Switches And Indicator Lights; Online/Offline Switch; Self-Test Button; Reset Button - Siemens SIMATIC TI500 User Manual

3.3

Switches and Indicator Lights

Online/Offline
Switch

Self-Test Button

Reset Button

3-10 Gateway Installation and Configuration
Figure 3-5 Gateway Operation Switches
The Online/Offline switch, when placed in the Online position, allows the
Gateway to communicate with the network and the other systems connected
to the Gateway. In the Offline position, the Gateway is disconnected from
the network. This prevents access to the network while secondaries are
being changed or while maintenance is being performed. The position of this
switch is read before each communication cycle, so a reset of the Gateway is
not necessary each time the Online/Offline switch position is changed.
The Self-Test button initiates a set of Gateway diagnostic tests, including a
standalone Gateway communications loopback test. This test requires a
special hardware set-up, using the loopback connector supplied with the
Gateway. This procedure is described more fully in the section on Diagnostic
Tests. The Gateway must have the Online/Offline switch in the Offline
position to initiate the diagnostic tests.
Pressing the Reset button causes a hardware reset of the Gateway and
initiates the power-on diagnostic test. The power-on test is explained in
more detail in the section on Diagnostic Tests.
Reset
Self-Test
Online
Online/Offline
Offline
TIWAY I Gateway User Manual
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