212 lines
7.7 KiB
Python
212 lines
7.7 KiB
Python
"""Define Meshify channel class."""
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from pycomm.ab_comm.clx import Driver as ClxDriver
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from pycomm.cip.cip_base import CommError, DataError
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import time
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def binarray(intval):
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"""Split an integer into its bits."""
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bin_string = '{0:08b}'.format(intval)
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bin_arr = [i for i in bin_string]
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bin_arr.reverse()
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return bin_arr
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def read_tag(addr, tag):
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"""Read a tag from the PLC."""
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c = ClxDriver()
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try:
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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 DataError:
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c.close()
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print("Data Error during readTag({}, {})".format(addr, tag))
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except CommError:
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# err = c.get_status()
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c.close()
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print("Could not connect during readTag({}, {})".format(addr, tag))
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# print err
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except AttributeError as e:
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c.close()
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print("AttributeError during readTag({}, {}): \n{}".format(addr, tag, e))
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c.close()
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return False
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def read_array(addr, tag, start, end):
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"""Read an array from the PLC."""
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c = ClxDriver()
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if c.open(addr):
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arr_vals = []
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try:
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for i in range(start, end):
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tag_w_index = tag + "[{}]".format(i)
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v = c.read_tag(tag_w_index)
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# print('{} - {}'.format(tag_w_index, v))
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arr_vals.append(round(v[0], 4))
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# print(v)
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if len(arr_vals) > 0:
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return arr_vals
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else:
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print("No length for {}".format(addr))
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return False
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except Exception:
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print("Error during readArray({}, {}, {}, {})".format(addr, tag, start, end))
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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 write_tag(addr, tag, val):
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"""Write a tag value to the PLC."""
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c = ClxDriver()
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if c.open(addr):
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try:
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cv = c.read_tag(tag)
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wt = c.write_tag(tag, val, cv[1])
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return wt
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except Exception:
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print("Error during writeTag({}, {}, {})".format(addr, tag, val))
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err = c.get_status()
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c.close()
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print err
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c.close()
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class Channel:
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"""Holds the configuration for a Meshify channel."""
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def __init__(self, ip, mesh_name, plc_tag, data_type, chg_threshold, guarantee_sec, map_=False, write_enabled=False):
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"""Initialize the channel."""
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self.plc_ip = ip
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self.mesh_name = mesh_name
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self.plc_tag = plc_tag
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self.data_type = data_type
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self.last_value = None
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self.value = None
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self.last_send_time = 0
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self.chg_threshold = chg_threshold
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self.guarantee_sec = guarantee_sec
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self.map_ = map_
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self.write_enabled = write_enabled
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def __str__(self):
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"""Create a string for the channel."""
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return "{}: {}\nvalue: {}, last_send_time: {}".format(self.mesh_name, self.plc_tag, self.value, self.last_send_time)
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def read(self, force_send=False):
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"""Read the value and check to see if needs to be stored."""
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send_needed = False
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send_reason = ""
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if self.plc_tag:
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v = read_tag(self.plc_ip, self.plc_tag)
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if v:
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if self.data_type == 'BOOL' or self.data_type == 'STRING':
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if self.last_send_time == 0:
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send_needed = True
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send_reason = "no send time"
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elif self.value is None:
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send_needed = True
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send_reason = "no value"
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elif not (self.value == v[0]):
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if self.map_:
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if not self.value == self.map_[v[0]]:
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send_needed = True
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send_reason = "value change"
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else:
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send_needed = True
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send_reason = "value change"
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elif (time.time() - self.last_send_time) > self.guarantee_sec:
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send_needed = True
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send_reason = "guarantee sec"
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elif force_send:
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send_needed = True
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send_reason = "forced"
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else:
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if self.last_send_time == 0:
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send_needed = True
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send_reason = "no send time"
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elif self.value is None:
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send_needed = True
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send_reason = "no value"
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elif abs(self.value - v[0]) > self.chg_threshold:
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send_needed = True
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send_reason = "change threshold"
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elif (time.time() - self.last_send_time) > self.guarantee_sec:
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send_needed = True
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send_reason = "guarantee sec"
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elif force_send:
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send_needed = True
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send_reason = "forced"
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if send_needed:
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self.last_value = self.value
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if self.map_:
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try:
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self.value = self.map_[v[0]]
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except KeyError:
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print("Cannot find a map value for {} in {} for {}".format(v[0], self.map_, self.mesh_name))
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self.value = v[0]
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else:
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self.value = v[0]
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self.last_send_time = time.time()
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print("Sending {} for {} - {}".format(self.value, self.mesh_name, send_reason))
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return send_needed
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class BoolArrayChannels(Channel):
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"""Hold the configuration for a set of boolean array channels."""
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def compare_values(self, new_val_dict):
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"""Compare new values to old values to see if the values need storing."""
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send = False
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for idx in new_val_dict:
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try:
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if new_val_dict[idx] != self.last_value[idx]:
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send = True
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except KeyError:
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print("Key Error in self.compare_values for index {}".format(idx))
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send = True
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return send
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def read(self, force_send=False):
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"""Read the value and check to see if needs to be stored."""
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send_needed = False
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send_reason = ""
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if self.plc_tag:
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v = read_tag(self.plc_ip, self.plc_tag)
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if v:
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bool_arr = binarray(v[0])
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new_val = {}
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for idx in self.map_:
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try:
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new_val[self.map_[idx]] = bool_arr[idx]
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except KeyError:
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print("Not able to get value for index {}".format(idx))
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if self.last_send_time == 0:
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send_needed = True
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send_reason = "no send time"
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elif self.value is None:
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send_needed = True
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send_reason = "no value"
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elif self.compare_values(new_val):
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send_needed = True
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send_reason = "value change"
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elif (time.time() - self.last_send_time) > self.guarantee_sec:
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send_needed = True
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send_reason = "guarantee sec"
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elif force_send:
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send_needed = True
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send_reason = "forced"
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if send_needed:
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self.value = new_val
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self.last_value = self.value
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self.last_send_time = time.time()
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print("Sending {} for {} - {}".format(self.value, self.mesh_name, send_reason))
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return send_needed
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