def test_write(self):
"""Test symbol value writing"""
with self.plc:
symbol = AdsSymbol(self.plc, name=self.test_var.name)
symbol.write(3.14) # Write
r_value = self.plc.read(
self.test_var.index_group,
self.test_var.index_offset,
self.test_var.plc_type,
)
self.assertEqual(3.14, r_value)
self.assertAdsRequestsCount(3) # READWRITE for info, WRITE and
def test_init_by_name_array(self):
"""Test symbol creation when it's an array"""
var = PLCVariable(
"ArrayVar",
ads_type=constants.ADST_INT16, # dataType does not represent
# array unfortunately
symbol_type="ARRAY [1..5] OF INT", # Array looks like this in PLC
)
var.plc_type = constants.PLCTYPE_ARR_INT(5) # Have to do this
# manually
self.handler.add_variable(var)
self.plc.open()
symbol = AdsSymbol(self.plc, name=var.name)
# Verify looked up info
self.assertEqual(var.name, symbol.name)
self.assertEqual(var.index_group, symbol.index_group)
self.assertEqual(var.index_offset, symbol.index_offset)
self.assertEqual(var.plc_type, symbol.plc_type)
self.assertEqual(var.symbol_type, symbol.symbol_type)
self.assertIsNone(symbol.comment)
my_list = symbol.read()
self.assertIsInstance(my_list, list)
self.assertEqual(5, len(my_list))
my_list[4] = 420
symbol.write(my_list) # Modify array
my_list2 = symbol.read() # Read again
self.assertEqual(my_list, my_list2)
self.assertAdsRequestsCount(4) # A READWRITE (for info), READ,
def test_value(self):
"""Test the buffer property"""
with self.plc:
symbol = AdsSymbol(self.plc, name=self.test_var.name)
symbol.value = 420.0 # Shouldn't change anything yet
self.assertAdsRequestsCount(1) # Only a READWRITE for info
symbol.write()
self.assertAdsRequestsCount(2) # Written from buffer
symbol.read()
for i in range(10):
custom_buffer = symbol.value
self.assertEqual(420.0, symbol.value)
self.assertAdsRequestsCount(3) # Read only once