VEGA VEGACOM 557 Profibus DP - Manual (Page 29)

VEGACOM 557 Profibus DP 29
Data image in VEGACOM 557
Enquiry of measured value from the DP Master with control command 0xCC to DISBUS
In the 2 Byte output section of the VEGACOM 557 DP-Gateway , the DP Master enquir es with
the control command 0xCC and a block no. 1 … 32, one block with eight measured values
each fr om the DP-Gateway .
DP-Master: Control command: 0xCC
Block no.: 0x01...0x20
2 Byte
output section
Byte 1 Byte 2
control
command Block no.
0xCC
0x01
...0x20
Enquiry of measured value from Profibus-Master
8 PC/DCS values
Control word PC/DCS value no. 1 of VEGAMET no.1 PC/DCS value no. 2...7
Byte1 Byte2 Byte3 Byte4 Byte5 Byte6 Byte7 Byte8 Byte9 Byte10 Byte50
...
Control Block no. Index Status High-HI High-LO Low-HI Low-LO Index Status Low_LO
...
0xCC 0x02 0x11 0x00 0x00 0x00 0xXX 0xXX 0x12 0x00 0xXX
...
Image of measured value on Profibus DP with control command 0xCC on DISBUS
VEGACOM 557 answers with the block no. (0 … 31) decremented by the value 1
Answer of VEGACOM 557 to the enquiry of measured value from the Profibus-Master (here enquired block
no. = 3)
Index byte
PC/DCS
number
VEGAMET
address
BIT 4...7 BIT 0...3
1...15 1...7
Example:
If the enquired measured value is the PC/DCS value no. 3
of VEGAMET no. 2, the value 0x23 (hex) is delivered in the
index byte.
Note:
The index delivered via the DISBUS on enquiry of measured value, is structured as follows:
Structure of the index byte on enquiry of measured value via DISBUS
Example:
Enquiry telegram to VEGACOM 557 (2 Byte):
0xCC 0x03 Block no. 3 is enquired
Answering telegram of VEGACOM 557 (50Byte):
0xCC 0x02 0x11 0xYY 0x00 0x00 0xHH 0xLL 0x12 0xYY 0x00 0x00 0xHH ...
control word PC/DCS value no. 1, VEGAMET no. 1 PC/DCS value-no. 2, VEGAMET no. 1
0xYY = Index-Byte
0xHH = High-Byte measured value
0xLL = Low-Byte measured value