from snap7 import client

def connect_plc()->client.Client:
    plc = client.Client()
    plc.set_connection_type(3)
    plc.connect("192.168.5.20",0,1)
    return plc

def write_to_plc(start_addr,byte:bytes):
    plc = connect_plc()
    plc.db_write(1,start_addr,byte)
    plc.disconnect()

def read_plc(start_addr,num)->bytearray:
    plc=connect_plc()
    data = plc.db_read(1, start_addr, num)
    plc.disconnect()
    return data

#byte -128--127 �з�̖      0--255 �o��̖    1 bytes
#word  -32768--32767       0--65535        2 bytes
#vd                                        4bytes

vb0 =78
vb0_byte = vb0.to_bytes(1,'big',signed=False)
# print(vb0_byte)

vw10 = 45678
vw10_byte = vw10.to_bytes(2,'big',signed=False)


vw12 = -3455
vw12_byte = vw12.to_bytes(2,'big',signed=True)


vd20 = 888898899
vd20_byte = vd20.to_bytes(4,'big',signed=False)


# write_to_plc(0,vb0_byte)
# write_to_plc(10,vw10_byte)
# write_to_plc(12,vw12_byte)
# write_to_plc(20,vd20_byte)

# print(int.from_bytes(b'N', 'big', signed=False))


data = read_plc(0,1)
print(int.from_bytes(data, 'big', signed=False))

data2 = read_plc(10,2)
print(int.from_bytes(data2,'big',signed=True))