Parker Compax3 C3I20T11, Руководство по эксплуатации

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Parker EME
Communication
192-120103 N13 C3I20T11 / C3I32T11 December 2010
349
Data formats of the bus objects
In this chapter you can read about:
Integer formats .............................................................................................................. 349
Unsigned - Formats ....................................................................................................... 349
Fixed point format E2_6 ................................................................................................. 349
Fixed point format C4_3 ................................................................................................ 350
Bus format Y2 and Y4 .................................................................................................... 350
Bit sequence V2 ............................................................................................................ 351
Byte string OS ............................................................................................................... 351
Integer formats
Twos complement representation;
The highest order bit (MSB) is the bit after the sign bit (VZ) in the first byte.
VZ == 0: positive numbers and zero; VZ == 1: negative numbers
Type
Bit 8 7 6 5 4 3 2 1
Integer 8
length: 1 Byte
VZ 2
6
2
5
2
4
2
3
2
2
2
1
2
0
Integer 16
MSB VZ 2
14
2
13
2
12
2
11
2
10
2
9
2
8
Length: 1 Word LSB 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
Integer 32
MSB VZ 2
30
2
29
2
28
2
27
2
26
2
25
2
24
Length: 2 Words 2
23
2
22
2
21
2
20
2
19
2
18
2
17
2
16
2
15
2
14
2
13
2
12
2
11
2
10
2
9
2
8
LSB 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
Unsigned - Formats
Type Bit 8 7 6 5 4 3 2 1
Unsigned 8
Length: 1 Byte
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
Unsigned 16
MSB 2
15
2
14
2
13
2
12
2
11
2
10
2
9
2
8
Length: 1 Word LSB 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
Unsigned 32
MSB 2
31
2
30
2
29
2
28
2
27
2
26
2
25
2
24
Length: 2 Words 2
23
2
22
2
21
2
20
2
19
2
18
2
17
2
16
2
15
2
14
2
13
2
12
2
11
2
10
2
9
2
8
LSB 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
Fixed point format E2_6
Linear fixed point value with six binary places after the decimal point. 0
corresponds to 0, 256 corresponds to 2
14 (0x4000).
Twos complement representation;
MSB is the bit after the sign bit
VZ == 0: positive numbers and zero;
VZ == 1: negative numbers
Type Bit 8 7 6 5 4 3 2 1
E2_6
MSB VZ 2
8
2
7
2
6
2
5
2
4
2
3
2
2
Length: 1 Word LSB 2
1
2
0
2
-1
2
-2
2
-3
2
-4
2
-5
2
-6