Emerson Process Management MSL600 manual Security, On-line/Off-line

Installation, Operation & Maintenance Manual

IP262/Z0, Rev. AB

February 2012 MSL600

4.4 Security

The HMI includes a password system which may be used to protect parameters from unauthorised changes and also to prevent the system from being switched between On and Off-line mode.

The password is in the form of a 4-digit code (or PIN). When the user has entered the correct PIN then the password is said to be open (else closed). The PIN is a 4-digit code, value 0000 to 9999.

Once the password is open then all parameters may be edited.

A PIN of 0000 means that the password is disabled, i.e. no password is required to edit parameters.

Examining the PIN locally shows “- - - -” unless set to 0000.

When prompting for entering of PIN, the display shows “- - - -”.

A PIN is set or entered by scrolling each of the 4 digits using the ￿ and ￿ arrows to select the digit and ￿ and ￿ arrows to select the value for each digit.

No PIN is required to navigate the menus or to simply examine parameter values.

Attempting to change a parameter value prompts for the entering of the PIN (if it is not already open). If the parameter affects outputs, and if On-line, then after entering the PIN the user is offered go Off-line.

If the password is open then the main menu offers the option “Cancel Password” as the default (highest priority) option. Closing the password does not affect the On line/Off-line status.

The password is automatically closed after 5 minutes without any key press; this does not affect the On line/Off-line status.

4.5 On-line/Off-line

This feature allows the MSL600 outputs, i.e. its relays and current output to be frozen. Also, when On-line, the editing of all parameters which may affect these outputs is inhibited.

Off-line inhibits relays and current output.

On-line inhibits the editing of all parameters that may affect the outputs. These include relay, current output and alarm parameters.

The On line/Off-line state is shown by the padlock symbol at the top left-hand corner of the HMI display (padlock closed represents On-line).

Go On line/Off-line by selecting the appropriate item in the main menu. As the mode is toggled, a large image of the Padlock symbol opens and closes. Attempting to edit any parameter can only be performed with the unit Off-line.

If the system password is closed then the system will prompt for a password, once correctly entered then it changes as requested.

NOTE: There is no time-out on On-line or Off-line.

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