This repository was archived by the owner on Mar 16, 2023. It is now read-only.
Repository navigation
Expand file tree
/
Copy pathexample.py
More file actions
246 lines (183 loc) · 5.64 KB
/
Copy pathexample.py
File metadata and controls
246 lines (183 loc) · 5.64 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
import time
import snap7
from snap7 import util
from db_layouts import rc_if_db_1_layout
from db_layouts import tank_rc_if_db_layout
print """
THIS IS EXAMPLE CODE MEANTH TO BE READ.
It is used to manipulate a large DB object with over
450 'rows' which represent valves
You don't have a project and PLC like I have which I used
to create the test code with.
"""
client = snap7.client.Client()
client.connect('192.168.200.24', 0, 3)
def get_db1():
"""
Here we read out DB1, all data we is put in the all_data
variable and is a bytearray with the raw plc data
"""
all_data = client.db_get(1)
for i in range(400): # items in db
row_size = 130 # size of item
index = i * row_size
offset = index + row_size # end of row in db
util.print_row(all_data[index:offset])
def get_db_row(db, start, size):
"""
Here you see and example of readying out a part of a DB
Args:
db (int): The db to use
start (int): The index of where to start in db data
size (int): The size of the db data to read
"""
type_ = snap7.snap7types.wordlen_to_ctypes[snap7.snap7types.S7WLByte]
data = client.db_read(db, start, type_, size)
# print_row(data[:60])
return data
def set_db_row(db, start, size, _bytearray):
"""
Here we replace a piece of data in a db block with new data
Args:
db (int): The db to use
start(int): The start within the db
size(int): The size of the data in bytes
_butearray (enumerable): The data to put in the db
"""
client.db_write(db, start, size, _bytearray)
def show_row(x):
"""
print data in DB of row/object X in
"""
row_size = 126
while True:
data = get_db_row(1, 4 + x * row_size, row_size)
row = snap7.util.DB_Row(data, rc_if_db_1_layout,
layout_offset=4)
print 'name', row['RC_IF_NAME']
print row['RC_IF_NAME']
break
# do some write action..
# do some check action..
def get_row(x):
row_size = 126
data = get_db_row(1, 4 + x * row_size, row_size)
row = snap7.util.DB_Row(
data, rc_if_db_1_layout,
layout_offset=4)
return row
def set_row(x, row):
"""
We use db 1, use offset 4, we replace row x. To find the correct
start_index we mulitpy by row_size by x and we put the
byte array representation of row in the PLC
"""
row_size = 126
set_db_row(1, 4 + x * row_size, row_size, row._bytearray)
def open_row(row):
"""
open a valve
"""
# row['AutAct'] = 1
row['Occupied'] = 1
row['BatchName'] = 'test'
row['AutModLi'] = 1
row['ManModLi'] = 0
row['ModLiOp'] = 1
row['CloseAut'] = 0
row['OpenAut'] = 1
# row['StartAut'] = True
# row['StopAut'] = False
# row['RstLi'] = True
# row['StringValue'] = 'test'
def close_row(row):
"""
close a valve
"""
# print row['RC_IF_NAME']
row['BatchName'] = ''
row['Occupied'] = 0
row['CloseAut'] = 1
row['OpenAut'] = 0
#show_row(0)
#show_row(1)
def open_and_close():
for x in range(450):
row = get_row(x)
open_row(row)
set_row(x, row)
time.sleep(3)
for x in range(450):
row = get_row(x)
close_row(row)
set_row(x, row)
def set_part_db(start, size, _bytearray):
data = _bytearray[start:start+size]
set_db_row(1, start, size, data)
def write_data_db(dbnumber, all_data, size):
area = snap7.snap7types.S7AreaDB
dbnumber = 1
client.write_area(area, dbnumber, 0, size, all_data)
def open_and_close_db1():
t = time.time()
db1 = make_item_db(1)
all_data = db1._bytearray
print 'row objects: ', len(db1.index)
for x, (name, row) in enumerate(db1.index.items()):
open_row(row)
#set_part_db(4+x*126, 126, all_data)
t = time.time()
write_data_db(1, all_data, 4 + 126 * 450)
print 'opening all valves took: ', time.time() - t
print 'sleep...'
time.sleep(5)
for x, (name, row) in enumerate(db1):
close_row(row)
#set_part_db(4+x*126, 126, all_data)
print time.time() - t
t = time.time()
write_data_db(1, all_data, 4 + 126 * 450)
print 'closing all valves took: ', time.time() - t
def read_tank_db():
db73 = make_tank_db()
print len(db73)
for x, (name, row) in enumerate(db73):
print row
def make_item_db(db_number):
t = time.time()
all_data = client.db_upload(db_number)
print 'getting all data took: ', time.time() - t
db1 = snap7.util.DB(
db_number, # the db we use
all_data, # bytearray from the plc
rc_if_db_1_layout, # layout specification
126, # size of the specification
450, # number of row's / specifocations
id_field='RC_IF_NAME', # field we can use to make row
layout_offset=4, # sometimes specification does not start a 0
db_offset=4 # At which point in all_data should we start
# parsing for data
)
return db1
def make_tank_db():
tank_data = client.db_upload(73)
db73 = snap7.util.DB(
73, tank_data, tank_rc_if_db_layout,
238, 2, id_field='RC_IF_NAME')
return db73
def print_tag():
db1 = make_item_db(1)
print db1['5V315']
def print_open():
db1 = make_item_db(1)
for x, (name, row) in enumerate(db1):
if row['BatchName']:
print row
#read_tank_db()
#open_and_close()
#open_and_close_db1()
#time.sleep(1)
#show_row(2)
print_tag()
#print_open()
client.disconnect()