Festo Электромотор MTR-DCI - Manual (Page 267)

B. Supplementary information
B-61
Festo P.BE-MTR-DCI-PB-EN en 1209a
Note
The following applies when writing to the objects:
– Discrete values (values from a value table):
an invalid value will not be accepted; the previously
valid value will be retained.
– Continuous values (e.g. lengths, speeds, etc.): an invalid
value will be limited to the nearest permitted value.
Note
The transfer of values using CI commands via the serial
interface requires conversion into
increments before
transfer can take place. All parameters are always saved in
increments in the controller and are not converted into the
relevant measuring system until they are written or read.
Further information on converting can be found in sec-
tion A.4.
All values are transferred in hexadecimal figures; 1 character
represents 4 bits, and is known as a tetrad . The first te-
trad transferred contains the higher-value bits of the value.
Generally: tetrad contains the bits b
n ...b n+3
Example: UINT8
Dec 26
Hex 1 A
Bin 0 0 0 1 1 0 1 0
b
7
b
6
b
5
b
4
b
3
b
2
b
1
b
0
Tetrad T
4
Tetrad T
0