Siemens SIMATIC S5 Manual page 90

Introduction to STEP 5
Table 2-4. Block Parameter Types and Data Types with Permissible Actual Operands
Parameter Data Type
Type
I, Q BI
BY
W
D KM
KY
KH
KS
KT
KC
KF
B Type designation not permitted
T Type designation not permitted
C Type designation not permitted
2-16
for an operand with bit address
for an operand with byte address
for an operand with word address
for a binary pattern (16 digits)
for two absolute numbers, one byte
each, each in the range from 0 to 255
for a hexadecimal pattern (maximum
4 digits)
for a character (maximum 2
alphanumeric characters)
for a time (BCD-coded time) with time
base 1.0 to 999.3
for a count (BCD-coded) 0 to 999
for a fixed-point number in the range
from -32768 to +32767
Permissible Actual Operands
I x.y inputs
Q x.y outputs
F x.y flags
IB x input bytes
QB x output bytes
FB x flag bytes
DL x data bytes left
DR x data bytes right
PB x peripheral bytes
IW x input words
QW x output words
FW x flag words
DW x data words
PW x peripheral words
Constants
DB x Data blocks. The C DBx operation is
executed.
FB x Function blocks (permissible without
parameters only) are called
unconditionally (JU..x).
PB x Program blocks are called
unconditionally (JU..x).
SB x Sequence blocks are called
unconditionally (JU..x).
T Timer. The time should be assigned
parameters as data or be
programmed as a constant in the
function block.
Z Counter. The count should be
assigned parameters as data or be
programmed as a constant in the
function block.
EWA 4NEB 811 6149-02
S5-115F Manual