1761 MICROLOGIX PDFJune 20, 2020
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Before power is applied and communication between a connected programming device is established, the only form of communication between yourself and your MicroLogix controller is through LEDs. See the tables below to interpret your LED Status. When power is connected, only microloix power LED turns on and remains on. This is part of the normal powerup series.
If a microolgix is present, the force LED is on as well. Consult the following text references to understand the status of your MicroLogix ‘s LED indicators: F means the LED is Flashing. If an error exists microkogix the MicroLogix controller, the controller LEDs illuminate as described in the following tables.
Contact your local Allen-Bradley representative if the error persists. If unsuccessful, repeat recommended action steps above.
The schematic provides common questions you might ask to help troubleshoot the system. While a program is executing, a fault may occur within the operating system or your program.
When a fault occurs, you have several ways to determine what the fault is and how to correct it. This section 1716 how to clear faults and gives a list of possible advisory messages with recommended corrective actions.
You can automatically clear a fault when cycling power to the MicroLogix controller by setting either one or both of the following status bits in the status file: You can declare your own application-specific major fault by designating your own unique value to S: The occurrence of recoverable or non-recoverable user faults causes file 3 to be mucrologix.
If the fault is recoverable, the sub-routine can be used to correct the problem and clear the fault bit S: The subroutine does not execute for non-user faults. This sections describes fault messages that can occur during mivrologix of the MicroLogix programmable controllers. Each table lists the error code description, the probable cause, and the recommended action to solve the error.
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Processor Memory Error 2. Monitor Status File Word S: Remove the hardware or software condition causing the fault. Press F10 to clear the fault.
MicroLogix 1000 Programmable Logic Controller Systems
Is the error hardware related? If YES, check the wire connections. If NO, 1 Tighten wire connections, and F.
P does the controller have power supplied? Identifying MicroLogix Faults While a program is executing, a fault may occur within the operating system or your program. Automatically Clearing Faults You can automatically clear a fault when cycling power to the MicroLogix controller by setting either one or both of the following status bits in the status file: Fault Override at Powerup bit S: Clearing a fault using the Run Always bit S: Ensure you fully understand the use of this bit before incorporating it into your program.
Fault Messages This sections describes fault messages that can occur during operation of the MicroLogix programmable controllers. This occurs on power-up if the power down occurred during a download, or if the user program is corrupt at power up, the default program is loaded. Re-download the program and enter the REM Run mode. If the user program downloaded to the controller is valid, the initial data downloaded with the program is used.
If the user program is invalid, the default program is loaded. Refer to proper grounding guidelines. Your program may be valid, but retentive data will be lost. Try cycling power again. If the user program is valid, the program and initial data downloaded to the controller is used and the Retentive Data Lost Bit S: If the user program is invalid, error takes place.
Cycle power on your MicroLogix unit. Download your program and reinitialize any necessary data. Start up your system. Cycle the power on your MicroLogix unit. Download your program, and reinitialize any necessary data.
Allen Bradley MicroLogix AB
Cycle the power on your unit. If you want to use a micro controller with the program, configure your controller 17611 your programming software.
Either reset bit S: Either the program does not have the correct number of files, or it does not have the correct size data files. The default program is downloaded. Check the configuration and make sure the correct processor is selected. If you want to use a MicroLogix with the program, reconfigure your controller with your programming software.
Enter the status file display and clear the fault, then return to the REM Run mode.
Set the STI interval between the values of 0 and Reload the program and enter the REM Run mode. Correct the user program to meet microloogix requirements and restrictions for the JSR instruction. Correct the user program so that it does not go beyond file boundaries.
Correct the user program to meet the requirements and restrictions for the main program file. Modify the program so that all instructions are supported by the MicroLogix controller. Correct the program to make sure that the length and position parameters microloix not point past the data file.
Reload the program and begin REM Run mode. Correct the micrologis to ensure that the length parameter does not point past the data file.
Check to make sure the presets are valid.
Correct the program, reload, and enter the REM Run mode. Remove the RET instruction. This may microlpgix been caused by noise. For point controllers this includes bits For point controllers this includes bits Set S: Power Run Fault Force.
This problem can occur occasionally if power supply is overloaded when output loading and temperature varies. Check connections to the MicroLogix controller. The default program is loaded mmicrologix the computer memory. The controller was unexpectedly reset due to a noisy evnironmentt or internal hardware failure. While power cycling to your MicroLogix controller, a noise problem may have occurred. Data files input, output, timer, counter, integer, binary, control, and status are corrupt.
The MicroLogix controller software has detected an invalid condition within the hardware or software after completing power-up processing once the first 2 seconds of operation have been completed. The MicroLogix controller software has detected an invalid condition within the hardware during start-up processing once the first 2 seconds of operation have been completed. The system powered up in the REM Run mode. An incompatible program was downloaded. Ensure the program is caught in a loop and correct the problem, and increase the watchdog timeout value in the status file.
The program contains an instruction micologix instructions that are not supported by the micro controller. If the program is moving values to the accumulated or preset word of a timer, ensure these values are positive. The program contains a Temporary End TND instruction in file 3, 4, or 5 when it is being used as an interrupt subroutine. Either a zero 0 or a negative high preset was entered to counter C5: When ourputs were written and read back by the MicroLogix controller, the read failed.
An extra output bit was set when the Extra Output Select S: