SINAUT 8-FW PCM : Telegram structure

 

Transmission of a single telegram byte

The digital signal is represented by a "0" or "1" ( + / - ). Each pulse is of the same length, irrespective of it being a NULL or ONE. The complete message is subdivided into 11 bit data strings.

Each string consists of the same number of pulses of equal strings : one start bit, 8 data bits, one parity bit and one stop bit. The data bits and parity bit may either take the low level state ( logical 0 ) or high level state ( logical 1 ).

 

Telegram format with variable length

The length of the information within the message is variable. In addition to this information block of variable length, the message has also a header and address block of fixed length.

The telegram with variable length is used for data transmission of user data between master station and slave station and in the opposite direction.

 

Data telegram SINAUT 8-FW PCM :

 

Station number

The station number, 7 bit binary coded number gives the possibility to address up to 127 substations ( station 1... 127 ). The master station has the station number = 0.

 

TGE bit ( Telegram Group End )

The TGE bit is a 1 bit marker used in monitoring direction and shows that a substation in polling mode has transmitted its last message. ( only used in multi-point systems )

 

MSC number ( Message Sequence Code )

The MSC enables the possibility that any spontaneous message which one has been corrupted during transmission can be repeated. The substation retains the last 30 records in case it receives a repeat request ( CDH 02 ).

During start-up the substation transmits all messages with MSC = 31, until the masterstation has sent a start-up acknowledgement command ( CDH 03 ). In the subsequent normal operation the messages of the substation contain a MSC from 1 up to 30.

Spontaneous and housekeeping messages always increase the MSC number, interrogated messages may or may not increase the MSC number ( parametrizable in the substation ).

For the Messages in control direction the MSC = 0 is only used.

 

OFL bit ( Overflow )

The overflow bit is set by the substation if the MSC-Buffer is not acknowledged ( CDH 02 ) and therefore overflows.

 

DA ( Data type )

The Data Type indicates in monitoring direction the source of the data and in control direction the destination of the data.

DA = 0 : Housekeeping   ( CDH.. / MDH.. )
DA = 1 : Spontaneous process messages  ( CD.. / MD.. )
DA = 2 : Cyclic process messages   ( only in monitoring direction )
DA = 3 : Polled process messages  ( indications during general interrogation )

 

Message number ( address )

The 10 bits allow an adressing of 1024 bytes in monitoring and control direction. Each information byte in a system, main- or subsystem, is indicated by a record number within the 1024 byte input- or output area.

If a message is transmitted with an information block that consists of just one information byte, then the information byte location number is identical to the message number. If however, the information block consits of more than 1 byte then the number of the first byte is the message number and increases for the following bytes continously by one.

 

RL C ( Record length / Compression bit )

The record length shows the number of bytes in the information block. The actual length is represented in 2 bits ( RL ), the 3rd bit is a compression bit ( C ). If a message has the C bit set, this means that the useful information block is either 9, 36 or 72 bits long.

2 2 2 useful information [ bits ] transmission [ bits ]
0 1 0 8 9
0 1 1 9 9
0 0 0 16 16
1 0 0 32 36
1 0 1 36 36
1 1 0 64 72
1 1 1 72 72

 

System number ( Processor )

Indicates in monitoring direction the source and in control direction the destination of information. ( system of the substation )

System = 0       : Main System ( MASY )
System = 1... 6 : Subsystem 1... 6 ( SUSY 1... 6 )
System = 7       : reserved for internal use

 

Information type identification ( TypeID ) :

Unfortunately the TypID is not recognizable out of the SINAUT 8-FW message. In the process-system it is associated with the message number. In order to display in LIAN 98 the particular informations ( messages, measurands, ... ) not only e.g. hexadecimal but also in a easily readable plain text, an unambiguous TypID is defined. Organizational messages and messages in control direction are not affected.

Via the <parameter list> the correct TypeID can be assigned to the telegram number. The TypeID value ZERO is not used.

The following table shows the type identification numbers for process information in control- and monitoring direction defined in LIAN 98.

 

Process information in monitoring direction :

 

TypeID    
1 4 Bit pattern, 8 bits each MD 01
2 1 Bit pattern, 32 bits MD 02
3 Indications, 1 byte MD 03
4 Indications, 4 bytes MD 04
5 Indications, 8 bytes MD 05
6 Indications, 1 byte + realtime MD 06
7 1 Measured value , 8 bits MD 07
8 4 Measured values, 8 bits each MD 08
9 8 Measured values, 8 bits each MD 09
10 2 Measured values, 11 bits + sign MD 10
11 4 Measured values, 11 bits + sign MD 11
12 Fleeting or short duration indication, 4 bytes MD 12
13 Fleeting indication, 1 byte with time MD 13
14 Transformer tap, 6 bits with running contact, 4 bytes MD 14
15 1 Metered value, BCD coded MD 15
16 1 Metered value, binary coded, 28 bits + 4 bits flags MD 16
17 4 Measured values, 11 bits + sign, with time stamp MD 17
...    

 

Process information in control direction :

 

65 Switching command, 1 byte + flags CD 01
66 1 Set point analogue, 8 bits + sign CD 02
67 4 Set points analogue, 8 bits + sign CD 03
68 8 Set points analogue, 8 bits + sign CD 04
69 1 Set point digital, 8 bits CD 05
70 1 Set point digital, 16 bits CD 06
71 1 Set point digital, 32 bits CD 07
...    

 

Housekeeping records in monitoring direction :

 

Mess. no.    
512 Test record MDH 01
515 Single error record, Substation MDH 02
515 Single error record, Masterstation MDH 03
767 Check before operate, ACK message MDH 04
768 ACK to Threshold value operation MDH 05
769 ACK to Smoothing factor operation MDH 06
770 ACK to Time synchronisation ( precision resolution time ) MDH 07
770 ACK to Setting minutes MDH 08
770 ACK to Setting date/ time MDH 09
772 ACK to Start-up interrogation MDH 10
773 NACK to Remote parametrization MDH 11
780 Memory contents transfer, 4 or 6 bytes MDH 12
781 Error bit pattern transfer ( ZFBIT ) MDH 13
782 Cause of last stop in the substation MDH 14
1012 Error message from the secondary polling levels MDH 15
1016 System error Bit Map transfer ( ZBBIT ) MDH 16
1020 System error Bit Map transfer ( ZBBIT FWA ) MDH 17
1022 NACK to interrogation MDH 18
1023 End of continuous interrogation, ACK message MDH 19
  Reply to poll command ( only in multi-point systems, SINAUT 8-FW DPDM ) MDH 20

 

Housekeeping records in control direction :

 

Mess. no.    
512 Test command CDH 01
513 MSC quittance, request message repeate CDH 02
514 Start-up acknowledgement command CDH 03
519 Reset command CDH 04
520 Single interrogation command CDH 05
521 Group interrogation command ( e.g General Interrogation ) CDH 06
522 Continuous interrogation command ( counter terminated ) CDH 07
523 Continuous interrogation ON-command ( not terminated ) CDH 08
524 Continuous interrogation OFF-command CDH 09
525 Switch ON-command for timed lists CDH 10
526 Switch OFF-command for timed lists CDH 11
530 Receiver ( monitoring channel ) enable/ disable CDH 12
531 Station enable/ disable CDH 13
768 Threshold operation for measured values CDH 14
769 Smoothing factor operation for measured values CDH 15
770 Synchronisation of the precision time ( Stell 1 ) CDH 16
770 Minutes setting ( Stell 2 ) CDH 17
770 Date/ time setting ( Stell 3 ) CDH 18
771 Measured value selection ( enable/ disable MV addresses ) CDH 19
772 Start-up interrogation ( 1st start or restart ) CDH 20
773 Remote parameter setting CDH 21
779 Interposing test command CDH 22
780 Memory interrogation command, 4 or 6 bytes CDH 23
781 Error bit pattern interrogation CDH 24
790 Threshold operation ( project specific for SINAUT 8-FW 512 ) CDH 25
791 Threshold operation ( project specific for SINAUT 8-FW 512 ) CDH 26
792 Threshold operation ( project specific for SINAUT 8-FW 512 ) CDH 27
793 Threshold selection ( project specific for SINAUT 8-FW 512 ) CDH 28
794 Threshold selection ( project specific for SINAUT 8-FW 512 ) CDH 29
795 Threshold selection ( project specific for SINAUT 8-FW 512 ) CDH 30
796 Threshold selection ( project specific for SINAUT 8-FW 512 ) CDH 31
  Polling command ( only in multi-point systems, SINAUT 8-FW DPDM ) CDH 32

 


MAYR Software

Wuerzburger Ring 39,  D 91056 Erlangen

Manual LIAN 98


LIAN 98 Protocol Router, Simulator and Analyzer
© Copyright 2001, 2006, 2011 by Werner Mayr. All Rights reserved.