import ctypes

import snap7

from snap7.types import Areas, S7DataItem, S7WLWord, S7WLReal, S7WLTimer

from snap7.util import set_int, set_real, get_int, get_real, get_s5time

client = snap7.client.Client()

client.connect('192.168.100.100', 0, 2)

items = []

def set_data_item(area, word_len, db_number: int, start: int, amount: int, data: bytearray) -> S7DataItem:

item = S7DataItem()

item.Area = ctypes.c_int32(area)

item.WordLen = ctypes.c_int32(word_len)

item.DBNumber = ctypes.c_int32(db_number)

item.Start = ctypes.c_int32(start)

item.Amount = ctypes.c_int32(amount)

array_class = ctypes.c_uint8 * len(data)

cdata = array_class.from_buffer_copy(data)

item.pData = ctypes.cast(cdata, ctypes.POINTER(array_class)).contents

return item

int_values = [10, 20, 30, 40]

ints = bytearray(len(int_values) * 2)

for i, value in enumerate(int_values):

set_int(ints, i * 2, value)

real = bytearray(4)

set_real(real, 0, 42.5)

counters = 0x2999.to_bytes(2, 'big') + 0x1111.to_bytes(2, 'big')

item1 = set_data_item(area=Areas.DB, word_len=S7WLWord, db_number=1, start=0, amount=4, data=ints)

item2 = set_data_item(area=Areas.DB, word_len=S7WLReal, db_number=1, start=8, amount=1, data=real)

item3 = set_data_item(area=Areas.TM, word_len=S7WLTimer, db_number=0, start=2, amount=2, data=counters)

items.append(item1)

items.append(item2)

items.append(item3)

client.write_multi_vars(items)

db_int = client.db_read(1, 0, 8)

db_real = client.db_read(1, 8, 12)

db_counters = client.ct_read(2, 2)

print(f'int values: {[get_int(db_int, i * 2) for i in range(4)]}')

print(f'real value: {get_real(db_real, 0)}')

print(f'counters: {get_s5time(counters, 0)}, {get_s5time(counters, 2)}')