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Implementation is, according to the IEC870-5-101 standard, as follows:
- Originator The originator ASDU address is not present.
- ASDU address is 1 byte, it is defined as the station address. ASDU addresses of all stations on one line must be different.
- Cause The cause of transmission is 1 byte (does not contain Originator ASDU address).
- Information The information object address is 2 bytes, it is defined as an I/O tag address.
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- Communication protocol "IEC 870-5-101 balanced", "IEC 870-5-101 unbalanced primary (Master)" or "IEC 870-5-101 unbalanced secondary (Slave)".
- Station The station address is a decimal number in range 0 - 255 and is used in the protocol as the ASDU address.
- The synchronization of the station real-time may be enabled also for the protocols "master" and "balanced - station A (controlling)". Set the synchronization period to a nonzero value. The synchronization is executed by ASDU 103 "Clock synchronization command" in the local time according to settings of D2000 System.
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Configuration dialog box - tab Protocol parameters.
They influence some optional parameters of the protocol. Following The following station protocol parameters can be set:
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| Parameter
| Meaning
| Unit
| Default value
|
|---|
| Link Address | Common link address. | - | 1 |
| Length of ASDU Address | Length of ASDU address. | 1/2 byte(s) | 1 |
| Length of Link Address | Length of common link address. | 1/2 byte(s) | 1 |
| Length of Info Object Address | Length of info object address. | 1/2/3 byte(s) | 2 |
| Length of Cause Of Transmission | Length of "Cause Of Transmission". | 1/2 byte(s) | 1 |
| Retry Count | Delay The delay between request retry in case of a communication failure. | - | 2 |
| Retry Timeout | Delay The delay between retry of call in case of a communication error. | ms | 100 millisecond |
| Wait First Timeout | Delay after sending the request before reading the response. | ms | 100 millisecond |
| Wait Timeout | Delay between response readings till its completing. | ms | 500 millisecond |
| Max. Wait Retry | Retry count of response reading till its completing. | - | 6 |
| No Data Timeout | Delay of next call "Request user data class 1/2" if no data have been received (only master). | ms | 300 millisecond |
| Inactivity Timeout | Interval of connection monitoring. If no valid data have not been received, station status will pass go to a communication error. Switching of redundant devices in case of SerialOverUDP Device Redundant line (only slave). | ms | 5 sec. |
| Moxa Timeout | Interval of The switching interval of the redundant devices MOXA NPort in case of communication error (only master, balanced). | sec. | 10 |
| Source Flags | Set flags FI..FL according to the source of line. If SerialOverUDP System+Line Redundant is used, the values will have these flags:- System A, primary line: FI
- System A, secondary line: FJ
- System B, primary line: FK
- System B, secondary line: FL
Note: Flag was used in communication with redundant systems to distinguish the wrong values that were sent by a partner system, which was supposed to be passive and not to send nothing. | - | NO |
| No Output Flags | Activation of parameter results in ignoring of flags FA..FH for output I/O tags. If this parameter is turned off, flags FA..FH are mapped to individual bits of a quality byte. | - | NO |
| Link Test Timeout | Interval of request sending "Test function for link" if timeout elapsed and no data telegrams was were transferred (only balancedbalanced only). | sec. | 10 |
Single Value In Spontaneous Answer | When sending spontaneous changes, these will be sent one-per-ASDU and they will not be cumulated into longer packets. Parameter The parameter was implemented to handle a bug in a particular TM1703mic. | - | NO |
| The class used for sending data (slave only slave). IEC 101 Master sends Class1 (high priority) and Class2 (normal) read data requests. Slave responds to them with data or a message that it has no data. In both Class1 and Class2 response responses there is an ACD flag that the slave has Class1 data available. If set, the IEC 101 Master will then request Class1 data. The parameter affects behavior as follows: - Class1&2 - IEC 101 Slave responds to Class1 and Class2 requests with data. The ACD flag sets if it has additional data.
- Class1 - IEC 101 Slave sends all data as Class1 and responds to the Class2 requests that it has no data. The ACD flag sets if it has additional data.
- Class2 - IEC 101 Slave sends all data as Class2 and responds to the Class1 requests that it has no data. The ACD flag sets to 0 (it does not have Class1 data).
- Prio reply - IEC 101 Slave sends responses to command ASDUs as Class1 data and other ASDUs (value changes, responses to Interrogation) as Class2ASDUs as Class1 data and other ASDUs (value changes, responses to Interrogation) as Class2.
Note: The responses to Interrogation (ASDU 100) and Counter Interrogation (ASDU 101) commands and all the values sent as a part of the response are also sent as Class1 data.
The default value of the parameter is Class1. | - | Class1&2
Class1
Class2
Prio reply |
| Discard received data before sending a response (only slave). If a correct request is received and the IEC 101 Slave wants to send a response, it will clear the incoming queue before sending, if the queue has data in it. This parameter serves as a protection against various data duplications due to communication partners partner errors (e.g. OSI Monarch with RtuPing running during switching of active communication line). | - | NO |
| Send Confirmation Command | Type of sent confirmation to write value (only slave, balanced). | -
7(CONF)
10(TERM)
7(CONF) and 10(TERM) | 7(CONF) |
| Accept Confirmation Command | Type of record confirmation to be accepted successfully (only master, balanced). | -
7(CONF)
10(TERM)
7(CONF) or 10(TERM) | 7(CONF) or 10(TERM) |
| Max. MTU | Limitation of data packet size (only slave, balanced). | bytes | 220 |
| Phys. Trans. Direction | Setting a bit DIR in balance mode (only balanced). | Station A(Controlling)
Station B(Controlled) | Station A(Controlling) |
| Single Byte Ack | Send single-byte ACK preferentially (0xE5). | YES/NO | NO |
| Interrog. Covers Counters | Send the call 100 and counter values on general interrogation (only slave, balanced). | YES/NO | YES |
| Send EOI | Send "end of interrogation command" to all ASDU (only slave). | YES/NO | YES |
| Send Interrog. in Sec. Direct. | Send general interrogation command in case of slave or balanced controlled station B (only slave, balanced). | YES/NO | NO |
| Communication for system Sinaut Spectrum, which requires non-standard behavior on redundant lines (different from the Norwegian convention). | YES/NO | NO |
System Redundancy: Manages A Status Address | Address of station and output I/O tag with the status of system redundancy. The format of the address is Station Address, I/O tag address, for example. "1,1003".
Parameter The parameter is useful for SerialOverUDP System&Line Redundant lines, which enable communication with two independent control systems (e.g. main dispatching SED in Žilina and backup dispatching SED in Bratislava).
Parameter The parameter enables one to ignore values that are received from the control system, which is inactive just now, providing that the application knows which one is active or inactive. It can know it e.g. based on the value of the input I/O tag with the defined value.
This feature (information about active control system) will work providing that station with the output I/O tag of Dout type exist with the same addresses as is defined in this parameter and the application must write True into it if "System A" is active, or False if "System B" (configured on the system redundant line) is active. | - |
|
| Full Debug | High level of communication tracking, the loaded received values of I/O tags and other debug information are is shown. | YES/NO | NO |
I/O tag configuration
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*** -
ASDU 18,
39 and
40: value of byte SPE(ASDU 18,39) or OCI (ASDU 40) sets the attributes FLI (0.bit), FLJ (1.bit) up-to FLP (7.bit).
Value The value of byte QDP sets the attributes FLA (0.bit), FLB (1.bit) up-to FLH (7.bit), following 2 bytes (CP16Time2a) are interpreted as
a positive number (0-60 000) into
the value of I/O tag with value type Ci/Ai or as
a relative time (0-60 seconds) into
the value of I/O tag with value type TiR.
Note 2: When using the system and line redundant categories of lines, the status of line and station is formed by a logical sum of all used elementslines. It means, that if the redundant system consists of four lines and just one line is working, the status of station and line is all right. The status of lines is presented with the help of special input or output I/O tag (of integer and real type, i.e. Ai/Ao/Ci/Co). Name The name of this I/O tag has this format: [line_name of line]_SystemStatus (e.g. for line L.Test it is M.Test_SystemStatus). The value of the I/O tag represents the binary format of the status of N-tuple lines. If the first three lines are okay but the last one does not work (SystemB/SecondaryLine) i.e. [FALSE,TRUE,TRUE,TRUE], I/O tag has the value 0b0111, i.e. 7.
The order of lines mapped to individual bites bits is [SystemB/SecondaryLine, SystemB/PrimaryLine, SystemA/SecondaryLine, SystemA/PrimaryLine].
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