18
Item Names (S7 Item Syntax)
The Siemens 3964R I/O Server supports the S7 item/point names that will be translated
internal into S5 item/point names. This means not all S7 items/points can be used by
this server. The tables below list the item/point names supported by the server:
Data Blocks
Data Format
Items
Suffix
Tag
Type
Range
Bit D<B>
x
,X
m.b
Discrete
0 or 1
String D<B>
x
,S
m,z
Message
2 to 128
D<B>
x
,STRING
m,z
Message
2 to 128
Byte D<B>
x
,B
m
Integer
0 to 255
D<B>
x
,BYTE
m
Integer
0 to 255
Char D<B>
x
,CHAR
m
Integer
-128 to 127
Word D<B>
x
,W
n
Integer
0 to 65535
D<B>
x
,WORD
n
Integer
0 to 65535
KT
Message
0.0 to 999.3
Integer D<B>
x
,INT
n
Integer
-32768 to 32767
BCD
Integer
-999 to 999
Double Word
D<B>
x
,D
k
Integer
0 to 2147483647
D<B>
x
,DWORD
k
Integer
0 to 2147483647
Double
Integer
D<B>
x
,DINT
k
Integer -2147483648
to
2147483647
BCD
Integer
-2147483648
to
2147483647
Real D<B>
x
,REAL
k
Real
+-3.4e38
Note
All data blocks are Read/Write (
x
=3 to 255,
m
= 0 to 255,
b
=0 to 7,
n
= 0 to 254,
k
=252,
z
=length of character string,
n
and
k
must be even). The string must contain an
even number of characters, e.g., 2, 4, 100, 128, etc.
