VEGA VEGACOM 557 Profibus DP - Manual (Page 33)

VEGACOM 557 Profibus DP 33
Image of the contact inputs/outputs on the DISBUS in mode 50E2A
Beside the previously described measured values, it is possible to transmit via the VEGA-
COM 557 also switching conditions of the VEGA signal conditioning instruments VEGAMET
513, 514, 515 and series 600.
These are:
- condition of the contact inputs (position of key switch etc.)
- condition of the contact outputs (relay outputs)
In contrast to the image of the measured values, the image of the switching conditions is “Bit
orientated“. One switch condition is represented in the VEGACOM 557 as one Bit, whereby all
available information of a VEGAMET is saved within one data word of 16 Bit
(= 2 Byte). Such a data word with 16 Bit, i.e. max. 15 data words at 16 Bit each, is available for
each VEGAMET on the DISBUS (bus addresses 1...15). The filing of the contact input/outputs
is made in block no. 33 of the VEGACOM 557 memory area. The allocation of the individual
data words is made acc. to the DISBUS addresses.
On the DISBUS a difference is made in the data word between input contacts (EK) and relay
contacts (RK). The input contacts are bit coded in the High-Byte, the relay contact in the Low-
Byte of the data word (see fig. 7.11).
The meaning of the individual Bits is defined
as follows:
Status of the inputs:
0 = all inputs OK
1 = input status not available (no inputs
configured or VEGAMET not available)
Switching conditions of inputs 1 and 2:
0 = input contact is open
1 = input contact is closed
Data word
input contacts (0xEE) output contacts (0xRR)
Byte1 (High-Byte) Byte2 (Low-Byte)
Bit7
res. Status Status
0/1
Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
res. res. res. res. EK2 EK1 res. res. res. res RK3 RK2 RK1
0/1 0/1 0/1 0 0/1 0/1 0/1 0 0 0 0 0 0 0 0
Format of the contact inputs/outputs on the DISBUS
Example:
Enquiry telegram to VEGACOM 557 (2 Byte):
0xCC 0x21 Block no. 33 ( contact input block/output block) is enquired
Answering telegram of VEGACOM 557 (50Byte):
0xCC 0x20 0x80 0x80 0xEE 0xRR 0xEE 0xRR 0xEE 0xRR 0xEE 0xRR 0xEE 0xRR ...
Control word reserved VEGAMET 1 VEGAMET 2 VEGAMET 3 VEGAMET 4 VEGAMET 5
Data image in VEGACOM 557
Status of the outputs:
0 = all outputs OK
1 = output status not available (no outputs
configured or VEGAMET not available)
Switching conditions of outputs 1, 2 and 3
(output 3 corresponds to fail safe relay):
0 = relay is deenergised
1 = relay is energised