34
SI-INTERBUS User Guide
Issue Number: 1
Table 8-3 Eight cyclic words with CT Single Word non-cyclic data mapping
8.1.2
CT Single Word protocol
The CT Single Word protocol uses the lower 16 bits of the non-cyclic channel if data
compression is disabled, and all 16 bits if data compression is enabled.
All parameter values are written as signed 32-bit data values. Decimal point information
is inserted automatically when the data value is written to the drive, and removed when
the data value is read.
Hence, the number of decimal places of the target parameter must be known.
Writing a value of 1234 to a parameter with 2 decimal places will produce a value of
12.34 in the target parameter. Similarly, reading a value of 12.34 will return a 32-bit
integer value of 1234.
The CT Single Word format is shown in
CT Single Word bit significance
Table 8-4 CT Single Word bit significance
The following table (
) shows the CT Single Word
format in more detail.
Mapping
Parameter
Before format change
(Pr 17.005 = 6)
After format change
(Pr 17.005 = 108)
Value
Mapping
Value
Mapping
Pr
17.010
1040
Pr
10.40
,
Status Word
6150
Pr
61.50
,
CT Single Word
non-cyclic mode 1
Pr
17.011
201
Pr
2.01
,
Post Ramp
Reference
1040
Pr
10.40
,
Status Word
Pr
17.012
0
User Defined
201
Pr
2.01
,
Post Ramp
Reference
Pr
17.013
0
Not available
0
User Defined
Pr
17.014
to
Pr
17.019
0
Not available
0
Not available
Pr
17.020
642
Pr
6.42
,
Control Word
6150
Pr
61.50
,
CT Single Word
non-cyclic mode 1
Pr
17.021
121
Pr
1.21
,
Preset Reference 1
642
Pr
6.42
,
Control Word
Pr
17.022
0
User Defined
121
Pr
1.21
,
Preset Reference 1
Pr
17.023
0
Not available
0
User Defined
Pr
17.024
to
Pr
17.029
0
Not available
0
Not available
b15
b14
b13
b12
b11
b10
b9
b8
READ
ERR
Reserved
32-BIT
Stamp Number
b7
b6
b5
b4
b3
b2
b1
b0
Data Byte
