Rockwell Automation 1764-xxxx MICROLOGIX 1500 PROGRAMMABLE CONTROLLERS - Manual (Page 100)

Publication 1764-UM001B-EN-P - April 2002
5-8 Using Trim Pots and the Data Access Tool (DAT)
working screen consists of three dashes that move across the display
from left to right. While the working screen is displayed, key presses
are not recognized. Once the DAT receives data from the controller, it
returns to its normal mode of operation.
If you encounter excessive working screen conditions, you can
minimize the effect by adding an SVC instruction to the control
program. Refer to the MicroLogix 1200 and MicroLogix 1500
Programmable Controllers Instruction Set Reference Manual,
publication 1762-RM001, for information on the SVC instruction.
Non-Existent Elements
When the DAT determines that an element number does not exist in
the controller, the element value displays as three dashes.
If the protection bit for an element is undefined, the DAT will assume
that the element is unprotected.
Controller Faults
The DAT checks for controller faults every 10 seconds. When the DAT
detects a controller fault, the display shows “FL” in the element
number field and the value of the controller’s major fault word (S2:6)
is displayed in the value field, as shown below.
TIP
If an element value is being modified when the
fault is detected, the fault is stored until the
modification is accepted or discarded. Then, the
fault will be displayed.
F1
BIT
F2
INT
ESC
ENTER
PROTECTED
l f
0 0 0 2 H