Run/Stop

Overview

The M241 Logic Controller can be operated externally by the following:

  • A hardware Run/Stop switch.

  • An EcoStruxure Machine Expert software command.

  • A Run/Stop operation by a dedicated digital input, defined in the software configuration. For more information, refer to Embedded I/Os Configuration.

  • The system variable PLC_W in a Relocation Table.

  • The Web server.

The M241 Logic Controller has a Run/Stop hardware switch, which puts the controller in a RUNNING or STOPPED state.

The interaction of the 2 external operators on the controller state behavior is summarized in the table below:

 

Embedded hardware Run/Stop switch

Switch on Stop

Stop to Run transition

Switch on Run

Software configurable Run/Stop digital input

None

STOPPED

Ignores external Run/Stop commands.

Commands a transition to RUNNING state(1).

Allows external Run/Stop commands.

State 0

STOPPED

Ignores external Run/Stop commands.

STOPPED

Ignores external Run/Stop commands.

Rising edge

Commands a transition to RUNNING state (1).

Commands a transition to RUNNING state.

State 1

Commands a transition to RUNNING state (1).

Allows external Run/Stop commands.

(1) For more information, refer to the Controller States and Behaviors.

 WARNING
UNINTENDED MACHINE OR PROCESS START-UP
  • Verify the state of security of your machine or process environment before applying power to the Run/Stop input or engaging the Run/Stop switch.
  • Use the Run/Stop input to help prevent the unintentional start-up from a remote location, or from accidentally engaging the Run/Stop switch.
Failure to follow these instructions can result in death, serious injury, or equipment damage.