História stránky

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Note: Single bites bits of the byte, which informs us on quality (SIQ for ASDU 1,2,30; DIQ for ASDU 3,4,31; QDS for 5..14,20,32..36) are mapped into the flags FLA (0.bit), FLB (1.bit) ..FLH (7.bit) flags except the bits that are directly set by the value of variable ( SCO bit 0, DCO and RCS bity bits 0-1). After receiving the answer (a positive/negative one), the flags FLA..FLH flags are set according to bits of "status" byte.

For example:
for ASDU 4: FLA=DPI bit 0, FLB=DPI bit 1, FLC=0, FLD=0, FLE=BL bit, FLF=SB bit, FLG=NT bit, FLH=IV bit.
for ASDU 16: FLA..FLE Sequence number bity 0..4, FLF=CY bit, FLG=CA bit, FLH=IV bit.

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To set the bites bits of "status" byte (SCO for ASDU 45,58; DCO for ASDU 46,59; RCO for ASDU 47,60; QOS for ASDU 48..50,61..63), there are used the flags FLA (0.bit),FLB (1.bit) ..FLH (7.bit) are used, except the bitesbits, which are directly set by the variable value (SCO bit 0, DCO and RCS bites bits 0-1). Having received a response (positive/negative), the flags FLA..FLH are set according to the bites bits of the "status" byte.

When sending commands (ASDU 45-64), the value of 6 [Activation] is send sent as a CauseOfTransmission. Expecting a The expected response from the controlled station depends on the parameter the Command Confirm parameter. There are the following possibilities:
- writing is successful , if the packet with RSN confirming the SSN packet with the logwrite command
- writing is finished, if there is a response with CauseOfTransmission=7 [Activation Confirmation] and/or with 10 [Activation Termination]. Success/Unsuccess failure depends on the setting of the P/N bite in CauseOfTransmission.

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**** - ASDU 250 can be used for communication with Ipesoft 870-5-104 Server. The command will ask for historical values (within any specified interval) from the server, which get back will arrive as ASDU 251 (or newer ASDU 249 that use 64-bit values for improved precision, if the protocol parameter D2H64 is enabled on the server). The reading of the archive values can be executed by means of the TELL GETOLDVAL command GETOLDVAL with the parameter containing the name of the I/O tag or station (in this case, there are read the values of all I/O tag in successive stepsare read gradually, i.e. reading another of the next tag starts after termination the reading of currently read current tag is done).
Response for ASDU 250 is again ASDU 250 (with CauseOfTransmission=7) and with the return code:

• 0 - the successful start of reading the history
• 1 - the history for the required tag doesn't existsexist
• 2 - the history for the required tag is not available (the archive does not run)

Further follows Next (is the return code was 00) the ASDU 251 with archive data will be sent and the termination ASDU 250 with CauseOfTransmission=10.

Establishing a connection:

process The D2000 KOM process is connecting to the TCP port and sends a StartDT Act U-frame StartDT Act, then a StartDT Con U-frame is waited expected as a reply.

For all the stations with a defined synchronization (see the article below), there is send an ASDU type 103 [Clock synchronisation command] with CauseOfTransmission=6 [Activation] is sent, there is expected and a reply in dependence (depending on the Command Confirm parameter) is expected.

Then there is sent a sequence of 0 up to N I-frames with ASDU 100 [Interrogation Command] and ASDU 101 [Counter Interrogation Command] is sent, both with CauseOfTransmission=6 [Activation]. The I-frames are sent for each station with at least one input I/O tag (i.e. Ai, Di, Qi, Ci). As a response, there is expected (in any order):

• receiving reception of frames with ASDU 100 [Interrogation Command] and with CauseOfTransmission=7 or 10 (depends depending on the Command Confirm parameter)
• receiving reception of frames with ASDU 101 [Counter Interrogation Command] and with CauseOfTransmission=7 or 10 (depends depending on the Command Confirm parameter)
• receiving reception of current values of all I/O tags.

The other side can also sent send frames with ASDU TypeIdentificator=100 and CauseOfTransmission=10 [Activation Termination]. However, but the process D2000 KOM process does not consider it to be an error , if such no frames will not receive. are received. The order of sending ASDU 100 and 101 sending order as well as disabling their sending is defined by the parameters Order of IC and Order of Counter IC parameters.

Clock synchronisation: Sending ASDU type 103 [Clock synchronisation command] is performed during initialization (after sending StartDT and before sending Interrogation Command). The synchronization is sent for the stations, with the checked parameter Enable in the tab Enable parameter checked in the Time parameters tab. ASDU type 103 is sending sent regularly with a defined period.

Forced disconnection: If all stations on the line are in the simulation mode or the communication is stopped for them, the line will be disconnected (communication socket will be closed). If the simulation is disabled for at least one station and the communication is not stopped for it (the the Parameters tab Parameters of Station type object), the line will be connected again (and there will be sent Interrogation Command and/or Counter Interrogation Command will be sent to the active station). After turning on every next stationenabling communication for further stations, Interrogation Command and/or Counter Interrogation Command will be sent to the stationthese stations, see the next articleparagraph.

Forced sending of Interrogation Command and/or Counter Interrogation Command: If a station is in the simulation mode and the communication is not stopped for it (the the Parameters tab Parameters of Station type object), the process D2000 KOM process sends Interrogation Command and/or Counter Interrogation Command (see the parameters Order of IC, Order of Counter IC).

D2000 system also supports the balanced mode. In the mode, the task of controlled and control stations is changed. That timeIn this mode, the D2000 system receives commands and confirms them. The balanced mode may be used only when it is supported by partner station. An advantage is that D2000 system sends the current status of output I/O tags (defined as ASDU 1-40) as a reply to ASDU 100 [Interrogation Command] and 101 [Counter Interrogation Command] requests. It is still suitable to configure single-shot commands as ASDU 45 - 64; they are not repeated after re-establishing the connection.
As the protocol supports the balanced mode (partly it is a server), there are valid the rules of server protocols apply to it.
The output tags, which are configured as ASDU 1-40, do not switched to go through the Transient status (i.e. they are considered as if in the configuration of I/O tag, tab Output controlcontrol tab, the I/O tag output mode is set on to Command). The record writing is considered to be successful if there is the connection with server at the time of recordwriting, otherwise the record writing is unsuccessful.

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Communication partners

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• Communication line category: TCP/IP-TCP or TCP/IP-TCP Redundant.
• TCP parameters - server parameters are mandatory:
  • Host: string containing at most 80 characters – server name in form of INET (name or numerical address a.b.c.d). In case of redundant systems, multiple names/addresses separated by commas can be entered.
  • Port: TCP port number (0..65535)
  • Line number: is to be used as the Originator ASDU address (1 byte, 0-255)

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• Communication protocol: IEC870-TCP.
• Station address a decimal number within the range of 0..65535 , defines the ASDU address.

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Note 3: Starting with D2000 version 7.02.004 if a TCP Redundant line category is used, the flags FLC and FLD flags are used in the value of communication stations for indication of functionality of primary (FLC) and secondary (FLD) communication path. If these flags are set, the respective communication path is non-functional. For example, if the value of communication station is StON and FLC flag FLC is set it means that only secondary communication path is functional.
For lower versions of D2000 only partial detection of a broken communication path is available when using the parameter the Strict Redundancy Connection Signalisation parameter.

The Browse button opens a browsing dialog dialogue for the station address. If the communication is functional, a dialog dialogue with the ASDU addresses received so far is displayed. The Refresh button can be used to clear the list of received ASDU addresses.

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