I was assigned to perform the task without any documentation. I have a problem with reading data from MODBUS. This is the script that I was able to create:
from pymodbus.constants import Endian
from pymodbus.payload import BinaryPayloadDecoder
from pymodbus.payload import BinaryPayloadBuilder
from pymodbus.client.sync import ModbusTcpClient
client = ModbusTcpClient('X.X.X.X')
connection = client.connect()
request = client.read_holding_registers(12606,2)
result = request.registers
decoder = BinaryPayloadDecoder.fromRegisters(result, Endian.Big, wordorder=Endian.Little)
print "Counter1: %0.2f" % decoder.decode_32bit_float()
request = client.read_holding_registers(12482,2)
result = request.registers
decoder = BinaryPayloadDecoder.fromRegisters(result, Endian.Big, wordorder=Endian.Little)
print "Counter2: %0.2f" % decoder.decode_32bit_float()
client.close()
Everything looks fine, But the data on the counter is different from those in the script for example:
Value on the counter : 39558853.30 (value is decimal)
Value from the script: 58853.30
(value is decimal)
Read input registers (HEX): E54D 4765
And this is how the address documentation looks like"
P 12458 Q2 4\DW12458 = 1\ND20_Q2\P(F)
Q 12462 Q2 4\DW12462 = 1\ND20_Q2\Q(F)
S 12466 Q2 4\DW12466 = 1\ND20_Q2\S(F)
I 12470 Q2 4\DW12470 = 1\ND20_Q2\I(F)
U 12474 Q2 4\DW12474 = 1\ND20_Q2\U(F)
f 12478 Q2 4\DW12478 = 1\ND20_Q2\f(F)
EP_POB 12482 Q2 4\DW12482 = 1\ND20_Q2\EP_POB(F)
EP_ODD 12486 Q2 4\DW12486 = 1\ND20_Q2\EP_ODD(F)
EQ_IND 12490 Q2 4\DW12490 = 1\ND20_Q2\EQ_IND(F)
EQ_POJ 12494 Q2 4\DW12494 = 1\ND20_Q2\EQ_POJ(F)
THDVL1 12498 Q2 4\DW12498 = 1\ND20_Q2\THDVL1(F)
THDVL2 12502 Q2 4\DW12502 = 1\ND20_Q2\THDVL2(F)
THDVL3 12506 Q2 4\DW12506 = 1\ND20_Q2\THDVL3(F)
THDIL1 12510 Q2 4\DW12510 = 1\ND20_Q2\THDIL1(F)
THDIL2 12514 Q2 4\DW12514 = 1\ND20_Q2\THDIL2(F)
THDIL3 12518 Q2 4\DW12518 = 1\ND20_Q2\THDIL3(F)
UL1 12522 Q2 4\DW12522 = 1\ND20_Q2\UL1(F)
UL2 12526 Q2 4\DW12526 = 1\ND20_Q2\UL2(F)
UL3 12530 Q2 4\DW12530 = 1\ND20_Q2\UL3(F)
IL1 12534 Q2 4\DW12534 = 1\ND20_Q2\IL1(F)
IL2 12538 Q2 4\DW12538 = 1\ND20_Q2\IL2(F)
IL3 12542 Q2 4\DW12542 = 1\ND20_Q2\IL3(F)
PL1 12546 Q2 4\DW12546 = 1\ND20_Q2\PL1(F)
PL2 12550 Q2 4\DW12550 = 1\ND20_Q2\PL2(F)
PL3 12554 Q2 4\DW12554 = 1\ND20_Q2\PL3(F)
QL1 12558 Q2 4\DW12558 = 1\ND20_Q2\QL1(F)
QL2 12562 Q2 4\DW12562 = 1\ND20_Q2\QL2(F)
QL3 12566 Q2 4\DW12566 = 1\ND20_Q2\QL3(F)
S1 12570 Q2 4\DW12570 = 1\ND20_Q2\S1(F)
S2 12574 Q2 4\DW12574 = 1\ND20_Q2\S2(F)
S3 12578 Q2 4\DW12578 = 1\ND20_Q2\S3(F)