LED operation mode LatchedReset-S
IEC08000400.vsd
= Steady = FlashIllumination =>
Man-
Reset
S1
S2
S3
S4
tMax
tRestart
S1LED
S2LED
S3LED
S4LED
Auto-
Reset
IEC08000400 V1 EN-US
Figure 57: LHMI: LED operation mode LatchedReset-S
The LatchedReset-S mode is designed for multi-signal disturbance monitoring. For
this reason, the General LED indication function block (LEDGEN) has two
parameters: tRestart and tMax. Both are timers used to determine the end of a
disturbance window.
A disturbance window starts when a LED receives a binary On signal. The LED
then enters a steady lit state. At the point where all signals, related to the LEDs in
this particular mode, are Off, the timer tRestart is triggered. This timer is common
for all LEDs and when it elapses, the disturbance window ends.
The second timer, tMax, starts whenever a LED is lit. If there are no activities until
tMax elapses, tRestart is triggered. This means that the disturbance window
eventually ends even if a signal remains On for a long time. See
Figure 57.
Section 7 1MRK 511 398-UEN C
Local HMI engineering
92 670 series 2.2 IEC
Engineering manual
To Next Page
Loading...
