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Chapter 2
Introduction to the DL20
Self Testing and Diagnostics
2–4
Auxiliary Devices
Messages that display on the DL20 can be sent to a printer with the
time and date.
On large machines, or on production lines, you may want to use a remote
display. The DL20 can connect to 100 slave DL10 displays (up to 4000
feet away). Each DL10 can have a different address. You can define, on a
message-by-message basis, the slave display on which a triggered message
appears. Triggered messages can be sent to individual or all slaves.
Power On Testing
When power is first applied to the DL20, a series of test programs are run.
They check the circuitry in the display and the integrity of messages stored in
memory. You can run these test programs from the programming keyboard
or a controller program.
Autorun
The autorun feature allows the display to restart in run mode on powerup if
the display was turned off in run mode. A message displays for three
seconds indicating that the DL20 is entering the autorun mode. An autorun
message, if present, is the first message displayed.
Note: All diagnostics must pass before the DL20 restarts in run mode. In
addition, the user memory must not have been lost while the power was off.
CPU ACTIVE Light
The CPU ACTIVE light on the front panel must receive a periodic signal
from the CPU to illuminate. Its normal appearance ranges from periodic
flashing to steady illumination.
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