PLC data types and addressing

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1. 7. Data Types and Addressing

7.1 Data Types

6. Data Types Summary

Each elementary data type has a defined length. The following table lists the elementary
data types.

Summary



Type and
Description
Size
in
Bits
Format
Options
Range and Number
Notation (lowest to
highest value)_
Example
BOOL(Bit) 1 Boolean text TRUE/FALSE TRUE
BYTE
(Byte)
8 Hexadecimal

Binary
B#16#0 to B#16#FF

2#0 to 2#1111_1111
L B#16#10
L byte#16#10
L2#1011_1010
WORD
(Word)
16 Binary
number
Hexadecimal
number
BCD
Decimal
number
unsigned
2#0 to
2#1111_1111_1111_1111
W#16#0 to W#16#FFFF
C#0 to C#999
B#(0.0) to B#(255.255)
L 2#0001_0000_0000_0000
L W#16#1000
L word#16#1000
L C#998
L B#(10,20)
L byte#(10,20)
DWORD
(Double
word)
32 Binary
number
Hexadecimal
2#0 to
2#1111_1111_1111_1111
2#1000_0001_0001_1000_
1011_1011_0111_1111

7. number
Decimal
number
unsigned
1111_1111_1111_1111
DW#16#0000_0000 to
DW#16#FFFF_FFFF
B#(0,0,0,0) to
B#(255,255,255,255)
L DW#16#00A2_1234
L dword#16#00A2_1234
L B#(1, 14, 100, 120)
L byte#(1,14,100,120)
INT
(Integer)
16 Decimal
number
signed
-32768 to 32767 L 1
DINT
(Integer, 32
bits)
32 Decimal
number
signed
L#-2147483648 to
L#2147483647
L L#1
REAL
(Floating-
point
number)
32 IEEE
Floating-
point
number
Upper limit:
3.402823e+38
Lower limit: 1.175 495e-
38
L 1.234567e+13
S5TIME
(SIMATIC
time)
16 S7 time in
steps of
10 ms
(default)
S5T#0H_0M_0S_10MS to
S5T#2H_46M_30S_0MS
and
S5T#0H_0M_0S_0MS
L S5T#0H_1M_0S_0MS
L
S5TIME#0H_1H_1M_0S_
0MS
TIME
(IEC time)
32 IEC time in
steps of 1
ms, integer
signed
-
T#24D_20H_31M_23S_6
48MS to
T#24D_20H_31M_23S_6
47MS
L T#0D_1H_1M_0S_0MS
L
TIME#0D_1H_1M_0S_0M
S
DATE
(IEC date)
16 IEC date in
steps of 1
day
D#1990-1-1 to
D#2168-12-31
L D#1996-3-15
L DATE#1996-3-15
TIME_OF_D
AY (Time)
32 Time in
steps of 1 ms
TOD#0:0:0.0 to
TOD#23:59:59.999
L TOD#1:10:3.3
L
TIME_OF_DAY#1:10:3.3
CHAR
(Character)
8 ASCII
characters
'A','B' etc. L 'E'

8. 7.2 Addressing
Storage areas are Inputs, Outputs, Timers, Counters, Memory (Local Variables,
Global Variables) , Data Blocks Pointers.

- Inputs
I(x, y) ---------------------- x = Byte address, y = Bit address
Bytes 0, 1, 2, ..., 255 Bits 0, 1, 2, …, 7

IBx (Input Byte) ---------- Ex.: IB0 = I0.0, I0.1, …,I0.7

IWx (Input Word) -------- Ex.: IW0 = (IB0, IB1)
= (I0.0, I0.1, …,I0.7, I1.0, I1.1,…, I1.7)

IDx (Input DWord) ------ Ex.: ID0 = (IW0, IW2) = (IB0, IB1, IB2, IB3)
= (I0.0, I0.1,…,I0.7, I1.0, I1.1,…,I1.7, I2.0, I2.1, I2.7, I3.0, I3.1, I3.7)
___________________________________________
- Outputs
Q(x, y) ---------------------- x = Byte address, y = Bit address
Bytes 0, 1, 2, ..., 255 Bits 0, 1, 2, …, 7

QBx (Output Byte) ---------- Ex.: QB0 = Q0.0, Q0.1, …,Q0.7

QWx (Output Word) -------- Ex.: QW0 = (QB0, QB1)
= (Q0.0, Q0.1, …,Q0.7, Q1.0, Q1.1,…, Q1.7)

QDx (Output DWord) ------ Ex.: QD0 = (QW0, QW2) = (QB0, QB1, QB2, QB3)
=(Q0.0, Q0.1,…,Q0.7, Q1.0, Q1.1,…,Q1.7, Q2.0, Q2.1, Q2.7, Q3.0, Q3.1, Q3.7)
_____________________________________
- Memory (M = Markers or Global Memory, L = Local Memory)
M(x, y) ---------------------- x = Byte address, y = Bit address
Bytes 0, 1, 2, ..., 255 Bits 0, 1, 2, …, 7

MBx (Memory Byte) ---------- Ex.: MB0 = M0.0, M0.1, …,M0.7
MWx (Memory Word) -------- Ex.: MW0 = (MB0, MB1)
= (M0.0, M0.1, …,M0.7, M1.0, M1.1,…, M1.7)

MDx (Memory DWord) ----- Ex.: MD0 = (MW0, MW2)= (MB0, MB1, MB2, MB3)
=(M0.0, M0.1,…,M0.7, M1.0, M1.1,…,M1.7, M2.0, M2.1, M2.7, M3.0, M3.1, M3.7)

9. - Timers
T1, T2, T3, …, Tn (According to the available number of timers)
_____________________________________
- Counters
C1, C2, C3,…, Cn (According to the available number of counters)
_____________________________________

- Data Blocks