Data type

KNX value

EIS type

SIMATIC data type

Representation in the SIMATIC

User conversion

DPT1

BOOL

EIS1

Bit

TRUE/FALSE

n

DPT2

1 bit controlled

EIS8

Byte

MSB ([0000 00XY) LSB

X = controlled

Y = Value

n

DPT3

4 bits

EIS2

Byte

MSB (0000 XYYY) LSB

X = Increase/decrease

Y = Step 0-7

n

DPT4

Char

EIS13

Char

ASCII

n

DPT5

1 byte unsigned

EIS14

Byte

n

DPT6

1 byte signed

EIS14

Byte

y

DPT7

2 bytes unsigned

EIS10

Word

n

DPT8

2 bytes signed

EIS10

Int

Representation in 2s complement

n

DPT9

2 bytes float

EIS5

Real

Conversion implicit in the driver

n

DPT10

Time of Day

EIS3

DWord

MSB (0000 0000/dddh hhhh/00mm mmmm/00ss ssss) LSB

d = day 0 no day; 1-7

h = hour 0-23

m = minute 0-59

s = second 0-59

Important! No value check by the driver

n

DPT11

Date

EIS4

DWord

MSB (0000 0000/000d dddd/0000 mmmm/0yyy yyyy) LSB

d = day 0-31

m = month 0-12

y = year 0-99 (0-89 = 2000-2089; 90-99 = 1990-1999)

Important! No value check by the driver

n

DPT12

4 bytes unsigned

EIS11

DWord

n

DPT13

4 bytes signed

EIS11

D Int

Representation in 2s complement

n

DPT14

Float

EIS9

Real

IEEE754

n

DPT15

Access

EIS12

DWord

MSB (XXXX6 XXXX5/XXXX4 XXXX3/XXXX2 XXXX1/EPDC NNNN) LSB

X = AccessCode 6-digit; 0-9; 1 nibble each

E = 1 detection error (reading of access information code was not successful)

P = Permission 0=not accepted; 1= accepted

D = Direction 0=left to

n

DPT16

String

EIS15

String (14)

Driver evaluates header of the S7 string and then generates the 14-character long EIB string.

n