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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 SFB3(SFB):
name = (3, "TP", "IEC 1131-3 timed pulse")
interfaceFields = {
BlockInterfaceField.FTYPE_IN : (
BlockInterfaceField(name = "IN",
dataType = AwlDataType.makeByName("BOOL")),
BlockInterfaceField(name = "PT",
dataType = AwlDataType.makeByName("TIME")),
),
BlockInterfaceField.FTYPE_OUT : (
BlockInterfaceField(name = "Q",
dataType = AwlDataType.makeByName("BOOL")),
BlockInterfaceField(name = "ET",
dataType = AwlDataType.makeByName("TIME")),
),
BlockInterfaceField.FTYPE_STAT : (
BlockInterfaceField(name = "STATE",
dataType = AwlDataType.makeByName("BYTE")),
BlockInterfaceField(name = "STIME",
dataType = AwlDataType.makeByName("TIME")),
BlockInterfaceField(name = "ATIME",
dataType = AwlDataType.makeByName("TIME")),
),
}
# STATE bits
STATE_RUNNING = 1 << 0
STATE_FINISHED = 1 << 1
def run(self):
PT = dwordToSignedPyInt(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", 0)
self.storeInterfaceFieldByName("Q", 0)
self.storeInterfaceFieldByName("ET", 0)
self.storeInterfaceFieldByName("STATE", 0)
return
# Get the current time, as S7-time value (31-bit milliseconds)
ATIME = int(self.cpu.now * 1000.0) & 0x7FFFFFFF
STATE = self.fetchInterfaceFieldByName("STATE")
IN = self.fetchInterfaceFieldByName("IN")
if IN and not (STATE & (self.STATE_RUNNING | self.STATE_FINISHED)):
# IN is true and we are not running, yet.
# Start the timer.
self.storeInterfaceFieldByName("STIME", ATIME)
STATE |= self.STATE_RUNNING
self.storeInterfaceFieldByName("STATE", STATE)
if STATE & self.STATE_RUNNING:
# The timer is running.
STIME = self.fetchInterfaceFieldByName("STIME")
self.storeInterfaceFieldByName("ATIME", ATIME)
ET = (ATIME - STIME) & 0x7FFFFFFF
if ET >= PT:
# Time elapsed.
ET = PT
self.storeInterfaceFieldByName("Q", 0)
STATE &= ~self.STATE_RUNNING
STATE |= self.STATE_FINISHED
self.storeInterfaceFieldByName("STATE", STATE)
else:
self.storeInterfaceFieldByName("Q", 1)
self.storeInterfaceFieldByName("ET", ET)
if not IN and (STATE & self.STATE_FINISHED):
# IN is false and we are finished.
# Shut down the timer.
STATE &= ~self.STATE_FINISHED
self.storeInterfaceFieldByName("STATE", STATE)
self.storeInterfaceFieldByName("ET", 0)
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