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#!/usr/bin/env python3
#
# Simple pyprofibus example
#
# This example initializes an ET-200S slave, reads input
# data and writes the data back to the module.
#
# The hardware configuration is as follows:
#
# v--------------v----------v----------v----------v----------v
# | IM 151-1 | PM-E | 2 DO | 2 DO | 4 DI |
# | STANDARD | DC24V | DC24V/2A | DC24V/2A | DC24V |
# | | | | | |
# | | | | | |
# | ET 200S | | | | |
# | | | | | |
# | | | | | |
# | 6ES7 | 6ES7 | 6ES7 | 6ES7 | 6ES7 |
# | 151- | 138- | 132- | 132- | 131- |
# | 1AA04- | 4CA01- | 4BB30- | 4BB30- | 4BD01- |
# | 0AB0 | 0AA0 | 0AA0 | 0AA0 | 0AA0 |
# ^--------------^----------^----------^----------^----------^
#
import pyprofibus
import pyprofibus.phy_serial
from pyprofibus.gsd.interp import GsdInterp
from pyprofibus.dp import DpTelegram_SetPrm_Req
# The serial port that we connect to
port = "/dev/ttyAMA0"
# Enable verbose debug messages?
debug = True
# Parse the GSD file.
# And select the plugged modules.
gsd = GsdInterp.fromFile("si03806a.gse", debug = False)
gsd.setConfiguredModule("6ES7 138-4CA01-0AA0 PM-E DC24V")
gsd.setConfiguredModule("6ES7 132-4BB30-0AA0 2DO DC24V")
gsd.setConfiguredModule("6ES7 132-4BB30-0AA0 2DO DC24V")
gsd.setConfiguredModule("6ES7 131-4BD01-0AA0 4DI DC24V")
# Create a PHY (layer 1) interface object
phy = pyprofibus.phy_serial.CpPhySerial(port = port,
debug = debug)
phy.setConfig(19200)
# Create a DP class 1 master with DP address 1
master = pyprofibus.DPM1(phy = phy,
masterAddr = 2,
debug = debug)
# Create a slave description for an ET-200S.
# The ET-200S has got the DP address 8 set via DIP-switches.
et200s = pyprofibus.DpSlaveDesc(identNumber = gsd.getIdentNumber(),
slaveAddr = 8)
# Create Chk_Cfg telegram
et200s.setCfgDataElements(gsd.getCfgDataElements())
# Set User_Prm_Data
dp1PrmMask = bytearray((DpTelegram_SetPrm_Req.DPV1PRM0_FAILSAFE,
DpTelegram_SetPrm_Req.DPV1PRM1_REDCFG,
0x00))
dp1PrmSet = bytearray((DpTelegram_SetPrm_Req.DPV1PRM0_FAILSAFE,
DpTelegram_SetPrm_Req.DPV1PRM1_REDCFG,
0x00))
et200s.setUserPrmData(gsd.getUserPrmData(dp1PrmMask = dp1PrmMask,
dp1PrmSet = dp1PrmSet))
# Set various standard parameters
et200s.setSyncMode(True) # Sync-mode supported
et200s.setFreezeMode(True) # Freeze-mode supported
et200s.setGroupMask(1) # Group-ident 1
et200s.setWatchdog(300) # Watchdog: 300 ms
# Register the ET-200S slave at the DPM
master.addSlave(et200s)
try:
# Initialize the DPM and all registered slaves
master.initialize()
# Cyclically run Data_Exchange.
# 4 input bits from the 4-DI module are copied to
# the two 2-DO modules.
inData = 0
while 1:
outData = [inData & 3, (inData >> 2) & 3]
inDataTmp = master.runSlave(et200s, outData)
if inDataTmp is not None:
inData = inDataTmp[0]
except Exception as e:
print("Terminating: %s" % str(e))
master.destroy()
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