Simatic Bit Logic Instructions; Standard Contacts - Siemens SIMATIC S7-200 System Manual

SIMATIC Instructions
9.1

SIMATIC Bit Logic Instructions

Standard Contacts

L
A
D
F
B
D
S
LD
T
A
L
O
LDN
AN
ON
221 222
Inputs/Outputs
bit (LAD, STL) I, Q, M, SM, T, C, V, S, L
Inputs (FBD) I, Q, M, SM, T, C, V, S, L, Power Flow
Output (FBD) I, Q, M, SM, T, C, V, S, L, Power Flow
9-2
These instructions obtain the referenced value from the
bit
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.
bit
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.
AND
In LAD, normally open and normally closed instructions
are represented by contacts.
OR
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
bit
bit constructed by placing the negation symbol on the stem
bit
of the input signal. Inputs to both the AND and OR boxes
can be expanded to a maximum of seven inputs.
bit
bit
In STL, the Normally Open contact is represented by the
bit
Load, And, and Or instructions. These instructions
Load, AND, or OR the bit value of the address bit to the
top of the stack.
224 226
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.
Operands
S7-200 Programmable Controller System Manual
Data Types
BOOL
BOOL
BOOL
A5E00066097-02