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Merged
janiversen merged 3 commits into from
Aug 21, 2026
+368 −187
Merged

Simulator support for FLOAT64 type. #3002

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02c3cfb
Simulator support for FLOAT64 type.
pkubanek Aug 20, 2026
acb1b7c
coverage 100%.
janiversen Aug 21, 2026
8bf8cee
Merge branch 'dev' into fix/float64-simulator
janiversen Aug 21, 2026
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11 changes: 8 additions & 3 deletions examples/datastore_simulator_share.py
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Original file line number Diff line number Diff line change
Expand Up @@ -54,13 +54,15 @@
"uint16": 1,
"uint32": 45000,
"float32": 127.4,
"float64": 505.14,
"string": "X",
},
"action": {
"bits": None,
"uint16": None,
"uint32": None,
"float32": None,
"float64": None,
"string": None,
},
},
Expand Down Expand Up @@ -102,11 +104,14 @@
{"addr": [33, 36], "value": 5678.19},
{"addr": [37, 40], "value": 345000.18, "action": "increment"},
],
"float64": [
{"addr": [41, 44], "value": -42478.53, "action": "random"},
],
"string": [
{"addr": [41, 42], "value": "Str"},
{"addr": [43, 44], "value": "Strx"},
{"addr": [45, 46], "value": "Str"},
{"addr": [47, 48], "value": "Strx"},
],
"repeat": [{"addr": [0, 45], "to": [46, 138]}],
"repeat": [{"addr": [0, 48], "to": [49, 147]}],
}


Expand Down
41 changes: 27 additions & 14 deletions examples/simulator.py
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Original file line number Diff line number Diff line change
Expand Up @@ -13,25 +13,27 @@

from pymodbus import FramerType
from pymodbus.client import AsyncModbusTcpClient
from pymodbus.datastore import ModbusSimulatorContext
from pymodbus.datastore import CellType, ModbusSimulatorContext
from pymodbus.server import ModbusSimulatorServer, get_simulator_commandline


_logger = logging.getLogger(__file__)


async def read_registers(
client, addr, count, is_int, curval=None, minval=None, maxval=None
client, addr, count, celltype: CellType, curval=None, minval=None, maxval=None
):
"""Run modbus call."""
rr = await client.read_holding_registers(addr, count=count, device_id=1)
assert not rr.isError()
if count == 1:
value = rr.registers[0]
else:
value = ModbusSimulatorContext.build_value_from_registers(rr.registers, is_int)
if not is_int:
value = round(value, 1)
value = ModbusSimulatorContext.build_value_from_registers(
rr.registers, celltype
)
if not CellType.is_int(celltype):
value = round(value, 2)
if curval:
assert value == curval, f"{value} == {curval}"
else:
Expand All @@ -43,19 +45,30 @@ async def run_calls(client, count):
_logger.info("### Read fixed/increment/random value of different types.")
_logger.info("--> UINT16")
for count in range(1, 5):
await read_registers(client, 1148, 1, True, curval=32117)
await read_registers(client, 2305, 1, True, curval=50 + count)
await read_registers(client, 2306, 1, True, minval=45, maxval=55)
await read_registers(client, 1148, 1, CellType.UINT16, curval=32117)
await read_registers(client, 2305, 1, CellType.UINT16, curval=50 + count)
await read_registers(client, 2306, 1, CellType.UINT16, minval=45, maxval=55)

_logger.info("--> UINT32")
await read_registers(client, 3188, 2, True, curval=32514)
await read_registers(client, 3876, 2, True, curval=50000 + count)
await read_registers(client, 3878, 2, True, minval=45000, maxval=55000)
await read_registers(client, 3188, 2, CellType.UINT32, curval=32514)
await read_registers(client, 3876, 2, CellType.UINT32, curval=50000 + count)
await read_registers(
client, 3878, 2, CellType.UINT32, minval=45000, maxval=55000
)

_logger.info("--> FLOAT32")
await read_registers(client, 4188, 2, False, curval=32514.2)
await read_registers(client, 4876, 2, False, curval=50000.0 + count)
await read_registers(client, 4878, 2, False, minval=45000.0, maxval=55000.0)
await read_registers(client, 4188, 2, CellType.FLOAT32, curval=32514.2)
await read_registers(client, 4876, 2, CellType.FLOAT32, curval=50000.0 + count)
await read_registers(
client, 4878, 2, CellType.FLOAT32, minval=45000.0, maxval=55000.0
)

_logger.info("--> FLOAT64")
await read_registers(client, 5092, 4, CellType.FLOAT64, curval=-32514.2)
await read_registers(client, 5164, 4, CellType.FLOAT64, curval=-42.15 + count)
await read_registers(
client, 5244, 4, CellType.FLOAT64, minval=-4242, maxval=314.92
)


async def run_simulator():
Expand Down
3 changes: 2 additions & 1 deletion pymodbus/datastore/__init__.py
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
"""Datastore."""

__all__ = [
"CellType",
"ModbusDeviceContext",
"ModbusSequentialDataBlock",
"ModbusServerContext",
Expand All @@ -13,5 +14,5 @@
ModbusServerContext,
)
from .sequential import ModbusSequentialDataBlock
from .simulator import ModbusSimulatorContext
from .simulator import CellType, ModbusSimulatorContext
from .sparse import ModbusSparseDataBlock
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