Conventions Used To Describe The Instructions - Siemens Simatic S7-200 System Manual

Conventions Used to Describe the Instructions

Figure 6-1 shows a typical description for an instruction and points to the different areas used to describe
the instruction and its operation. The illustration of the instruction shows the format in LAD, FBD, and STL.
The operand table lists the operands for the instruction and shows the valid data types, memory areas
and sizes for each operand.
EN/ENO operands and data types are not shown in the instruction operand table because the operands
are the same for all LAD and FBD instructions.
-
For LAD: EN and ENO are power flow and are BOOL data types.
-
For FBD: EN and ENO are I, Q, V, M, SM, S, T, C, L, or power flow and are BOOL data types.
Description of the instruction
and operands
List of the error conditions
that affect ENO and any SM
bits affected
Operands for the
instruction
Figure 6-1 Instruction Descriptions
Valid data types
Valid memory areas and sizes for
the operands
S7-200 Instruction Set
STL instruction LAD and FBD instructions
Chapter 6
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