ABB 650 series Engineering Manual page 78

Section 6
Local HMI engineering
72
LED operation mode LatchedReset-S
S1
S2
S3
S4
tMax
tRestart
Auto-
Reset
Man-
Reset
S1LED
S2LED
S3LED
S4LED
Illumination => = Steady
IEC08000400 V1 EN
Figure 52: LHMI: LED operation mode LatchedReset-S
This mode is useful to monitor signals that are involved in case of a disturbance,
see Figure 52. 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
53, 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
= Flash
IEC08000400.vsd
1MRK 511 261-UEN -
Figure
650 series
Engineering Manual