OPERATION
4
17
MFC 400
www.krohne.com
12/2017 - 4006097501 - AD MFC 400 Profinet R01 en
4.5 Interface description
The device has a static slot/subslot configuration that is shown in the following table.
4.6 Data types and byte order
The data transmitted over the PROFINET IO interface is classified by several data types
(according to IEC 61158-5) described in the following subsections.
4.6.1 Float32
Float32 is also known as REAL in PLC language (IEC 61131-3).
S = Sign, E = Exponent, M = Mantissa
For more details refer to the standard IEEE 754 for single precision floating point format.
4.6.2 Unsigned8
Unsigned8 is also known as USINT or BYTE in PLC language (IEC 61131-3). Data of this type may
to be interpreted as an unsigned integer (USINT) or bit-wise (BYTE) depending on context.
4.6.3 Unsigned16
Unsigned16 is also known as UINT or WORD in PLC language (IEC 61131-3). Data of this type
may to be interpreted as an unsigned integer (UINT) or bit-wise (WORD) depending on context.
Slot
Subslot
Name
Ident No.
Description
0
Device Access Point
0x1
Standard PROFINET IO DAP with up to 2 ports.
32768
Interface
0xa
32769
Port 1
0xb
32770
Port 2
0xc
1
Sensors
0x2
Module representing the sensor system.
1
Sensor Data
0x2
I/O data, start-up records
Table 4-6: Static PROFINET IO slot/subslot mapping
Byte order on bus
0
1
2
3
IEEE 754 bits
SEEE EEEE
EMMM MMMM
MMMM MMMM
MMMM MMMM
Example
Value = 1234.567
0x44
0x9A
0x52
0x25
Table 4-7: Data type Float32
Byte order on bus
0
1
Significance
MSB
LSB
Example
Value = 1234
0x04
0xD2
Table 4-8: Data type Unsigned16
