Programming manual M238 | 3 MB - BERGER - POSITEC

7.2 Controller States Description
Controller States Description
Introduction
This section provides a detailed description of the controller states.
UNINTENDED EQUIPMENT OPERATION
WARNING
Controller States and Behaviors
Never assume that your controller is in a certain controller state before
commanding a change of state, configuring your controller options, uploading a
program, or modifying the physical configuration of the controller and its
connected equipment.
Before performing any of these operations, consider the effect on all connected
equipment.
Before acting on a controller, always positively confirm the controller state by
viewing its LEDs, confirming the condition of the Run/Stop input, checking for
the presence of output forcing, and reviewing the controller status information
via SoMachine (1) .
Failure to follow these instructions can result in death, serious injury, or
equipment damage.
(1) Note: The controller states can be read in the PLC_R.i_wStatus system variable
of the M238 PLCSystem Library (see Modicon M238 Logic Controller, System
Functions and Variables, M238 PLCSystem Library Guide)
Controller States Table
The following table describes the controller states:
Controller State Description RUN LED Err LED
BOOTING The controller executes the boot firmware and its own internal
self-tests. It then checks the checksum of the firmware and user
applications. It does not execute the application nor does it
communicate.
Off Flashing red
INVALID_OS There is not a valid firmware file present In the Flash memory.
The controller does not execute the application. Communication
is only possible through the USB host port, and then only for
uploading a valid OS.
Refer to Upgrading an M238 Firmware (see page 181).
Off Flashing red
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