Smb1: Instruction Execution Status - Siemens SIMATIC S7 System Manual

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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

SMB1 instruction execution status bits

S7-200 SMART

Overflow_Illegal

Table_Overflow

S7-200 SMART

System Manual, V2.3, 07/2017, A5E03822230-AF

Certain instructions set this bit to TRUE when the result of the operation is zero.

Certain instructions set this bit to TRUE when either an overflow results or when

the instruction detects an illegal number value.

Math operations set this bit TRUE when the operation produces a negative result.

The CPU sets this bit TRUE when the program attempts a division by zero.

The Add to Table (ATT) instruction sets this bit TRUE when the referenced data

table is full.

The CPU sets this bit TRUE when either LIFO or FIFO instructions attempt to read

from an empty table.

The CPU sets this bit TRUE for an illegal value (non-BCD) in a BCD to binary con-

The CPU sets this bit TRUE for an illegal value (non-hex ASCII digit) during ASCII

to Hex (ATH) conversion.

Special memory (SM) and system symbol names

D.3 SMB1: Instruction execution status

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Simatic s7-200 smart