
Special memory (SM) and system symbol names
D.3 SMB1: Instruction execution status
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
803
D.3
SMB1: Instruction execution status
Special memory byte 1 (SM1.0 - SM1.7) provides execution status for various instructions,
such as table and math operations. These bits are set and reset by instructions at execution
time.
Table D- 2 SMB1 instruction execution status bits
S7-200 SMART
symbol name
SM address
Description
Result_0
SM1.0
Certain instructions set this bit to TRUE when the result of the operation is zero.
Overflow_Illegal
SM1.1
Certain instructions set this bit to TRUE when either an overflow results or when
the instruction detects an illegal number value.
Neg_Result
SM1.2
Math operations set this bit TRUE when the operation produces a negative result.
Divide_By_0
SM1.3
The CPU sets this bit TRUE when the program attempts a division by zero.
Table_Overflow
SM1.4
The Add to Table (ATT) instruction sets this bit TRUE when the referenced data
table is full.
Table_Empty
SM1.5
The CPU sets this bit TRUE when either LIFO or FIFO instructions attempt to read
from an empty table.
Not_BCD
SM1.6
The CPU sets this bit TRUE for an illegal value (non-BCD) in a BCD to binary con-
version.
Not_Hex
SM1.7
The CPU sets this bit TRUE for an illegal value (non-hex ASCII digit) during ASCII
to Hex (ATH) conversion.
Содержание SIMATIC S7-200
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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 ...