Initial commit

data_points.py

@@ -0,0 +1,119 @@
+from datetime import datetime
+import time
+import minimalmodbus
+from pycomm.ab_comm.clx import Driver as clx
+from pycomm.cip.cip_base import CommError, DataError
+
+class DataPoint(object):
+    def __init__(self,changeThreshold=0,guaranteed=3600, name="datapoint",alertThreshold=[],alertCondition=[],alertResponse=[],alertContact=[]):
+        self.value = None
+        self.lastvalue = None
+        self.lastsend = 0
+        self.changeThreshold = changeThreshold
+        self.guaranteed = guaranteed
+        self.name = name
+        self.alerted = False
+        self.alertThreshold = alertThreshold
+        self.alertCondition = alertCondition
+        self.alertResponse = alertResponse
+        self.alertContact = alertContact
+
+    
+    def checkSend(self,value):
+        if value != self.lastvalue or (time.time() - self.lastsend > self.guaranteed):
+            self.lastsend = time.time()
+            self.lastvalue = value
+            return True
+        else:
+            return False
+    
+    def checkAlert(self,value):
+        conditions = {
+            "gt": "value > threshold",
+            "lt": "value < threshold",
+            "eq": "value == threshold",
+            "gte": "value >= threshold",
+            "lte": "value <= threshold",
+            "not": "value != threshold"
+        }
+        
+        for thres,cond in zip(self.alertThreshold,self.alertCondition):
+            #check value for alert threshold 
+            evalVars = {
+            "value": value,
+            "threshold": thres
+            }
+            func = conditions.get(cond)
+            if func == None:
+                print("Not an available function: {}".format(cond))
+            else:
+                if eval(func, evalVars):
+                    return {"message":"Read value for {} is {} threshold value {}".format(self.name,value,thres)}
+                else:
+                    self.alerted = False
+                    return None
+
+
+class modbusDataPoint(DataPoint):
+    def __init__(self,changeThreshold,guaranteed,name,register=1,baud=19200,stopBits=1,parity=None, device='/dev/ttyS0'):
+        DataPoint.__init__(self,changeThreshold,guaranteed,name)
+        self.register = register
+        self.baud = baud
+        self.stopBits = stopBits
+        self.parity = parity
+        self.device = device
+    def read(self):
+        pass
+
+    def write(self):
+        pass
+
+class plcDataPoint(DataPoint):
+    def __init__(self,changeThreshold,guaranteed,name,plcIP='192.168.1.10',plcType='Micro800',tag=None,alertThreshold=[],alertCondition=[],alertResponse=[],alertContact=[]):
+        DataPoint.__init__(self,changeThreshold,guaranteed,name,alertThreshold,alertCondition,alertResponse,alertContact)
+        self.plcIP = plcIP
+        self.plcType = plcType
+        self.tag = tag
+        
+    def read(self):
+        direct_connect =  self.plcType == "Micro800" 
+        c = clx()
+        try:
+            if c.open(self.plcIP,direct_connect):
+                try:
+                    val = c.read_tag(self.tag)
+                    c.close()
+                    alertMessage = self.checkAlert(val[0])
+                    return val[0], alertMessage
+                except DataError as derr:
+                    print("Error: {}".format(derr))
+                    c.close()
+        except CommError as cerr:
+            print("Error: {}".format(cerr))
+
+        return False
+        
+    def write(self):
+        pass
+
+class currentDataPoint(DataPoint):
+    def __init__(self,changeThreshold,guaranteed,name, euMin=0, euMax=100, rawMin=4, rawMax=20):
+        DataPoint.__init__(self,changeThreshold,guaranteed,name)
+        self.euMin = euMin
+        self.euMax = euMax
+        self.rawMin = rawMin
+        self.rawMax = rawMax
+
+    def read(self):
+        pass
+
+class voltageDataPoint(DataPoint):
+    def __init__(self,changeThreshold,guaranteed,name, euMin=0, euMax=100, rawMin=0, rawMax=10):
+        DataPoint.__init__(self,changeThreshold,guaranteed,name)
+        self.euMin = euMin
+        self.euMax = euMax
+        self.rawMin = rawMin
+        self.rawMax = rawMax
+
+    def read(self):
+        pass