64 lines
2.5 KiB
Python
64 lines
2.5 KiB
Python
# *****************************************************************************
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# This program is free software; you can redistribute it and/or modify it under
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# the terms of the GNU General Public License as published by the Free Software
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# Foundation; either version 2 of the License, or (at your option) any later
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# version.
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#
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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# details.
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#
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# You should have received a copy of the GNU General Public License along with
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# this program; if not, write to the Free Software Foundation, Inc.,
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# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# Module authors:
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# Markus Zolliker <markus.zolliker@psi.ch>
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# *****************************************************************************
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"""interlocks for furnance"""
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import time
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from frappy.core import Module, Writable, Attached, Parameter, FloatRange, Readable,\
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BoolType, ERROR, IDLE
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from frappy_psi.picontrol import PImixin
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class Interlocks(Module):
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input = Attached(Readable, 'the input module')
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vacuum = Attached (Readable, 'the vacuum pressure')
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wall_T = Attached (Readable, 'the wall temperature')
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control = Attached(Module, 'the control module')
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relais = Attached(Writable, 'the interlock relais')
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wall_limit = Parameter('maximum wall temperature', FloatRange(0, unit='degC'),
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default = 50, readonly = False)
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vacuum_limit = Parameter('maximum vacuum pressure', FloatRange(0, unit='mbar'),
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default = 0.1, readonly = False)
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def doPoll(self):
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super().doPoll()
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if self.input.status[0] >= ERROR:
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self.control.status = self.input.status
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elif self.vacuum.value > self.vacuum_limit:
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self.control.status = ERROR, 'bad vacuum'
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elif self.wall_T.value > self.wall_limit:
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self.control.status = ERROR, 'wall overheat'
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else:
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return
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self.control.write_control_active(False)
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self.relais.write_target(False)
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class PI(PImixin, Writable):
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input = Attached(Readable, 'the input module')
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relais = Attached(Writable, 'the interlock relais', mandatory=False)
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def read_value(self):
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return self.input.value
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def write_target(self, value):
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super().write_target(value)
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if self.relais:
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self.relais.write_target(1)
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