Read / Write primitive values

Data type conversion

TwinCAT type	Python type	Comment
BOOL	bool
BYTE	int	8bit, unsigned
WORD	int	16bit, unsigned
DWORD	int	32bit, unsigned
LWORD	int	64bit, unsigned
SINT	int	8bit, signed
INT	int	16bit, signed
DINT	int	32bit, signed
LINT	int	64bit, signed
USINT	int	8bit, unsigned
UINT	int	16bit, unsigned
UDINT	int	32bit, unsigned
ULINT	int	64bit, unsigned
REAL	float	32bit, float
LREAL	float	64bit, float

from py_ads_client import BOOL, INT, REAL, ADSClient, ADSSymbol

plc_ip = "192.168.88.20"
plc_ams_net_id = "192.168.88.20.1.1"
local_ams_net_id = "192.168.88.100.1.1"

client = ADSClient(local_ams_net_id=local_ams_net_id)
client.open(target_ams_net_id=plc_ams_net_id, target_ip=plc_ip)

bool_symbol = ADSSymbol(name="GVL.boolVar", plc_t=BOOL)
client.write_symbol(symbol=bool_symbol, value=True)
bool_value = client.read_symbol(bool_symbol)
assert bool_value is True

int_symbol = ADSSymbol(name="GVL.intVar", plc_t=INT)
client.write_symbol(symbol=int_symbol, value=123)
int_value = client.read_symbol(int_symbol)
assert int_value == 123

real_symbol = ADSSymbol(name="GVL.realVar", plc_t=REAL)
client.write_symbol(symbol=real_symbol, value=100.23)
real_value = client.read_symbol(real_symbol)
assert round(real_value, 2) == 100.23

client.close()