Input Run/Stop

The %lr.m.c input can be parameterized to switch the PAC to Run/Stop mode as follows:

  • Set %lr.m.c to 1: The PAC switches to Run mode (executing the program).

  • Set %lr.m.c to 0: The PAC switches to Stop mode (stopping program execution).

NOTE: A Stop command takes priority over a Run command. A Stop command sent from a terminal or via the network has priority over the %lr.m.c input.

An error detected on the Run/Stop input causes the PAC to switch to Stop mode.

Do not enable this option if the associated discrete input is mapped in state RAM because this inhibits the start-up of the PAC.

Memory Protect

The input %lr.m.c can be parameterized to protect the internal application RAM and the memory card as follows:

  • %lr.m.c to 0: The internal application and the memory card are not protected.

  • %lr.m.c to 1: The internal application and the memory card are protected.

NOTE: If the input is in error, %lr.m.c is considered at 1 (memory is protected). To remove this protection in the configuration screen, the input should not be in error.

Managing Run/Stop Remote Access

When configuring the M580 CPU, you can help prevent remote commands/requests from accessing the CPU Run/Stop modes. Select the respective Run/Stop input and Run/Stop by input only check boxes according to the following table parameters to determine the type of remote access for your system.

Run/Stop Input

Run/Stop by Input Only

Description

–

–

Allows remote access to run/stop the CPU by request.

X

–

  • Allows remote access to stop the CPU by request

  • You can run the CPU by input only.

X

X

Denies remote access to run/stop the CPU by request.

X: check box selected

–: check box deselected