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Statement List (STL) - DCE FEL ČVUT v Praze

Statement List (STL) - DCE FEL ČVUT v Praze

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Accumulator Instructions<br />

14.13 BLD Program Display Instruction (Null)<br />

Format<br />

Description<br />

Status word<br />

BLD <br />

Address Description<br />

Number specifies BLD instruction, range from 0 to 255<br />

BLD (program display instruction; null instruction) executes no function<br />

and does not affect the status bits. The instruction is used for the programming<br />

device (PG) for graphic display. It is created automatically when a Ladder or FBD<br />

program is displayed in <strong>STL</strong>. The address specifies the BLD instruction<br />

and is generated by the programming device.<br />

BR CC 1 CC 0 OV OS OR STA RLO /FC<br />

writes: - - - - - - - - -<br />

14.14 NOP 0 Null Instruction<br />

Format<br />

Description<br />

Status word<br />

NOP 0<br />

NOP 0 (Instruction NOP with address "0") executes no function and does not affect<br />

the status bits. The instruction code contains a bit pattern with 16 zeros. The<br />

instruction is of interest only to the programming device (PG) when a program is<br />

displayed.<br />

BR CC 1 CC 0 OV OS OR STA RLO /FC<br />

writes: - - - - - - - - -<br />

<strong>Statement</strong> <strong>List</strong> (<strong>STL</strong>) for S7-300 and S7-400 Programming<br />

14-12 A5E00706960-01

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