Error When Setting Exception List. Received
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1. The request is successfully processed by the slave and a valid response is sent. 2. The request is not received by the slave therefore no response is sent. 3. The request is received by the slave with a parity, CRC or LRC error. The slave ignores the request and sends no response. 4. The request is received without an error, but cannot be processed by the slave for another reason. The slave replies with an exception response. In a normal response, the slave echoes the function code. The first sign of an exception response is that the function code is shown in the echo with its highest bit set. All function codes have 0 for https://sourceforge.net/p/pydev/mailman/message/27751997/ their most significant bit. Therefore, setting this bit to 1 is the signal that the slave cannot process the request. Function Code in Request Function Code in Exception Response 01 (01 hex) 0000 0001 129 (81 hex) 1000 0001 02 (02 hex) 0000 0010 130 (82 hex) 1000 0010 03 (03 hex) 0000 0011 131 (83 hex) 1000 0011 04 (04 hex) 0000 0100 132 (84 hex) 1000 0100 05 (05 hex) 0000 0101 133 (85 hex) 1000 0101 http://www.simplymodbus.ca/exceptions.htm 06 (06 hex) 0000 0110 134 (86 hex) 1000 0110 15 (0F hex) 0000 1111 143 (8F hex) 1000 1111 16 (10 hex) 0001 0000 144 (90 hex) 1001 0000 Here is an example of a request with an Exception Response: Request This command is requesting the ON/OFF status of discrete coil #1186from the slave device with address 10. 0A 01 04A1 0001 AC63
0A: The Slave Address (0A hex = address10 ) 01: The Function Code 1 (read Coil Status) 04A1: The Data Address of the first coil to read ( 04A1 hex = 1185 , + 1 offset = coil #1186 ) 0001: The total number of coils requested. AC63: The CRC (cyclic redundancy check) for error checking. Response 0A 81 02 B053 0A: The Slave Address (0A hex = address10 ) 81: The Function Code 1 (read Coil Status - with the highest bit set) 02: The Exception Code B053: The CRC (cyclic redundancy check). Following the Function Code is the Exception Code. The exception code gives an indication of the nature of the problem. The possible codes are shown in the table below. The exception code shown above 02 is an indication that coil #1186 is an illegal address in the slave. This coil has not been defined in the slave's modbus map. The exception codes as explained in the Modbus specification are: Exception Code Name Meaning 01(01 hex) Il& Guides Learn the Web Tutorials References Developer Guides Accessibility https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error Game development ...more docs Mozilla Docs Add-ons Firefox WebExtensions Developer ToolsFeedback Get Firefox help Get web development help Join the MDN community Report a https://docs.python.org/2/c-api/exceptions.html content problem Report a bug Search Search Languages Català (ca) Deutsch (de) Español (es) Français (fr) Bahasa Indonesia (id) 日本語 (ja) 한국어 (ko) error when Polski (pl) Português (do Brasil) (pt-BR) Русский (ru) 中文 (简体) (zh-CN) 正體中文 (繁體) (zh-TW) Add a translation Edit Advanced Advanced History Print this article MDN Web technology For developers JavaScript JavaScript reference Standard built-in objects Error Your Search Results ariyankhan josephmcasey AlexanderFradiani fscholz mondwan SphinxKnight janosch-x davidchase Mingun shawnacscott error when setting Sheppy ethertank Nickolay evilpie trevorh teoli davidbourguignon secoif DomenicDenicola dgchurchill timemachine3030 Sevenspade Potappo Sephr Brettz9 Mgjbot Allanbonadio Ptak82 JustinLudwig Error In This Article SyntaxParametersDescriptionError typesPropertiesMethodsError instancesPropertiesStandard propertiesVendor-specific extensionsMicrosoftMozillaMethodsExamplesThrowing a generic errorHandling a specific errorCustom Error TypesSpecificationsBrowser compatibilitySee also The Error constructor creates an error object. Instances of Error objects are thrown when runtime errors occur. The Error object can also be used as a base object for user-defined exceptions. See below for standard built-in error types. Syntax new Error([message[, fileName[, lineNumber]]]) Parameters message Optional. Human-readable description of the error. fileName Optional. The value for the fileName property on the created Error object. Defaults to the name of the file containing the code that called the Error() constructor. lineNumber Optional. The value for the lineNumber property on the created Error object. Defaults to the line number containing the Error() constructor invocation. Description Runtime errors resul
is important to understand some of the basics of Python exception handling. It works somewhat like the Unix errno variable: there is a global indicator (per thread) of the last error that occurred. Most functions don't clear this on success, but will set it to indicate the cause of the error on failure. Most functions also return an error indicator, usually NULL if they are supposed to return a pointer, or -1 if they return an integer (exception: the PyArg_*() functions return 1 for success and 0 for failure). When a function must fail because some function it called failed, it generally doesn't set the error indicator; the function it called already set it. It is responsible for either handling the error and clearing the exception or returning after cleaning up any resources it holds (such as object references or memory allocations); it should not continue normally if it is not prepared to handle the error. If returning due to an error, it is important to indicate to the caller that an error has been set. If the error is not handled or carefully propagated, additional calls into the Python/C API may not behave as intended and may fail in mysterious ways. The error indicator consists of three Python objects corresponding to the Python variables sys.exc_type, sys.exc_value and sys.exc_traceback. API functions exist to interact with the error indicator in various ways. There is a separate error indicator for each thread. void PyErr_PrintEx(intset_sys_last_vars)¶ Print a standard traceback to sys.stderr and clear the error indicator. Call this function only when the error indicator is set. (Otherwise it will cause a fatal error!) If set_sys_last_vars is nonzero, the variables sys.last_type, sys.last_value and sys.last_traceback will be set to the type, value and traceback of the printed exception, respectively. void PyErr_Print()¶ Alias for PyErr_PrintEx(1). PyObject* PyErr_Occurred()¶ Return value: B