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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 SFB1(SFB): #+cdef
name = (1, "CTD", "IEC 1131-3 down counter")
interfaceFields = {
BlockInterfaceField.FTYPE_IN : (
BlockInterfaceField(name="CD", dataType="BOOL"),
BlockInterfaceField(name="LOAD", dataType="BOOL"),
BlockInterfaceField(name="PV", dataType="INT"),
),
BlockInterfaceField.FTYPE_OUT : (
BlockInterfaceField(name="Q", dataType="BOOL"),
BlockInterfaceField(name="CV", dataType="INT"),
),
BlockInterfaceField.FTYPE_STAT : (
BlockInterfaceField(name="CDO", dataType="BOOL"),
),
}
def run(self): #+cpdef
#@cy cdef S7StatusWord s
s = self.cpu.statusWord
# CD pos-edge detection
CD = AwlMemoryObject_asScalar(self.fetchInterfaceFieldByName("CD"))
CD_pos_edge = CD & (AwlMemoryObject_asScalar(
self.fetchInterfaceFieldByName("CDO")) ^ 1) & 1
self.storeInterfaceFieldByName("CDO", make_AwlMemoryObject_fromScalar(CD, 1))
CV = wordToSignedPyInt(AwlMemoryObject_asScalar(
self.fetchInterfaceFieldByName("CV")))
if AwlMemoryObject_asScalar(self.fetchInterfaceFieldByName("LOAD")): # Counter load
CV = wordToSignedPyInt(AwlMemoryObject_asScalar(
self.fetchInterfaceFieldByName("PV")))
self.storeInterfaceFieldByName("CV",
make_AwlMemoryObject_fromScalar(CV, 16))
elif CD_pos_edge and CV > -32768: # Count down
CV -= 1
self.storeInterfaceFieldByName("CV",
make_AwlMemoryObject_fromScalar(CV, 16))
# Update Q-status
self.storeInterfaceFieldByName("Q",
make_AwlMemoryObject_fromScalar(1 if CV <= 0 else 0, 1))
s.BIE = 1
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