LED operation mode LatchedReset-S
IEC08000400.vsd
= Steady
= Flash
Illumination =>
Man-
Reset
S1
S2
S3
S4
tMax
tRestart
S1LED
S2LED
S3LED
S4LED
Auto-
Reset
IEC08000400 V1 EN
Figure 51:
LHMI: LED operation mode LatchedReset-S
This mode is useful to monitor signals that are involved in case of a disturbance, see
. The signal state after the disturbance allows a fast overview about the
disturbance. To get always the situation of the last occurred disturbance, the LEDs are
reset after a predefined time (tReset). So this is the longest time a disturbance can be
monitored by the LED situation.
In case a second disturbance occurs before the tReset time has elapsed, see
the signals that are still ON at the end of tReset will return to ON with the next
application configuration cycle after tReset. To clear these LEDs, a second timer tMax
is used. TMax is started when the first signal of the disturbance changes to ON. tMax
is stopped, when tReset could clear all LEDs.
A disturbance runs for a maximum of some seconds, while tReset can be in the range
of 60 to 90 seconds.
The timer tReset and tMax are configured in Parameter Setting tool as part of the
function block LEDGEN
1MRK 511 245-UUS -
Section 6
Local HMI engineering
650 series ANSI
77
Engineering Manual
