Table 5-1 Status Leds, Display Messages, And Current Loop; Table 5-2 Rtu Status Register (40002) Read Only (Binary) - Emerson Net Safety MLP-A-SC1100 User Manual

January 2017

Table 5-1 Status LEDs, Display messages, and current loop

Current
State
output
Calibrate sensor 3.0 mA
Normal operation 4.0 mA
Start-up delay
3.0 mA
(90 seconds)
Access main
3.0 mA
menu & options
Memory error 2.5 mA
Sensor lead open 2.5 mA
Excess drift
2.5 mA
(>10%)
Auto Zero set 3.0 mA
Apply cal. gas 3.3 mA
Span is set,
3.6 mA
remove gas
Calibration
3.6 mA
successful
Sensor guard 20.0 mA
Gas present > 4–20 mA
Failed calibration 3.0/3.3 mA
14
Status LED
Display
red or green
N/A N/A
Green
N/A 00 %LEL
blip/blink
Red slow
N/A Start delay
flash
Switch on
N/A
(10→0)
Red slow Memory
N/A
flash error
Red slow
N/A Sensor Fault
flash
Red
N/A Neg. drift
blip/blink
Green Apply clean
N/A
Solid air
Red fast Apply 50%
N/A
flash span gas
Green
N/A Remove gas
solid
Green Cal.
N/A
solid complete
Red Solid N/A 100% LEL
Red 1–100% full
N/A
blip/blink scale
Red Green
Fail cal.
flash flash

Table 5-2 RTU Status register (40002) Read only (binary)

RTU Status registers and meaning
RTUstat_fault
RTUstat_low_alarm
RTUstat_high_alarm
RTUstat_low_alarm_latched
RTUstat_high_alarm_latched
RTUstat_lel_60_latched
RTUstat_lel_100_latched
RTUstat_powerUp
RTUstat_cal_cycle
RTUstat_zeroing
RTUstat_apply_span_gas
RTUstat_calibrating
RTUstat_remove_gas
RTUstat_cal_complete
RTUstat_mem_error
1. Register 40001 = LEL output (read only)
2. Register 40002 = RTU status (read only)
3. Register 40101 = Reset latched relays (write)
Operations Manual
FGD-MAN-0047
0x0001 Fault(sensor)
0X0002 Low alarm tripped
0X0004 High alarm tripped
0X0008 Low alarm latched
0X0010 High alarm latched
0X0020 60% LEL latched
0x0040 100% LEL latched
0x0080 Power up delay
Calibration cycle in
0X0100
progress
0x0200 zeroing
0x0400 Apply span gas
0x0800 Calibrating
0x1000 Remove gas
0x2000 Calibration complete
0X4000 Memory error