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#!/usr/bin/env python3
#
# Simple pyprofibus example
#
# This example initializes an S7-315-2DP configured as slave,
# reads its input data and writes the data back to the module.
#
import pyprofibus
def main(watchdog=None):
master = None
try:
# Parse the config file.
config = pyprofibus.PbConf.fromFile("example_s7_315_2dp.conf")
# Create a DP master.
master = config.makeDPM()
# Create the slave descriptions.
outData = {}
for slaveConf in config.slaveConfs:
slaveDesc = slaveConf.makeDpSlaveDesc()
# Register the S7-315-2DP slave at the DPM
master.addSlave(slaveDesc)
# Set initial output data.
outData[slaveDesc.slaveAddr] = bytearray((0x00, ))
# Initialize the DPM
master.initialize()
# Cyclically run Data_Exchange.
while True:
# Write the output data.
for slaveDesc in master.getSlaveList():
slaveDesc.setOutData(outData[slaveDesc.slaveAddr])
# Run slave state machines.
handledSlaveDesc = master.run()
# Get the in-data (receive) and set it as out-data (transmit).
if handledSlaveDesc:
inData = handledSlaveDesc.getInData()
if inData is not None:
# In our example the output data shall be a mirror of the input.
outData[handledSlaveDesc.slaveAddr] = inData
# Feed the system watchdog, if it is available.
if watchdog is not None:
watchdog()
except pyprofibus.ProfibusError as e:
print("Terminating: %s" % str(e))
return 1
finally:
if master:
master.destroy()
return 0
if __name__ == "__main__":
import sys
sys.exit(main())
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