Model MMU-1600G Series Op Man - Ver 1.07.23 - Rev 20151026DL
Page 50 of 58
4.7
FRONT PANEL LED INDICATORS
The monitor has 77 light emitting diodes (LEDs) that are used to convey information to
the user. These LEDs are color coded to increase viewability and enhance the
intuitiveness of the display. The LEDs are extremely bright to allow viewing of the
front panel indicators in direct sunlight. The front panel display is updated every 16
milliseconds.
The front panel display is broken up into four logical groups: Field Status, Power /
Type, Transmit / Receive, and Fault.
4.7.1 Field Status Indicators
There are 60 field status indicators, one for each field input defined by the TS 2
specification for Type 16 and Type 12. The display is logically organized into four
columns and sixteen rows. The columns are labeled
R
for Red,
Y
for Yellow,
G
for
Green, and
W
for Walk. The rows are numbered from
1
to
16
, corresponding to the
channel numbers for Type 16 and Type 12.
The indicator for a field input will be on if the RMS voltage over the last 33 milliseconds (two cycles of AC power) is above
the threshold for that type of input. (See Section
3.2
for the voltage levels for each type of input.)
When a fault is detected, the field status is latched and the field input involved in the detected fault will flash at a 5 Hz rate.
The following table lists the information displayed on the Field Status indicators during the various fault conditions.
FAULT CONDITION FIELD STATUS INDICATION
24V-1
24V-2
CVM / WD
PORT 1 FAIL
ON
- Field inputs that were ON for at least 33 milliseconds at the time of the fault.
CONFLICT
ON
- Field inputs that were ON for at least 33 milliseconds at the time of the fault.
FLASHING
- Field inputs that were ON and were the cause of the fault.
DIAG FAIL
ON
– The binary coded value of the diagnostic error code with channel 1 being the least significant bit and
channel 16 the most significant bit.
NOTE: This may be incorrectly displayed depending on the type of diagnostic failure being
experienced.
SHORT YEL
ON
- Field inputs that were ON for at least 100 milliseconds at the time of the fault.
FLASHING
- The Yellow field inputs on which a Short Yellow was detected.
SHORT CLR
ON
- Field inputs that were ON for at least 33 milliseconds at the time of the fault.
FLASHING
- The Green field inputs that were not OFF for at least 2.7 seconds before a conflicting channel
was detected as active.
FIELD CHK
ON
- Field inputs that were ON for at least 33 milliseconds at the time of the fault.
FLASHING
- The field inputs that did not agree with the load switch commands from the CU.
LOC FLASH
PRGM CARD
Current field status. (NOT LATCHED)
RED FAIL
ON
- Field inputs that were ON for at least 100 milliseconds at the time of the fault.
FLASHING
- All field inputs for the channel(s) that had no display.
DUAL IND
ON
- Field inputs that were ON for at least 100 milliseconds at the time of the fault.
FLASHING
- Field inputs that were ON and were the cause of the fault.
4.7.2 Power / Type Indicators
The
POWER
indicator is on continuously when the AC line voltage is above 98V
RMS
. When the AC line voltage is below
89V
RMS
, the indicator will flash at a 1 Hz rate to indicate low line voltage. While the AC line voltage is low, all field status
indicators will be off. Any active fault indicators will stay on.
The
TYPE 12
indicator is on continuously when the monitor is operating in the Type 12 mode. This occurs when the Type
Select input (Connector A - Pin HH) is not at a True (Low) logic level. This indicator will have a disabled indication if the
monitor is configured to operate in Type 16 only mode.
4.7.3 Transmit / Receive Indicators
The
RECEIVE
indicator turns on for 50 milliseconds every time a valid SDLC frame addressed to the monitor is received.
The
TRANSMIT
indicator turns on for 50 milliseconds every time a SDLC frame is transmitted.
4.7.4 Fault Indicators
When the monitor Output relay contacts are transferred to the fault condition and the monitor is not timing Minimum Flash, a
fault indicator will be illuminated to identify the source of the fault.
