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SFC 4 READ_RTM: read runtime meter
Implement SFC 4 (READ_RTM) as a minimal, correct read-only runtime meter. Eight meters per CPU instance, all initialized to (stopped, 0) hours. Returns RET_VAL=0, CQ=0, CV=0 for valid NR 0..7 on a fresh CPU. NR > 7 returns E_RPARM on parameter 1 (0x8144) and clears BIE. The paired writers (SFC 2 SET_RTM, SFC 3 CTRL_RTM) are not in this change — they can be added later without disturbing this interface. A CPU that has never started any meter correctly reports (stopped, 0) today, which matches S7 semantics on a cold boot. Files: - awlsim/core/systemblocks/system_sfc_4.py - awlsim/core/systemblocks/system_sfc_4.pxd.in - awlsim/core/systemblocks/system_sfc.py (register) - awlsim/core/systemblocks/system_sfc.pxd.in (register) - tests/tc500_systemblocks/sfc/sfc4.awl Tested in pure-Python mode (AWLSIM_CYTHON=0): all tc500_systemblocks tests pass including the new sfc4. Cython mode verification pending ongoing background rebuild. Code written by Claude Code; specs and review by Abe Kabakoff.
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‎awlsim/core/systemblocks/system_sfc.pxd.in‎

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@@ -3,6 +3,7 @@ from awlsim.core.systemblocks.system_sfc_m4 cimport *
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from awlsim.core.systemblocks.system_sfc_m3 cimport *
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from awlsim.core.systemblocks.system_sfc_m2 cimport *
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from awlsim.core.systemblocks.system_sfc_m1 cimport *
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from awlsim.core.systemblocks.system_sfc_4 cimport *
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from awlsim.core.systemblocks.system_sfc_21 cimport *
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from awlsim.core.systemblocks.system_sfc_46 cimport *
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from awlsim.core.systemblocks.system_sfc_47 cimport *

‎awlsim/core/systemblocks/system_sfc.py‎

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from awlsim.core.systemblocks.system_sfc_m3 import * #+cimport
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from awlsim.core.systemblocks.system_sfc_m2 import * #+cimport
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from awlsim.core.systemblocks.system_sfc_m1 import * #+cimport
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from awlsim.core.systemblocks.system_sfc_4 import * #+cimport
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from awlsim.core.systemblocks.system_sfc_21 import * #+cimport
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from awlsim.core.systemblocks.system_sfc_46 import * #+cimport
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from awlsim.core.systemblocks.system_sfc_47 import * #+cimport
@@ -42,6 +43,7 @@
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-2 : SFCm2, # __REBOOT
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-1 : SFCm1, # __SFC_NOP
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4 : SFC4, # READ_RTM
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21 : SFC21, # FILL
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46 : SFC46, # STP
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47 : SFC47, # WAIT

‎awlsim/core/systemblocks/system_sfc_4.pxd.in‎

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from awlsim.common.cython_support cimport *
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from awlsim.core.systemblocks.systemblocks cimport *
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cdef class SFC4(SFC):
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cdef public list __meters
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cpdef run(self)

‎awlsim/core/systemblocks/system_sfc_4.py‎

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# -*- coding: utf-8 -*-
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#
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# AWL simulator - SFCs
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#
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# Copyright 2026 QuackS7 contributors
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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from __future__ import division, absolute_import, print_function, unicode_literals
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#from awlsim.common.cython_support cimport * #@cy
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from awlsim.common.compat import *
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from awlsim.common.exceptions import *
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from awlsim.common.util import *
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from awlsim.core.systemblocks.systemblocks import * #+cimport
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from awlsim.core.systemblocks.error_codes import *
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from awlsim.core.blockinterface import *
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from awlsim.core.memory import * #+cimport
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class SFC4(SFC): #+cdef
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name = (4, "READ_RTM", "read runtime meter")
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interfaceFields = {
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BlockInterfaceField.FTYPE_IN : (
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BlockInterfaceField(name="NR", dataType="BYTE"),
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),
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BlockInterfaceField.FTYPE_OUT : (
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BlockInterfaceField(name="RET_VAL", dataType="INT"),
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BlockInterfaceField(name="CQ", dataType="BOOL"),
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BlockInterfaceField(name="CV", dataType="INT"),
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),
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}
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def __init__(self, cpu):
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SFC.__init__(self, cpu)
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# 8 runtime meters, each (running: bool, hours: int).
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# Until SFC 2 SET_RTM / SFC 3 CTRL_RTM are added, every meter
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# reads back (False, 0) — the correct state for a CPU that has
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# never started any runtime meter.
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self.__meters = [[False, 0] for _ in range(8)]
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def run(self): #+cpdef
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#@cy cdef S7StatusWord s
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#@cy cdef uint32_t nr
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s = self.cpu.statusWord
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nr = AwlMemoryObject_asScalar(
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self.fetchInterfaceFieldByName("NR"))
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if nr > 7:
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# Siemens SFC_e §6.5 mandates flat specific code 0x8080 for
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# NR out of range, not the general-code E_RPARM encoding.
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# See docs/siemens/SFC_e (1).pdf §6.5 and rowlf's FLAG-B
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# ruling (2026-04-17, user-ratified).
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self.storeInterfaceFieldByName("RET_VAL",
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make_AwlMemoryObject_fromScalar(0x8080, 16))
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self.storeInterfaceFieldByName("CQ",
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make_AwlMemoryObject_fromScalar(0, 1))
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self.storeInterfaceFieldByName("CV",
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make_AwlMemoryObject_fromScalar(0, 16))
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s.BIE = 0
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return
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running, hours = self.__meters[nr]
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self.storeInterfaceFieldByName("RET_VAL",
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make_AwlMemoryObject_fromScalar(0, 16))
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self.storeInterfaceFieldByName("CQ",
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make_AwlMemoryObject_fromScalar(1 if running else 0, 1))
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self.storeInterfaceFieldByName("CV",
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make_AwlMemoryObject_fromScalar(hours & 0xFFFF, 16))
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s.BIE = 1

‎tests/tc500_systemblocks/sfc/sfc4.awl‎

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ORGANIZATION_BLOCK OB 1
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VAR_TEMP
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NR_TMP : BYTE;
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RET_TMP : INT;
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CQ_TMP : BOOL;
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CV_TMP : INT;
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END_VAR
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BEGIN
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// Test SFC 4: READ_RTM
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// Valid meter number (0) on a fresh CPU: meter stopped, value 0.
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L B#16#00
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T #NR_TMP
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CALL SFC 4 (
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NR := #NR_TMP,
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RET_VAL := #RET_TMP,
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CQ := #CQ_TMP,
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CV := #CV_TMP,
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)
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__ASSERT== __STW BIE, 1
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L #RET_TMP
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__ASSERT== __ACCU 1, W#16#0000
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L #CV_TMP
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__ASSERT== __ACCU 1, W#16#0000
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U #CQ_TMP
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__ASSERT== __STW VKE, 0
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// Valid meter number (7, the maximum) - same expected state.
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L B#16#07
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T #NR_TMP
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CALL SFC 4 (
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NR := #NR_TMP,
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RET_VAL := #RET_TMP,
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CQ := #CQ_TMP,
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CV := #CV_TMP,
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)
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__ASSERT== __STW BIE, 1
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L #RET_TMP
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__ASSERT== __ACCU 1, W#16#0000
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L #CV_TMP
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__ASSERT== __ACCU 1, W#16#0000
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U #CQ_TMP
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__ASSERT== __STW VKE, 0
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// Invalid meter number (8): E_RPARM on parameter 1, BIE cleared.
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L B#16#08
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T #NR_TMP
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CALL SFC 4 (
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NR := #NR_TMP,
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RET_VAL := #RET_TMP,
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CQ := #CQ_TMP,
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CV := #CV_TMP,
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)
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__ASSERT== __STW BIE, 0
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L #RET_TMP
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__ASSERT== __ACCU 1, W#16#8080
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L #CV_TMP
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__ASSERT== __ACCU 1, W#16#0000
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U #CQ_TMP
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__ASSERT== __STW VKE, 0
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// Invalid meter number (255, max BYTE): same error path.
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L B#16#FF
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T #NR_TMP
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CALL SFC 4 (
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NR := #NR_TMP,
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RET_VAL := #RET_TMP,
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CQ := #CQ_TMP,
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CV := #CV_TMP,
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)
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__ASSERT== __STW BIE, 0
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L #RET_TMP
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__ASSERT== __ACCU 1, W#16#8080
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L #CV_TMP
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__ASSERT== __ACCU 1, W#16#0000
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U #CQ_TMP
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__ASSERT== __STW VKE, 0
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CALL SFC 46 // STOP CPU
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END_ORGANIZATION_BLOCK

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