 | M&M FDT 1.2.1 Online Specification |
Interfaces and Methods - Schemas - FDT Specification - Quicklinks - Abbreviations
6.1 DTM Peer To Peer Communication
6.1.1 Establish a Connection between DTM and Device
6.1.2 Asynchronous Connect
6.1.3 Asynchronous Disconnect
6.1.4 Asynchronous Transaction
6.2 Nested Communication
6.2.1 Generate Systemtopology
6.2.2 Establish a Connection between DTM and Device
6.2.3 Asynchronous Transaction
6.3 Topology Scan
6.3.1 Scan Network
6.3.2 Cancel Topology Scan
6.3.3 Provisional Scan Result Notifications
6.3.4 Scan for Communication Hardware
6.3.5 Manufacturer specific Device Identification
6.4 Registration of Protocol Specific FDT Schemas
6.5 Configuration of a Fieldbus Master
6.6 Starting and Releasing Applications
6.7 Channel Access
6.8 DCS Channel Assignment
6.9 Printing of DTM Specific Documents
6.10 Printing of Frame Application Specific Documents
6.11 Propagation of Changes
6.12 Locking
6.12.1 Locking for Non Synchronized DTMs
6.12.2 Locking for Synchronized DTMs
6.13 Instantiation and Release
6.13.1 Instantiation of a New DTM
6.13.2 Instantiation of an Existing DTM
6.13.3 Instantiation of a DTM User Interface
6.13.4 Release of a DTM User Interface
6.14 Persistent Storage of a DTM
6.14.1 State machine of instance data
6.14.1.1 Modifications
6.14.1.2 Persistence
6.14.2 Saving Instance Data of a DTM
6.14.3 Reload of a DTM Object for Another Instance
6.14.4 Copy and Versioning of a DTM Instance
6.15 Audit Trail
6.16 Comparison of Two Instance Data Sets
6.16.1 Comparison Without User Interface
6.16.2 Comparison With User Interface
6.17 Failsafe Data Access
6.18 Set or Modify Device Address With User Interface
6.19 Sets or Modifies Known Device Addresses Without User Interface
6.20 Display or Modify All Child Device Addresses With User Interface
6.21 Device Initiated Data Transfer
6.22 Starting and Releasing DTM User Interface in Modal Dialog
6.23 Parent Component Handling Redundant Slave
6.24 Initialization of a Channel ActiveX Control
6.24.1 Supports IFdtChannelActiveXControl2
6.24.2 Does Not Support IFdtChannelActiveXControl2
6.25 DTM Upgrade
6.25.1 Saving Data from a DTM to be Upgraded
6.25.2 Loading Data in the Replacement DTM
6.26 Usage of IDtmSingleDeviceDataAccess::ReadRequest / Write Request
6.27 Instantiation of DTM and BTM
6.2 Nested Communication
This chapter is important for DTM developers who support a device with gateway functionality (e.g. Remote I/O). This chapter describes the communication function calls from the point of view of a developer of a communication component.
Nested communication is used to establish the connection to a device on a sub
system. For example, a DTM calls a field device which is connected to a channel
of a Remote I/O.
The requirement to this architecture is that a DTM must not know anything about
the kind of the overlaying system. Nevertheless, the structure of the sub system
is well known to Frame Application and DTMs.
The DTMs which have gateway functionality (Remote I/O) have to provide an
IFdtChannel with communication interfaces for each channel with gateway
functionality.
Furthemore always the parent ( DTM with gateway functionality or, at least, the
Frame Application) is responsible for the communication addressing of its
sub-devices. Therefore it has to set parameters like ‘tag’ and ‘BusInformation’
according to the communication protocol. (see also: IDtmParameter::SetParameters())
System-topology for the following examples:
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© by M&M Software GmbH, parts of this website taken from FDT Interface Specification Version 1.2.1, © by FDT Group, AISBL.
This website is published for support of M&M products as granted in license conditions, chapter 2.1.
Last updated 2015-02-05 15:17
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