Concepts And Conventions For Step 7-Micro/Win 32 Programming; Add Integer And Subtract Integer; Simatic Instructions - Siemens SIMATIC S7-200 System Manual

Conventions for S7-200 Instructions
8.1 Concepts and Conventions For STEP 7-Micro/WIN 32
Programming
The following diagram shows the STEP 7-Micro/WIN 32 instruction format as used
throughout this chapter. A description of the components of the instruction format
follows the diagram.

Add Integer and Subtract Integer

L
A
EN
D
F
IN1
B
D
IN2
EN
IN1
IN2
S
+I
T
L
-I
221 222
Inputs/Outputs
IN1, IN2 VW, IW, QW, MW, SW, SMW, LW, AIW, T, C, AC, Constant, *VD,
*AC, *LD
OUT VW, IW, QW, MW, SW, SMW, LW, T, C, AC, *VD, *AC, *LD
Title of the Instruction or Instruction Group: In this example Add Integer
Subtract Integer is the title.
Figure Showing the STEP 7-Micro/WIN 32 Instruction: The figure below the
instruction title contains a picture of the LAD instruction element, the FBD
instruction element and for SIMATIC instructions, the STL instruction mnemonics
and operands. In some cases, the picture of the LAD and FBD instructions are the
same, and only one box containing both the LAD and FBD picture is shown (this is
the case in this example). The SIMATIC STL instruction mnemonics and operands
always appear in a separate box.
In the example, the LAD/FBD pictures have three inputs (inputs are always on the
left side of the picture) and two outputs (outputs are always on the right side of the
picture). In LAD there are two basic types of inputs and outputs. The first type of
input/output is a power flow input or output.
8-2
The Add Integer and Subtract Integer instructions add
or subtract two 16-bit integers and produce a 16-bit result
ADD_I
ENO
(OUT).
OUT OUT In LAD and FBD:
In STL:
SUB_I
ENO
Error conditions that set ENO = 0: SM1.1 (overflow),
OUT OUT
SM4.3 (run-time), 0006 (indirect address)
These instructions affect the following Special Memory
bits: SM1.0 (zero); SM1.1 (overflow); SM1.2 (negative)
IN1, OUT
IN1, OUT
226
224
Operands
IN1 + IN2 = OUT
IN1 - IN2 = OUT
IN1 + OUT = OUT
OUT - IN1 = OUT
S7-200 Programmable Controller System Manual
Data Types
INT
INT
and
A5E00066097-02