Delphin ProfiMessage, Hardware Manual

Page: 181 / 322

Profi Message
When configuring the Profibus master, it receives information on the
number of I/O channels from its slave, and hence also from the
PROFIBUS slave. At run time, i.e. when data exchange is taking place,
the master sends the I/O configuration to the slave. If the configured
byte offset in the
Delphin device is greater than the I/O addresses of
the transmitted master configuration, the Delphin device shows a
configuration error in the channel status.
l
Bit offset
This field is available only for the bit data type and binary encoding. The pay-
load bit in this data type can be between the 0 and seventh byte position.
Byte offset is also available for this data type. Input is restricted to the valid
values, and the default is 0
Data type settings
l
Data type
Specifies the data type for interpreting the transmitted payload data. Bit
length, Byte order and Word order are set and adjusted in relation to the
adopted setting. The Start position in data and Scaling are set according to
data type.
l
Signed
Sets whether the integer data type is to be interpreted as signed or
unsigned. An 8-bit value would then be in the range -128 to 127 (two’s com-
plement) or 0 to 255. Floating values are always interpreted as signed. Bit-
values make no distinction between signed and unsigned.
l
Bit length
Sets the bit lengths for integer and floating data types. Byte sequence and
Word sequence are adjusted according to length value. This also applies to
the numeric fields in the
Start position in data.
l
Encoding type
Displays the encoding type used for interpreting the transmitted payload
data.
l
Byte sequence
The byte order (byte sequence) is a number, made up of several bytes, that
sets how bytes are ordered for the address. BigEndian, also known as
Motorola format, orders the most significant byte to the lowest address.
LittleEndian, also known as Intel format, orders the least significant byte to
the lowest address. Refer also to
http://en.wikipedia.org/wiki/Endianness.
l
Word order
Like the byte order, word order orders word data (1 word = 2 bytes = 16
bits) to addresses. In addition to determining byte order, a different word
ordering may be necessary.
181
Delphin Technology AG
Dezember 2015
Profi Message Manual