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MLP-A/AR/AD-ST1400-25 11
RTU Registers
Register 40001 = % output (read only)
Register 40002 = RTU Status (read only)
Register 40101 = Reset latched relays (write)
Calibration Button
The Calibration Button provides access to the Millennium’s Main Menu, which
in turn allows calibration and options to be reviewed and set. Refer to Figure 12,
"Controller Functionality", on page 10 for more information.
• Press and hold the Calibration Button to Calibrate and access Main Menu.
• Briefly press to make a selection (select
YES? ).
WAR NI NG :
Opening the Controller’s Housing should be avoided when the
presence of gas is possible (when in a hazardous environment). Do
not power up the system, with the Housing removed, unless the area
has been de-classified.
Table 2: Status LEDs, Display Messages and Current Loop
Status LED
State Current O/P RED or GREEN Display
Options
Review/Settings
3.0 mA n/a n/a
Standard level of
Oxygen present
17.4 mA
Blip/
blink
20.9 %O2
Start-up delay (90 sec) 3.0 mA
Slow
flash
Start Delay
Access Main Menu 3.0 mA n/a
Switch On
10-0
Memory Error (contact
factory)
2.5 mA
Slow
flash
Memory Error
Black or Red Sensor
lead open
2.5 mA
Slow
flash
Sensor Fault
Auto zero set 3.0 mA Solid
Apply Clean
Air
Apply calibration gas 3.3 mA
Fast
flash
Apply 20.9%
O2
Span is set, remove
gas
3.6 mA Solid
Remove gas
Low alarm set point - Flash
XX Low Alarm
High alarm set point - Flash XX High Alarm
Non-standard levels of
Oxygen present
>17.4 mA or
<17.4 mA
Blip/
blink
% O2 shown left
side display
Calibration procedure
failed/Sensor failed
3.0 / 3.3 mA Flash Flash
Fail Cal
Over 25% Range 20 mA Solid
<25%O2
Table 3: RTU Status Register (40002) Read Only (Binary)
RTUstat_fault 0x0001 (fault sensor...)
RTUstat_low_alarm 0x0002 low alarm tripped
RTUstat_high_alarm 0x0004 high alarm tripped
RTUstat_low_alarm_latched 0x0008 low alarm latched
RTUstat_high_alarm_latched 0x0010 high alarm latched
RTUstat_powerUp 0x0080 power up delay
RTUstat_cal_cycle 0x0100 calibration cycle in progress
RTUstat_zeroing 0x0200
RTUstat_apply_span_gas 0x0400
RTUstat_calibrating 0x0800
RTUstat_remove_gas 0x1000
RTUstat_cal_complete 0x2000
RTUstat_mem_error 0x4000 memory error