121 lines
3.9 KiB
Python
121 lines
3.9 KiB
Python
from pycomm.ab_comm.clx import Driver as ClxDriver
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import sys
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import MySQLdb
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from time import sleep
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def closeEnough(a,b):
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return abs(a - b) <= 0.1
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def getPLCIP():
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db = MySQLdb.connect(host="127.0.0.1",user="website",passwd="henrypump",db="WellData")
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cur = db.cursor()
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query = "SELECT * FROM WellData.config ORDER BY dateChanged DESC LIMIT 1;"
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cur.execute(query)
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setup = cur.fetchall()
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db.commit()
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db.close()
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return setup[0][2]
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def readTag(tagName):
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PLC_IP_ADDRESS = getPLCIP()
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c = ClxDriver(True, 'ClxDriver.log')
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def readString(tag):
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read_vals = c.read_array(tag, 82)
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string = filter(lambda b: b != "",map(lambda a: chr(a[1]),read_vals))
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return "".join(string)
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if c.open(PLC_IP_ADDRESS):
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out = {}
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try:
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result = c.read_tag([tagName])
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if result[0][2] == None:
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raise ValueError('Tag not found')
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out['status'] = "success"
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out['value'] = result[0][1]
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out['type'] = result[0][2]
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except Exception, e:
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out['status'] = "error"
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out['message'] = "Tag Not Found"
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c.close()
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return out
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def main(tag, value):
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r = 0
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PLC_IP_ADDRESS = getPLCIP()
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readObj = readTag(tag)
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if readObj['status'] == "error":
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return readObj
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elif readObj['status'] == 'success':
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tagType = readObj['type']
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if tagType[:-3] == "INT" or tagType == "BOOL":
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value = int(value)
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elif tagType == "REAL":
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value = float(value)
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c = ClxDriver(True, 'ClxDriver.log')
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if c.open(PLC_IP_ADDRESS):
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r = c.write_tag(tag, value, tagType)
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else:
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return {"status": 'error', "message": "not connected to PLC"}
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c.close()
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sleep(2)
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return readTag(tag)
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def writeTagAndVerify(tag,value, sleepValue=2):
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"""Writes the specified value to tag and confirms that the value has been set"""
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r = 0
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PLC_IP_ADDRESS = getPLCIP()
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readObj = readTag(tag)
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if readObj['status'] == "error":
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return readObj
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elif readObj['status'] == 'success':
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tagType = readObj['type']
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prevValue = readObj['value']
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if tagType[:-3] == "INT" or tagType == "BOOL":
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value = int(value)
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elif tagType == "REAL":
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value = float(value)
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c = ClxDriver(True, 'ClxDriver.log')
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if c.open(PLC_IP_ADDRESS):
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r = c.write_tag(tag, value, tagType)
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sleep(float(sleepValue))
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newObj = readTag(tag)
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if newObj['status'] == "error":
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return newObj
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elif newObj['status'] == 'success':
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newTagType = newObj['type']
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newValue = newObj['value']
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if (newTagType == tagType):
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if (closeEnough(newValue, value)):
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return {'status':'success', 'value':newValue, 'type':newTagType, 'verified':'true','prevValue':prevValue}
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else:
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return {"status": 'error', "message": "The tag value does not match the specified value", "value":newValue}
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else:
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return {"status": 'error', "message": "Somehow the tag type has changed"}
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else:
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return {"status": 'error', "message": "not connected to PLC"}
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c.close()
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def toggle(tag, toggleVal, timeToggled=2):
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val = int(toggleVal)
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set_tag = writeTagAndVerify(tag,toggleVal,sleepValue=1)
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if set_tag['status']== 'success':
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sleep(timeToggled)
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reset_tag = writeTagAndVerify(tag, set_tag['prevValue'],sleepValue=1)
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if reset_tag['status'] == "success":
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return {'status':'success'}
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else:
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return {'status':'error', 'message':reset_tag['message']}
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else:
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return {'status':'error', 'message':set_tag['message']}
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if __name__ == '__main__':
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print main(sys.argv[1], sys.argv[2])
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