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Snap7-based example of retrieving the date and time from a DTL-field, DATE-field, or TOD-field (time of day). Tested on a Siemens 1214C PLC.
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| import datetime | |
| import snap7 | |
| from snap7.util import * | |
| class DtlExample: | |
| def __init__(self, ip, db): | |
| self.plc = snap7.client.Client() | |
| self.ip = ip | |
| self.db = db | |
| def connect(self): | |
| self.plc.connect(self.ip, 0, 0) | |
| def db_read(self, offset, length): | |
| return self.plc.db_read(self.db, offset, length) | |
| def disconnect(self): | |
| self.plc.disconnect() | |
| def get_date(self, offset): | |
| date = datetime.datetime(1990, 1, 1) | |
| return date + datetime.timedelta(get_int(self.db_read(offset, 2)[0:2], 0)) | |
| def get_dtl(self, offset): | |
| dtl = self.db_read(offset, 12) | |
| return datetime.datetime(get_int(dtl, 0), ord(dtl[2:3]), ord(dtl[3:4]), ord(dtl[5:6]), ord(dtl[6:7]), | |
| ord(dtl[7:8]), get_dword(dtl, 8)/1000) | |
| def get_time_of_day(self, offset): | |
| now = datetime.datetime.now().replace(hour=0, minute=0, second=0, microsecond=0) | |
| return now + datetime.timedelta(milliseconds=self.get_dword(offset)) | |
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