import snap7.client as c
from snap7.util import *
from snap7.snap7types import *
def ReadMemory(plc,byte,bit,datatype):
result = plc.read_area(areas['MK'],0,byte,datatype)
if datatype==S7WLBit:
return get_bool(result,0,bit)
elif datatype==S7WLByte or datatype==S7WLWord:
return get_int(result,0)
elif datatype==S7WLReal:
return get_real(result,0)
elif datatype==S7WLDWord:
return get_dword(result,0)
else:
return None
def WriteMemory(plc,byte,bit,datatype,value):
result = plc.read_area(areas['MK'],0,byte,datatype)
if datatype==S7WLBit:
set_bool(result,0,bit,value)
elif datatype==S7WLByte or datatype==S7WLWord:
set_int(result,0,value)
elif datatype==S7WLReal:
set_real(result,0,value)
elif datatype==S7WLDWord:
set_dword(result,0,value)
plc.write_area(areas["MK"],0,byte,result)
if __name__=="__main__":
plc = c.Client()
plc.connect('10.10.54.2',0,1)
print ReadMemory(plc,420,0,S7WLReal)
WriteMemory(plc,420,0,S7WLReal,3.141592)
print ReadMemory(plc,420,0,S7WLReal)
#DONE!!
Wednesday, February 3, 2016
Python Snap7 S7-1200 Simple Reading/Writing Memory Example
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hello
ReplyDeletecan you help me in this problem " snap7.snap7exceptions.Snap7Exception: b' ISO : An error occurred during recv TCP : Connection timed out' " , please ?
Hi. I've followed your video and copy-pasted the program. I even went and created the same variables at the same adresses you use, but I get a "Function refused by CPU" error. I'm able to connect to the PLC, but I can't neither read nor write. Can you help?
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Deletecan we tag name instead of memory address
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Hi, thanks to your help I'm able to connect to a S7 1200PLC. I have some DInt value. How can I read it in the coorect value?
ReplyDeleteThanks
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ReplyDeleteValue 0xffff (all 16 bits set to one) cannot be processed with get_int or set_int
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