Siemens Industry, Inc.
Building Technologies Division
A6V10328217_en--_f
2
The on-board microprocessor provides the MLC with the ability to function and
initiate alarm conditions even if the PMI/PMI-2/PMI-3 (XLS), FCM2041-U2 (Desigo
Fire Safety Modular), FCM2041-U3 (Cerberus PRO Modular) fails.
Controls and Indicators
The front panel of the MLC contains one reset switch, 9 LEDs, and three HNET
address switches, as shown in Figure 1. Pushing the reset switch re-initializes the
MLC operation.
The MLC must be re-initialized by pushing the module Reset switch any time the
24VDC supply is interrupted.
The LED functions are defined as follows:
POWER
(Green)
Normally ON. When illuminated,
indicates the power for the MLC is
applied to the card.
CARD FAIL
(Yellow)
Normally OFF. When illuminated,
indicates hardware failure on the
card or unsuccessful firmware
upload. During firmware upload, this
LED should blink.
HNET FAIL
(Yellow)
Normally OFF. When illuminated,
indicates that the HNET communica-
tion with the MLC has terminated.
ALARM
(Red)
Normally OFF. When illuminated,
indicates that the MLC has detected
an alarm.
TROUBLE
(Yellow)
Normally OFF. When illuminated,
indicates that a trouble is present on
the MLC that is not related to its
field wiring or slave ALD driver.
MAIN CIRCUITS TROUBLE
(Yellow)
Normally OFF. When illuminated,
indicates that the MLC has detected
a wiring trouble (fault) on device loop
1 or 2.
MAIN CIRCUITS GND FAULT
(Yellow)
Normally OFF. When illuminated,
indicates that the MLC has detected
a ground fault on device loop 1 or 2
field wiring.
EXPANSION CIRCUITS TROUBLE
(Yellow)
Normally OFF. Not used at this time.
EXPANSION CIRCUITS GND FAULT (Yellow)
Normally OFF. Not used at this time.