LIAN 98(en) : Protocol Siemens SINAUT ST7, 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 ST7 :

Telegram format with fixed length

The telegram with fixed length is normally provided for the services of the link layer. In special cases this format with fixed length is also used as acknowledge instead of a single character.

Polling command SINAUT ST1 / ST7 :

Long achnowledge SINAUT ST1 / ST7 :

Single character

The single character is normally used in order to acknowledge service data of the link layer and user data.

Short acknowledge SINAUT ST1 / ST7 :

E5H = A C K from SS : Positive acknowledge from the substation to the master ( monitoring direction )
A2H = A C K from master : Positive acknowledge from the master to the substation ( control direction )

F1 field :

TZ	Telegram counter ( 0... 7 ) TZ = 0 : Start up identifier TZ = 1... 7 : 1st to 7th telegram
KC	Control code polling mode : in reply message : 0 = nth message 1 =last message in polling message : 0 = normal message 1 = 1st message after system start up in spontaneous and cyclic mode ( acknowledged ) : 0 = nth message 1 = 1st message after system start up
FA	Function selection 0 = processing on TIM 1 = processing in the CPU
AE	Address extension 0 = ST1 Telegram without address extension 1 = ST1 Telegram with address extension 2 = ST7 Telegram
RB	Direction bit : physical transmission direction ( direction ) RB = 0 : Data from the substation to the master ( monitoring direction ) RB = 1 : Data from the master to the substation ( control direction )

F2 field :

US	Message from substation
res	reserved
X	Telegram without memory function
PACK	Package grid for ST1 telegrams with AE = 1
S7	S7 telegram S7 = 0 : ST7 telegram S7 = 1 : S7 telegram

F3 field :

TA	Telegram type TA = 0 : organizational telegram TA = 1 : requested organizational telegram TA = 2 : process telegram TA = 3 : requested process telegram
S	Data object locked
Z	Telegram with time stamp
P	Permanent transmission
U	Unconditional spontaneous transmission
B	Conditional spontaneous transmission
PR	Image memory method of TIM PR = 0 : Image memory method PR = 1 : Transmit buffer method

F4 field :

DV	Data loss
DS	Data transmission locked
res	reserved
SEG	Telegram segmentation SEG = 0 : no segmentation SEG = 1 : 1st segment SEG = 2 : 2nd till next last segment SEG = 3 : Last segment

Time status bits :

2 ⁰ ( UZG )	Time valid UZG = 0 : time is not valid UZG = 1 : time is valid
2 ¹ ( SOZ )	Summer time SOZ = 0 : winter time ( normal time ) SOZ = 1 : Summer time
2 ²	reserved
2 ³ ( AKB )	Announcement bit, only set in time synchronization telegrams AKB = 0 : not significant AKB = 1 : announcement for summer-/ winter time switch

Information type identification ( TypeID ) :

The TypeID is unfortunately not recognizable out of the ST7 telegram. In the process system it is defined by the subscriber- and the object number. In LIAN 98 an unambiguously TypeID is defined for each data type in order to display the information ( message, measurand ... ) in an easily readable plaintext and not only hexadecimal. Organizational telegrams are not affected.

Via the <parameter list> the correct TypeID can be assigned to the objects of the particular subsribers. The TypeID value ZERO is not used.

Process information in monitoring direction

TypeID
1	ST7 : 4 byte information each 8 bit binary.	BIN_04B
2	ST7 : 2 analogous values, each 16 bit integer.	ANA_02W
3	ST7 : 4 analogous values, each 16 bit integer.	ANA_04W
4	ST7 : 1 counter value, 32 bit ST1 format.	CNT_01D
5	ST7 : 4 counter value, 32 bit ST1 format.	CNT_04D
...
7	ST1 : 1 byte information, each 8 bit binary.	MT__01B
8	ST1 : 2 byte information, each 8 bit binary	MT__02B
9	ST1 : 4 byte information, each 8 bit binary	MT__04B
10	ST1 : 1 analogous values, 16 bit ST1 format.	AT__01W
11	ST1 : 4 analogous values, 16 bit ST1 format.	AT__04W
12	ST1 : 8 analogous values, 16 bit ST1 format.	AT__08W
13	ST1 : 1 counter value, 32 bit ST1 format.	ZT__01D
14	ST1 : 2 counter value, 32 bit ST1 format.	ZT__02D
15	ST1 : 4 counter value, 32 bit ST1 format.	ZT__04D
...

Process information control direction :

TypeID
17	ST7 : 1 byte command, 16 bit ( 1 of 8 ) ST1 format.	CMD_01B
18	ST7 : 1 setpoint, 16 bit analogous format ST7.	SET_01W
19	ST7 : Parameter object, max. 12 DWORD.	PAR_12D
20	ST7 : Data object, max. 12 DWORD.	DAT_12D
...
22	ST1 : 1 byte command, 16 bit ( 1 of 8 ) ST1 format.	BT__01B
23	ST1 : 1 setpoint ( type 0 ), 16 bit analogous format ST1 ( left sided ).	ST__01W_0
24	ST1 : 1 setpoint ( type 1 ), 16 bit analogous format ST1 ( right sided ).	ST__01W_1
25	ST1 : 1 setpoint ( type 2 ), 16 bit binary ( bit pattern )	ST__01W_2
26	ST1 : 1 setpoint ( type 3 ), 16 bit analogous, integer format.	ST__01W_3
27	ST1 : Data, max. 26 WORD.	DT__26W
...

Organizational ST7 Telegrams :

Index
0	ST7 : General interrogation
2	ST7 : Impulse indication
4, 6	ST7 : Connection indications
8	ST7 : State-indication
...
256	ST7 : Time synchronization
258	ST7 : accounting data, state of line
260	ST7 : accounting data, state of line acknowledge
262	ST7 : accounting data, state of line request

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Manual LIAN 98