Rockwell Automation 1557 MEDIUM VOLTAGE AC DRIVE - Manual (Page 130)

7-6 OPERATOR INTERFACE TERMINAL PV-550 REV E
1557-UM050F-EN-P – June 2013
The remainder of the screen shows the data from the drive. The presentation of the data is
dependent on the screen. Screens which allow an item to be selected show the current selection
in reverse video. An example of this is shown in Figure 2 in which the P_Nameplate group is
selected.
Information Windows
Numerous screens require communications with the drive in order to function. At times, the
duration of this activity will be noticeable to you. During this activity, a special 'window' is used
within the current screen to inform you of this activity. The time required for the activity will vary.
Accessing/Writing to Drive
The terminal when first powered up, knows very little about the information in the drive. As each
screen is activated, the terminal requests information from the drive which it will store within the
terminal for future reference. When the terminal requests information from the drive, a window is
used to display a message "Accessing Drive ...". During this time, the terminal will not respond to
any user input, until the task at hand is completed. You will notice that subsequent activation of
the same screen for the same data will be much quicker since the terminal already has most or all
of its required information.
You can selectively choose to download the complete database to the terminal on command, thus
eliminating the initial access delays. If uninterrupted, the terminal will automatically download the
database on powerup, or during periods of inactivity. Refer to the section on "Advanced Screen
Operations - Database Download".
Some screens require that information be written to the drive. During this task, a window is used
to display the message "Writing to Drive ...". During this time, the terminal will not respond to any
user input, until the task at hand is completed.
Communication Error
While the terminal is reading or writing to the drive, it is possible for communications to be
disrupted for a number of reasons. If this were to occur, a special window is used to inform you of
this. During this time, the terminal will not respond to any user input, until the task at hand is
completed.
The window for the "Communication Error" can take on two forms. If a window has already been
displayed showing "Accessing Drive" or Writing to Drive", then the communication error message
will be added to the window already in use. Some screens constantly read from the drive in order
to show real-time data. An example of this is the 'Top Level Menu' . When a communication
error occurs on a screen showing real-time data, a window is opened showing a box around the
"Communication Error". Two examples of this are shown in figures 4 and 5.
In both cases, once communications has been re-established, the information window will be
removed and the terminal will return to normal operation.