User guide

VEGACOM 557 Profibus DP 35
Data image in VEGACOM 557
Measured value image DISBUS in mode 6E6A
In this operating mode, it is possible to read out the PC/DCS values individually in VEGACOM
557, i.e. the Profibus-Master enquires a measured value and this measured value is provided
by the VEGACOM 557.
Control command 0xCD (DISBUS)
When enquiring with this control command, VEGACOM 557 answers with individual PC/DCS
value. The enquiry telegram written by the Profibus-Master into the 6 Byte outputs is struc-
tured as follows.
Byte1 Byte2 Byte3 Byte4 Byte5 Byte6
6 Byte
Format of the enquiry acc. to individual PC/DCS values
VEGACOM 557 writes the following answering telegram into the 6 Byte inputs of the Profibus-
Master:
6 Byte
Byte1 Byte2 Byte3 Byte4 Byte5 Byte6
Format of the VEGACOM 557 answer
Status:
0x00 = valid measured value
0x01 = simulated measured value (only on
VEGAMET 509 and 512)
0x80 = old measured value (probably con-
nection separated)
0xFE = no PC/DCS value available (not
configurated)
0xFF = general error
PC/DCS measured values
0xHH = High-Byte of the measured value
0xLL = Low-Byte of the measured value
Value range comprises max. +32.768 to
-32.767.