Delphin ProfiMessage, Hardware Manual

Page: 167 / 322

Profi Message
These settings are dependent on the Function code inputs and also on whether the
channel is an input or output.
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. Start position in payload data , Scaling and Use channel as
output are also set according to the 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 St art 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.
l
Byte pattern (input channels only)
To display the different byte and word order combinations, a hex value (a ran-
dom number in the example) is shown with the resulting byte pattern of a
message.
Scaling
If a Modbus user sends values that require conversion, enable Scaling and enter
Min / Max values to convert from the Input value to the Scale value.
If the Use channel as output option is used, scaling takes place in the opposite dir-
ection: Enter the range from the source data in Scale value and the range for the
output signal in Output value .
167
Delphin Technology AG
Dezember 2015
Profi Message Manual