Samuele Locatelli
229 lines
8.8 KiB
Python
229 lines
8.8 KiB
Python
import snap7
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import struct
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import time
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import os
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from snap7.util import get_int, get_dint, get_real, get_string
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# Configurazione PLC
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PLC_IP = '127.0.0.1'
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# PLC_IP = '192.168.124.43'
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RACK = 0
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SLOT = 2
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# Codici Colore ANSI
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GREEN = "\033[92m"
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RED = "\033[91m"
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RESET = "\033[0m"
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class SiemensClient:
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def __init__(self, ip, rack, slot):
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self.client = snap7.client.Client()
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self.rack = rack
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self.slot = slot
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self.ip = ip
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def connect(self):
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try:
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self.client.connect(self.ip, self.rack, self.slot)
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print(f"Connesso a {self.ip}")
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return True
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except Exception as e:
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print(f"Errore di connessione: {e}")
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return False
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def read_db900_db901(self):
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# Lettura DB900 (16KB)
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start_time = time.perf_counter()
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#~nel test leggo solo 40 valori + counter iniziale
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db900_data = self.client.db_read(900, 0, 404)
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end_time = time.perf_counter()
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db900_duration = (end_time - start_time) * 1000
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# Lettura DB901 (38 byte)
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start_time_901 = time.perf_counter()
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db901_data = self.client.db_read(901, 0, 38)
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end_time_901 = time.perf_counter()
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db901_duration = (end_time_901 - start_time_901) * 1000
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# Parsing DB901 (DINT e Bit)
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status_901 = db901_data[0]
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acquisizione_901 = (status_901 & 0x02) != 0
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fine_acq_901 = (status_901 & 0x04) != 0
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pronti_901 = (status_901 & 0x08) != 0
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# Parsing DB900 (DINT) - Primi 21 valori (DBD0-DBD80)
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# DBD0: Numero misure (DINT)
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# num_misure = struct.unpack('<I', db900_data[0:4])[0]
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num_misure = get_dint(db900_data,0)
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# Array misure (da DBD4 in poi)
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valori_db900 = []
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for i in range(21):
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offset = (i * 4)
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if offset + 4 <= 164:
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valori_db900.append(get_dint(db900_data,offset))
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else:
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valori_db900.append(0)
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return {
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"db900_data": valori_db900,
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"db900_num_misure": num_misure,
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"db901_status": {
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"acquisizione": acquisizione_901,
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"pronti": pronti_901,
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"fine_acq": fine_acq_901
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},
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"db901_duration": db901_duration,
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"db900_duration": db900_duration
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}
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def read_db100(self):
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start_time = time.perf_counter()
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data = self.client.db_read(100, 0, 192)
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end_time = time.perf_counter()
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duration = (end_time - start_time) * 1000 # in ms
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# Parsing Status Bits (DBD0)
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status_bytes = data[0:4]
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# Bit 0: Acquisizione (1=On, 0=Off)
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acquisizione = (status_bytes[0] & 0x01) != 0
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# Bit 8 (primo bit del secondo byte)
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# Nota: Se il PLC mappa il bit 9 come il primo bit del byte 1,
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# lo shift è 0x80 (10000000 in binario)
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pronti = (status_bytes[1] & 0x80) != 0
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# Parsing REAL (32-bit Float) in BIG-ENDIAN (>)
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params = {}
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params['x_iniziale'] = get_real(data,4)
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params['x_finale'] = get_real(data,8)
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params['limite_sup'] = get_real(data,12)
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params['limite_inf'] = get_real(data,16)
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params['tipo_lettura'] = get_real(data,20)
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params['conteggio'] = get_real(data,24)
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params['param_arco'] = get_real(data,28)
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params['param_extra1'] = get_real(data,32)
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params['param_extra2'] = get_real(data,36)
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params['param_extra3'] = get_real(data,40)
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# X_Live: DBD56 (Byte 56-59), Y_Live: DBD60 (Byte 60-63)
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params['x_live'] = get_real(data,56)
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params['y_live'] = get_real(data,60)
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# Tempo di lettura della DB100
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params['db100_time'] = duration
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strings = {
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"Comm": get_string(data,64),
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"Art": get_string(data,96),
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"IdCont": get_string(data,128),
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"Altro": get_string(data,160)
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}
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return {
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"status": {"acquisizione": acquisizione, "pronti": pronti},
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"params": params,
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"strings": strings
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}
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def read_db101(self):
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start_time = time.perf_counter()
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data = self.client.db_read(101, 0, 160)
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end_time = time.perf_counter()
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duration = (end_time - start_time) * 1000 # in ms
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try:
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values = struct.unpack('>40f', data)
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return values, duration
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except Exception as e:
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print(f"Errore lettura DB101: {e}")
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return None, duration
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def disconnect(self):
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self.client.disconnect()
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def clear_screen():
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os.system('cls' if os.name == 'nt' else 'clear')
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if __name__ == "__main__":
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plc = SiemensClient(PLC_IP, RACK, SLOT)
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if plc.connect():
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try:
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while True:
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clear_screen()
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db100_data = plc.read_db100()
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db101_data, db101_time = plc.read_db101()
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db900_data = plc.read_db900_db901()
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print("=" * 60)
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print(f" PLC MONITOR - {PLC_IP} ")
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print("=" * 60)
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print(f" STATO: Acquisizione={db100_data['status']['acquisizione']} | Pronti={db100_data['status']['pronti']}")
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print(f" LATENZA: DB100={db100_data['params']['db100_time']:.2f}ms | DB901={db900_data['db901_duration']:.2f}ms")
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print("-" * 60)
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print(f" VALORI LIVE:")
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print(f" X_Live (DBD56): {db100_data['params']['x_live']:>10.4f}")
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print(f" Y_Live (DBD60): {db100_data['params']['y_live']:>10.4f}")
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print("-" * 60)
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print(f" DATI STRINGHE:")
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print(f" Commessa: {db100_data['strings']['Comm']}")
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print(f" Articolo: {db100_data['strings']['Art']}")
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print(f" IdCont: {db100_data['strings']['IdCont']}")
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print(f" Altro: {db100_data['strings']['Altro']}")
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print("-" * 60)
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# Gestione DB101 con grafico a barre centrato
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if db101_data:
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# Prendi i primi 20 valori
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data_subset = db101_data[:20]
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print(f" VISUALIZZAZIONE DB101 (Primi {len(data_subset)}):")
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if data_subset:
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# Scala fissa basata sui tuoi dati (-2..+2)
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scale_max = 2.0
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for i, val in enumerate(data_subset):
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# Calcola larghezza barra (max 15 caratteri per lato del centro)
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bar_len = int((abs(val) / scale_max) * 15)
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bar_len = min(bar_len, 15)
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bar = "█" * bar_len
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if val > 0:
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# Cresce verso destra: [ |███████████████]
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left_side = "-" * 15
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right_side = bar + "-" * (15 - bar_len)
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color = GREEN
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line = f" [{i+1:02d}] {left_side}|{color}{right_side}{RESET} {val:>8.4f}"
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elif val < 0:
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# Cresce verso sinistra: [-------█████████████| ]
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left_side = "-" * (15 - bar_len) + bar
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right_side = "-" * 15
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color = RED
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line = f" [{i+1:02d}] {color}{left_side}{RESET}|{right_side} {val:>8.4f}"
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else:
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# Valore zero: [ | ]
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line = f" [{i+1:02d}] {'-' * 15}|{'-' * 15} {val:>8.4f}"
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print(line)
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print("-" * 60)
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print(f" DATI DB900 (Primi {len(db900_data['db900_data'])} DINT):")
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# Mostra i primi 21 valori della DB900
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for i, val in enumerate(db900_data['db900_data']):
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# Il primo valore (index 0) è il numero di misure
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if i == 0:
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print(f" [000] Num. Misure: {val}")
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else:
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print(f" [{i:03d}] Valore DINT: {val}")
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print("-" * 60)
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# Campionamento dinamico
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if db100_data['status']['acquisizione']:
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time.sleep(0.5)
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else:
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time.sleep(2.0)
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except KeyboardInterrupt:
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print("\nInterruzione utente.")
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finally:
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plc.disconnect()
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