Siemens SIMATIC TIWAY 1 - Manual (Page 173)

ERROR CODES AND DIAGNOSTICS
UNILINK HOST ADAPTER 6–10
USER MANUAL
6.4.1 The LEDs
Only the Adapter Good LED is visible through the door during normal
operation. The Adapter Good LED will remain lit when the adapter is operating
properly. The remaining LEDs assume the meanings shown in Figure 6–2
during normal operation. At any given time, the Online, Receive, and Transmit
LEDs may be on, off, or flashing during normal operation.
Adapter
Good
Online Receive Transmit
Figure 6–2 LEDs During Normal Operation
6.4.2 Performing Diagnostic Tests
The diagnostic tests are initiated either by pressing the RESET switch located
to the left of the LEDs or by issuing one of the software reset commands.
WARNING
Pressing the RESET switch or sending the
RESET ADAPTER command (code FF) causes a
hardware reset and stops all system operation.
All buffers and macros will be cleared and the
adapter will enter the diagnostic test mode
regardless of the system activity in progress at
the time.
There are two diagnostic test modes available for checking the adapter’s
operational integrity. These modes are selected by the setting of Position 10 on
Dipswitch 2 shown in Figure 6–3. When the switch is down, the adapter is in the
run mode or normal operation mode. Any reset by a command or the RESET
switch will cause the adapter to perform its diagnostics and then return to run
mode with the Adapter Good LED lit if the tests are successful. If an error
occurs, the LEDs will be lit in a pattern that defines the particular test that
failed. These patterns are described in Paragraph 6.4.3. The diagnostic tests in
this mode do not perform any of the external loopback tests.