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# -*- coding: utf-8 -*-
#
# AWL simulator - SFBs
#
# Copyright 2014 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.compat import *
from awlsim.core.systemblocks.systemblocks import *
from awlsim.core.util import *
class SFB2(SFB):
name = (2, "CTUD", "IEC 1131-3 up/down counter")
interfaceFields = {
BlockInterfaceField.FTYPE_IN : (
BlockInterfaceField(name = "CU",
dataType = AwlDataType.makeByName("BOOL")),
BlockInterfaceField(name = "CD",
dataType = AwlDataType.makeByName("BOOL")),
BlockInterfaceField(name = "R",
dataType = AwlDataType.makeByName("BOOL")),
BlockInterfaceField(name = "LOAD",
dataType = AwlDataType.makeByName("BOOL")),
BlockInterfaceField(name = "PV",
dataType = AwlDataType.makeByName("INT")),
),
BlockInterfaceField.FTYPE_OUT : (
BlockInterfaceField(name = "QU",
dataType = AwlDataType.makeByName("BOOL")),
BlockInterfaceField(name = "QD",
dataType = AwlDataType.makeByName("BOOL")),
BlockInterfaceField(name = "CV",
dataType = AwlDataType.makeByName("INT")),
),
BlockInterfaceField.FTYPE_STAT : (
BlockInterfaceField(name = "CUO",
dataType = AwlDataType.makeByName("BOOL")),
BlockInterfaceField(name = "CDO",
dataType = AwlDataType.makeByName("BOOL")),
),
}
def run(self):
# CU pos-edge detection
CU = self.fetchInterfaceFieldByName("CU")
CU_pos_edge = CU & ~self.fetchInterfaceFieldByName("CUO") & 1
self.storeInterfaceFieldByName("CUO", CU)
# CD pos-edge detection
CD = self.fetchInterfaceFieldByName("CD")
CD_pos_edge = CD & ~self.fetchInterfaceFieldByName("CDO") & 1
self.storeInterfaceFieldByName("CDO", CD)
# Count
PV = wordToSignedPyInt(self.fetchInterfaceFieldByName("PV"))
CV = wordToSignedPyInt(self.fetchInterfaceFieldByName("CV"))
if self.fetchInterfaceFieldByName("R"): # Counter reset
CV = 0
self.storeInterfaceFieldByName("CV", CV)
elif self.fetchInterfaceFieldByName("LOAD"): # Counter load
CV = PV
self.storeInterfaceFieldByName("CV", CV)
elif CD_pos_edge and not CU_pos_edge and CV > -32768: # Count down
CV -= 1
self.storeInterfaceFieldByName("CV", CV)
elif CU_pos_edge and not CD_pos_edge and CV < 32767: # Count up
CV += 1
self.storeInterfaceFieldByName("CV", CV)
# Update Q-status
self.storeInterfaceFieldByName("QU", 1 if CV >= PV else 0)
self.storeInterfaceFieldByName("QD", 1 if CV <= 0 else 0)
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