Nexto Xpress - Starting in STOP mode

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This tutorial describes guidelines and procedures for starting Nexto Xpress CPUs (XP3xx) so that the application is not loaded when an exception occurs.

Components

Software: MasterTool IEC XE v3.30

PLC: XP3xx

Tutorial Sections

1. ARCHITECTURE

2. DEVELOPMENT

   2.1. Inserting USB device

   2.2. Starting the CPU

1. ARCHITECTURE

In the architecture of this tutorial, a network cable will be used to connect the computer to the Nexto Xpress XP325 CPU. The CPU's Ethernet port connects to the computer's Ethernet port.

2. DEVELOPMENT

This tutorial will show how to start the Nexto Xpress CPU in Stop mode as a result of a software exception in the application.

When a CPU is in Exception, it indicates that some improper operation has occurred in one of the active application tasks. These tasks are suspended and the others go into Stop mode, and the only way to remove them from this state is to restart the CPU without the application.

It is important to have the Nexto Series Manual on hand to allow the user to consult it during the application steps. This document will guide you regarding technical characteristics, mechanical installation, initial programming, configurations, and future maintenance.

2.1. Inserting USB device

First, create an empty text file called dontbootapp and place it on a USB mass storage device (flash drive). With the CPU powered off, insert this device into the USB port.

Location of the USB port:

Note: The USB mass storage device must be formatted as a FAT32 volume. Other file system formats are not supported.

2.2. Starting the CPU

After completing the previous procedure, simply power on the CPU. With the dontbootapp.txt file on the USB device, the controller is prevented from automatically loading the application after power-up.

After initialization, the CPU will be without an application and in Stop mode.

To load the application again, the improper operation that caused the Exception must be corrected so that the problem does not occur again. The USB device should be removed and login can be performed.