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# -*- coding: utf-8 -*-
#
# AWL simulator - SFBs
#
# Copyright 2014-2018 Michael Buesch <m@bues.ch>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
from __future__ import division, absolute_import, print_function, unicode_literals
#from awlsim.common.cython_support cimport * #@cy
from awlsim.common.compat import *
from awlsim.common.datatypehelpers import * #+cimport
from awlsim.common.exceptions import *
from awlsim.common.util import *
from awlsim.core.systemblocks.systemblocks import * #+cimport
from awlsim.core.blockinterface import *
from awlsim.core.datatypes import *
class SFB5(SFB): #+cdef
name = (5, "TOF", "IEC 1131-3 delayed reset")
interfaceFields = {
BlockInterfaceField.FTYPE_IN : (
BlockInterfaceField(name="IN", dataType="BOOL"),
BlockInterfaceField(name="PT", dataType="TIME"),
),
BlockInterfaceField.FTYPE_OUT : (
BlockInterfaceField(name="Q", dataType="BOOL"),
BlockInterfaceField(name="ET", dataType="TIME"),
),
BlockInterfaceField.FTYPE_STAT : (
BlockInterfaceField(name="STATE", dataType="BYTE"),
BlockInterfaceField(name="STIME", dataType="TIME"),
BlockInterfaceField(name="ATIME", dataType="TIME"),
),
}
# STATE bits
STATE_PREV_IN = 1 << 0
STATE_DELAYING = 1 << 1
def run(self): #+cpdef
#@cy cdef S7StatusWord s
s = self.cpu.statusWord
s.BIE = 1
PT = dwordToSignedPyInt(AwlMemoryObject_asScalar(
self.fetchInterfaceFieldByName("PT")))
if PT <= 0:
# Invalid PT. Abort and reset state.
# A PT of zero is used to reset the timer.
if PT == 0:
# S7 resets IN here, for whatever weird reason.
self.storeInterfaceFieldByName("IN",
make_AwlMemoryObject_fromScalar(0, 1))
else:
# Negative PT. This is an error.
s.BIE = 0
self.storeInterfaceFieldByName("Q",
make_AwlMemoryObject_fromScalar(0, 1))
self.storeInterfaceFieldByName("ET",
make_AwlMemoryObject_fromScalar(0, 32))
self.storeInterfaceFieldByName("STATE",
make_AwlMemoryObject_fromScalar(0, 8))
return
# Get the current time, as S7-time value (31-bit milliseconds)
ATIME = self.cpu.now_TIME
STATE = AwlMemoryObject_asScalar(self.fetchInterfaceFieldByName("STATE"))
IN = AwlMemoryObject_asScalar(self.fetchInterfaceFieldByName("IN"))
if IN:
# IN is 1.
# This sets Q=1 and interrupts any running state.
STATE &= ~self.STATE_DELAYING
STATE |= self.STATE_PREV_IN
self.storeInterfaceFieldByName("STATE",
make_AwlMemoryObject_fromScalar(STATE, 8))
self.storeInterfaceFieldByName("ET",
make_AwlMemoryObject_fromScalar(0, 32))
self.storeInterfaceFieldByName("Q",
make_AwlMemoryObject_fromScalar(1, 1))
else:
if STATE & self.STATE_PREV_IN:
# Negative edge on IN.
# This starts the delay. Q will stay 1.
self.storeInterfaceFieldByName("STIME",
make_AwlMemoryObject_fromScalar(ATIME, 32))
STATE |= self.STATE_DELAYING
STATE &= ~self.STATE_PREV_IN
self.storeInterfaceFieldByName("STATE",
make_AwlMemoryObject_fromScalar(STATE, 8))
if STATE & self.STATE_DELAYING:
# The delay is running.
STIME = AwlMemoryObject_asScalar(
self.fetchInterfaceFieldByName("STIME"))
self.storeInterfaceFieldByName("ATIME",
make_AwlMemoryObject_fromScalar(ATIME, 32))
ET = (ATIME - STIME) & 0x7FFFFFFF
if ET >= PT:
# Time elapsed. Reset Q.
ET = PT
self.storeInterfaceFieldByName("Q",
make_AwlMemoryObject_fromScalar(0, 1))
STATE &= ~self.STATE_DELAYING
self.storeInterfaceFieldByName("STATE",
make_AwlMemoryObject_fromScalar(STATE, 8))
else:
self.storeInterfaceFieldByName("Q",
make_AwlMemoryObject_fromScalar(1, 1))
self.storeInterfaceFieldByName("ET",
make_AwlMemoryObject_fromScalar(ET, 32))
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