Basler Electric DECS-250N - Manual (Page 262)

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PROFIBUS Communication DECS-250N
2. Using PLC configuration software, import the DECS-250N GSD file. This allows the DECS-250N to
be included in the bus configuration as a slave.
3. Assign a unique PROFIBUS address to the DECS-250N. This allows the master to exchange data
with the DECS-250N.
4. Select modules from the DECS-250N GSD file to be part of the data exchange. Selecting the cyclic
parameters is recommended. The cyclic parameters are comprised of the first 12 instances in the
PROFIBUS parameters table (Table 40). The first 25 parameters, which make up the first five
instances, are float types. The next 59 parameters, which make up the last seven instances of cyclic
parameters, are UINT8 types.
5. Set each selected module to an address in the master's memory bank.
6. Compile and download the configuration to the master before going online.
When the PROFIBUS network is initialized, the master connects to each slave checking for address
mismatches and sending configuration data. The configuration data is sent so that the master and slave
agree on the data exchange to occur. Then, the master begins polling each slave in a cyclic order.
Note
It is not possible to write a portion of an instance by specifying a length
smaller than the size of the instance. To modify a single parameter,
read the entire instance, update the desired parameter, and write the
entire instance back to the device.
PROFIBUS Parameters
PROFIBUS parameters are listed in Table 40. Instances with names ending in “cyclic” are automatically
transmitted at a periodic rate. All other instances are acyclic and transmitted only when requested by the
PLC.
Table 40. PROFIBUS Parameters
Instance Name Inst. # Type RW Key Name Unit Range
Gen Metering Cyclic 1 Float R VAB GG V 0 - 2000000000
Gen Metering Cyclic 1 Float R VBC GG V 0 - 2000000000
Gen Metering Cyclic 1 Float R VCA GG V 0 - 2000000000
Gen Metering Cyclic 1 Float R IA GG Amp 0 - 2000000000
Gen Metering Cyclic 1 Float R IB GG Amp 0 - 2000000000
Gen Metering Cyclic 1 Float R IC GG Amp 0 - 2000000000
Gen Metering Cyclic 1 Float R Freq GG Hz 10 - 180
Gen Metering Cyclic 1 Float R Total Watts AVG GG Watt -3.00E+14 - 3.00E+14
Gen Metering Cyclic 1 Float R Total Vars AVG GG Var -3.00E+14 - 3.00E+14
Gen Metering Cyclic 1 Float R Total S GG VA -3.00E+14 - 3.00E+14
Gen Metering Cyclic 1 Float R Total PF GG PF -1 - 1
Bus Metering Cyclic 2 Float R VAB GG V 0 - 2000000000
Bus Metering Cyclic 2 Float R VBC GG V 0 - 2000000000
Bus Metering Cyclic 2 Float R VCA GG V 0 - 2000000000
Bus Metering Cyclic 2 Float R Freq GG Hz 10 - 180
Field Metering Cyclic 3 Float R VX GG V -1000 - 1000
Field Metering Cyclic 3 Float R IX GG Amp 0 - 2000000000
Setpoint Metering Cyclic 4 Float R Gen Vol Setpoint GG V 84 - 144
Setpoint Metering Cyclic 4 Float R Exc Cur Setpoint GG Amp 0 - 12
Setpoint Metering Cyclic 4 Float R Exc Vol Setpoint GG V 0 - 75
Setpoint Metering Cyclic 4 Float R Gen Var Setpoint GG kvar 0 – 41.57
Setpoint Metering Cyclic 4 Float R Gen Pf Setpoint GG PF 0.5 – -0.5