
Special memory (SM) and system symbol names
D.16 SMB86-SMB94 and SMB186-SMB194: Receive message control
S7-200 SMART
820
System Manual, V2.3, 07/2017, A5E03822230-AF
You use the bits of the message control byte define the criteria for identifying the message.
The message control byte also includes the start of message and end of message criteria.
To determine the start of a message, either of two sets of logically ANDed start-of-message
criteria must be true and must occur in sequence. "In sequence" means one of the following:
●
Start character follows idle line
●
Start character follows break
A logical OR of the end-of-message criteria determines the end of a message. The
equations for start and end criteria are as follows:
Start of message = (il AND sc) OR (bk AND sc)
End of message = ec OR tmr OR maximum character count reached
Содержание SIMATIC S7-200
Страница 30: ...Product overview 1 7 Programming software S7 200 SMART 30 System Manual V2 3 07 2017 A5E03822230 AF ...
Страница 267: ...Program instructions 7 6 Counters S7 200 SMART System Manual V2 3 07 2017 A5E03822230 AF 267 HSC modes 3 and 4 ...
Страница 394: ...Program instructions 7 18 Subroutine S7 200 SMART 394 System Manual V2 3 07 2017 A5E03822230 AF ...
Страница 425: ...Communication 8 5 PROFIBUS S7 200 SMART System Manual V2 3 07 2017 A5E03822230 AF 425 ...
Страница 786: ...Technical specifications A 11 S7 200 SMART cables S7 200 SMART 786 System Manual V2 3 07 2017 A5E03822230 AF ...
Страница 798: ...Error codes C 4 PLC fatal error codes S7 200 SMART 798 System Manual V2 3 07 2017 A5E03822230 AF ...
Страница 848: ...Ordering information F 6 Human Machine Interface devices S7 200 SMART 848 System Manual V2 3 07 2017 A5E03822230 AF ...