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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 sys
import pyprofibus
from pyprofibus import DpTelegram_SetPrm_Req, monotonic_time
master = None
try:
# Parse the config file.
config = pyprofibus.PbConf.fromFile("example_s7-315-2dp.conf")
# Create a PHY (layer 1) interface object
phy = config.makePhy()
# Create a DP class 1 master with DP address 1
master = pyprofibus.DPM1(phy = phy,
masterAddr = config.dpMasterAddr,
debug = True)
outData = {}
# Create a slave descriptions.
for slaveConf in config.slaveConfs:
gsd = slaveConf.gsd
# Create a slave description for an S7-315-2DP
slaveDesc = pyprofibus.DpSlaveDesc(identNumber = gsd.getIdentNumber(),
slaveAddr = slaveConf.addr)
# Create Chk_Cfg telegram
slaveDesc.setCfgDataElements(gsd.getCfgDataElements())
# Set User_Prm_Data
slaveDesc.setUserPrmData(gsd.getUserPrmData())
# Set various standard parameters
slaveDesc.setSyncMode(slaveConf.syncMode)
slaveDesc.setFreezeMode(slaveConf.freezeMode)
slaveDesc.setGroupMask(slaveConf.groupMask)
slaveDesc.setWatchdog(slaveConf.watchdogMs)
# 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
except pyprofibus.ProfibusError as e:
print("Terminating: %s" % str(e))
finally:
if master:
master.destroy()
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