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100

101

SIMATIC Instructions

9-2

S7-200 Programmable Controller System Manual

C79000-G7076-C233-01

9.1 SIMATIC Bit Logic Instructions

Standard Contacts

These instructions obtain the referenced value from the

memory or process-image register if the data type is I or

Q. You can use a maximum of seven inputs to both the

AND and the OR boxes.

The Normally Open contact is closed (on) when the bit

is equal to 1.

The Normally Closed contact is closed (on) when the bit

is equal to 0.

In LAD, normally open and normally closed instructions

are represented by contacts.

In FBD, normally open instructions are represented by

AND/OR boxes. These instructions can be used to

manipulate Boolean signals in the same manner as

ladder contacts. Normally closed instructions are also

represented by boxes. A normally closed instruction is

constructed by placing the negation symbol on the stem

of the input signal.

In STL, the Normally Open contact is represented by the

Load, And, and Or instructions. These instructions

Load, AND, or OR the bit value of the address bit to the

top of the stack.

In STL, the Normally closed contact is represented by

the Load Not, And Not, and Or Not instructions. These

instructions Load, AND, or OR the logical Not of the bit

value of the address bit to the top of the stack.

Inputs/Outputs Operands Data Types

bit (LAD, STL) I, Q, M, SM, T, C, V, S, L BOOL

Input (FBD) I, Q, M, SM, T, C, V, S, L, Power Flow BOOL

Output (FBD) I, Q, M, SM, T, C, V, S, L, Power Flow BOOL

LD bit

A bit

O bit

LDN bit

AN bit

ON bit

bit

AND

222 224

333

221

1 2 ... 173 174 175 176 177 178 179 180 181 182 183 ... 503 504

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