 to priority-array[i].ValueValid creates a NULL entry.
- Writing 1 to priority-array[i].ValueValid creates a non-NULL entry with value 0 (this is usually not very useful).
- Writing to priority-array[i] (as a structured data type) creates a NULL entry when ValueValid is 0. Else a non-NULL entry with the specified Value is created.
- present-value is read-write and contains the value obtained by BACnet protocol.
- Writing to present-value doesn't transfer the priority parameter. The BACnet device will implicitly write to priority entry 16 in this case.
This mechanism was chosen to allow choosing the write priority via OPC without changing the read syntax for present-value property. This also allows writing NULL values via OPC.
The OPC Server contains a logger for diagnostics purposes during plant startup. The logger can be configured. The system load can be big if all controller ; data are logged.
Maximum number of configurable connections: 1000.
Maximum length of a single item: 4GB.
Maximum number of elements each connection: 4 Million.
Maximum number of elements (Items): 16 Million.
Maximum OPC groups each connection: 100.
Maximum number of passive connection for each port is 999.
The OPC synchronous functions returning a bad quality immediately if the PLC connection is not established.
Changes in controller configuration will be checked all 10 seconds.
Fields can be up to 64K in length each.
Multi dimensional arrays can have up to three dimensions.
SpeedThe throughput will be mainly limited by the controller speed or the reaction time of OPC applications.
Read requests to the controller will be optimized as much the controller is supporting this. For that elements will be collected to blocks reading more than requested, but not for inputs and outputs. These optimizing can be affected by configuration separately for each connection. Optimizing can be switched off, too.
Write requests to the controller are collected or handled in that order the application did called the system.
On OPC all optimizing the individual OPC uses is supported.
The normal time in cyclic controller requests is 50ms.It can be faster if the controller polling interval is set to zero.
Only data are sent to OPC which did change in the controller between two read requests.
Field and text optimizingsThe from version 1.8 existing field optimizings will prevent reading the long fields too often, the index is requested on standard only.This optimizing bases of the fact that the index does net changed too frequently.
Usage of memory
- Program code: A minimum of 6MB is used. The exactly memory usage is depending of the internal behavior of the operating systems. So dynamic libraries are loaded once for all running instances using them. Example: If the standard library is not loaded already it will use additional 4MB of memory.
- User data: The minimum data usage is 2MB internally. Additional the controller data are held in memory for comparing new data. Each item uses the length of data and additional 64 bytes. Each configured connection occupies 4KB.
Usage of computation timeThe consumed computation time is depending on the load with communication. Most the time it will be waited for controller data or OPC application reaction.
All software is working with events. This maximizes the throughput and minimizes the usage of computation time.
Multiple CPU are supported. Up to ten CPU will be used, the main work will be handled by three CPU.
InstallationThe installation does depending on the product install multiple parts separately. On uninstall not all products are deleted automatically. But all installed products can be deleted over the menu or the software part in the system control manager.
The user settings will be preserved and not deleted during uninstall.
- Windows 7, 8, 8.1, 10. Older versions as XP and Vista also. 64 and 32 bit.
- Windows Server 2008, 2012, 2016 and 2018
- Linux on the Raspberry and Odroid computers
- Linux on the Wiesemann & Theis pure.box 3
- Linux on a PC with Debian, Ubuntu, Suse, Redhat and other Distributions
- Linux 64 Bit as Docker or Kubernetes Container
- OPC DA will require Microsoft Windows. All from Microsoft supported operating systems for Intel and all user languages will be supported. The latest service pack must be present.
- Under Windows the OPC server are working as service, Linux runs them as daemon.
- The Raspberry version supports all Linux distributions offered for this platform.
- All other will run under lot of operation systems also, mostly Linux based.
- Under Linux the OPC Server needs a POSIX compatible System. The Standard Library needs V2.2 as minimum. The configuration software is bases on KDE 4 and is needing the kdelibs. Please use actual distributions like Debian, Ubuntu, Suse, Redhat or similar.
- Tested is: Windows Intel 32 and 64 bit, Linux Intel 32 and 64 Bit, Linux MIPS CPU, Linux ARM 32 and 64 Bit CPU.
- Running in virtual machines is supported. Docker containers are supported, too.
- Windows 7 needs as minimum service pack 1 for using the drivers.
- All configurations are compatible to all OPC servers, also over operating systems.