198 lines
7.0 KiB
Python
198 lines
7.0 KiB
Python
"""
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Tag Logger.
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Created on April 7, 2016
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@author: Patrick McDonagh
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@description: Continuously loops through a list of tags to store values from a PLC
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"""
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import traceback
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import time
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import json
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import requests
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from requests.packages.urllib3.exceptions import InsecureRequestWarning
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# from pycomm_helper.tag import Tag
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from pycomm.ab_comm.clx import Driver as ClxDriver
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from pycomm.cip.cip_base import CommError
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requests.packages.urllib3.disable_warnings(InsecureRequestWarning)
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# DEFAULTS
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db_address = "10.0.0.103"
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db_url = "https://{}".format(db_address)
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scan_rate = 30 # seconds
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save_all = "test" # use True, False, or any string
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plc_handshake_tags = {}
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last_handshake_time = 0
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tag_store = {}
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tag_list = []
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handshake_list = []
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device_types = {}
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def readFromPLC(addr, tag):
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"""Read a value from a PLC."""
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addr = str(addr)
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tag = str(tag)
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c = ClxDriver()
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if c.open(addr):
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try:
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v = c.read_tag(tag)
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return v
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except Exception:
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print("ERROR RETRIEVING TAG: {} at {}".format(tag, addr))
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err = c.get_status()
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c.close()
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print(err)
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pass
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c.close()
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def store_tag(tag):
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"""Store the value of a tag in the web_db."""
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global db_url
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url = "{}/api/tag_vals".format(db_url)
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tag_val_obj = {
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"tag_id": tag['id'],
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"value": tag['last_stored']
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}
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headers = {"Content-Type": "application/json"}
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r = requests.post(url, data=json.dumps(tag_val_obj), headers=headers, verify=False)
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return r.status_code == 200
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def load_data():
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"""Load configuration data from the web server."""
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global db_url, scan_rate, save_all, tag_list, handshake_list
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try:
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# Get tags stored in database
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url = '{}/api/tags'.format(db_url)
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get_tag_request = requests.get(url, verify=False)
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tags = json.loads(get_tag_request.text)
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except Exception as e:
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print("Error getting tags: {}".format(e))
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time.sleep(10)
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main()
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try:
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# Get device types stored in database
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get_device_type_request = requests.get('{}/api/device_types'.format(db_url), verify=False)
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device_types_json = json.loads(get_device_type_request.text)
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for t in device_types_json['objects']:
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device_types[t['id']] = t['device_type']
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except Exception as e:
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print("Error getting tags: {}".format(e))
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time.sleep(10)
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main()
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try:
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config_req = requests.get('{}/api/configs'.format(db_url), verify=False)
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config_json = json.loads(config_req.text)
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config_list = config_json['objects']
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if len(config_list) > 0:
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for c in config_list:
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if c['parameter'] == "scan_rate":
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scan_rate = float(c['val'])
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elif c['parameter'] == "save_all":
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save_all = c['val']
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except Exception as e:
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print("Error getting configs: {}".format(e))
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new_tags = [t['name'] for t in tags['objects']]
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existing_tags = [t['name'] for t in tag_list]
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existing_handshakes = [t['name'] for h in handshake_list]
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tags_to_add = []
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handshakes_to_add = []
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tags_to_copy = []
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handshakes_to_copy = []
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for t in new_tags:
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this_tag = {}
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for n_t in tags['objects']:
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if n_t['name'] == t:
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this_tag["tag"] = n_t['tag']
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this_tag["id"] = n_t["id"]
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this_tag["name"] = n_t['name']
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this_tag["change_threshold"] = n_t['change_threshold']
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this_tag["guarantee_sec"] = n_t['guarantee_sec']
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this_tag["ip_address"] = n_t['device']['address']
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this_tag["device_type"] = device_types[n_t['device']['device_type_id']]
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this_tag["last_stored"] = 0.0
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this_tag["last_store_time"] = 0
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if t in existing_tags:
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for e_t in tag_list:
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if e_t['name'] == t:
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this_tag['last_stored'] = e_t['last_stored']
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this_tag['last_store_time'] = e_t['last_store_time']
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tags_to_copy.append(this_tag)
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elif t in existing_handshakes:
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for e_h in handshake_list:
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if e_h['name'] == h:
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this_tag['last_stored'] = e_h['last_stored']
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this_tag['last_store_time'] = e_h['last_store_time']
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handshakes_to_copy.append(this_tag)
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else:
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if n_t['tag_class_id'] == 5:
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tags_to_add.append(this_tag)
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elif n_t['tag_class_id'] == 6:
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handshakes_to_add.append(this_tag)
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tag_list = tags_to_add + tags_to_copy
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handshake_list = handshakes_to_add + handshakes_to_copy
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def main():
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"""Run the main routine."""
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global scan_rate, tag_store, device_types, tag_list, handshake_list, save_all
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while True:
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load_data()
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# print(tag_list)
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if len(tag_list) > 0:
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for i in range(0, len(tag_list)):
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try:
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val = readFromPLC(tag_list[i]['ip_address'], tag_list[i]['tag'])[0]
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now = time.time()
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store_value = abs(val - tag_list[i]['last_stored']) > tag_list[i]['change_threshold']
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store_time = (now - tag_list[i]['last_store_time']) > tag_list[i]['guarantee_sec']
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if store_value or store_time or (save_all == "true"):
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store_reason = ""
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if store_time:
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store_reason = "time delta = {} > {}".format(now - tag_list[i]['last_store_time'], tag_list[i]['guarantee_sec'])
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elif store_value:
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store_reason = "value delta = {} > {}".format(abs(val - tag_list[i]['last_stored']), tag_list[i]['change_threshold'])
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elif save_all == "true":
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store_reason = "save all parameter"
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tag_list[i]['last_stored'] = val
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tag_list[i]['last_store_time'] = now
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store_tag(tag_list[i])
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print("Stored {} for {} at {} due to {}".format(val, tag_list[i]['name'], now, store_reason))
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except CommError:
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print("CommError: Error connecting to {} for {}".format(tag_list[i]['ip_address'], tag_list[i]['name']))
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traceback.print_exc()
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except TypeError:
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print("Error reading {}".format(tag_list[i]['name']))
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else:
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print("No tags in tag_list. Trying again in 10 seconds.")
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time.sleep(10)
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main()
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# if plc_handshake_tags:
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# if time.time() - last_handshake_time > 30.0:
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# for hs_tag in plc_handshake_tags:
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# plc_handshake_tags[hs_tag].write(1)
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# print("Handshake with {} - {}".format(plc_handshake_tags[hs_tag].address, hs_tag))
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# last_handshake_time = time.time()
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time.sleep(scan_rate)
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if __name__ == '__main__':
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main()
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