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COM/AZ40/MOD–EN Rev. A
| Endura AZ40 | Oxygen and carbon monoxide equivalent (COe) analyzer
Appendix A – MODBUS tables
A.1 Digital inputs
A.1.1 Sensor reading diagnostics
A.1.2 Transmitter function diagnostics
A.1.3 Transmitter and sensor diagnostic failure alarms
A.1.4 Transmitter and sensor diagnostic function alarms
A.1.5 Transmitter and sensor diagnostic
out of specification alarms
A.1.6 Transmitter and sensor diagnostic maintenance alarms
MODBUS coil
Description
0
Oxygen concentration value status
1
COe concentration value status
2
Inlet temperature value status
3
Outlet temperature value status
4
Outlet / Inlet temperature value status
5
Efficiency value status
MODBUS coil
Description
6
Transmitter failure diagnostic
7
Transmitter out of specification diagnostic
8
Transmitter maintenance diagnostic
9
Transmitter function check diagnostic
10
Sensor failure diagnostic
11
Sensor out of specification diagnostic
12
Sensor maintenance diagnostic
13
Sensor function check diagnostic
14
Active failure alarm
15
Calibration in progress
16
Blowback in progress
17
Zero gas valve check
18
Span gas valve check
19
Test gas valve check mode
20
Sample flow rate test mode
MODBUS
coil
Description
Diagnostic
alarm no.
21
ADC Failed
0
22
Sensor electronics cold junction failed
1
23
Oxygen heater failed
2
24
Flange block thermocouple failed
3
25
COe block thermocouple failed
4
26
Inlet thermocouple failed
5
27
Outlet thermocouple failed
6
28
Sensor non-volatile memory failed
7
29
Processor board non-volatile memory failed
8
30
Main board non-volatile memory failed
9
31
Reserved
10
32
Reserved
11
33
Comms board non-volatile memory failed
12
34
S/W key 1 non-volatile memory failed
13
35
Reserved
14
36
Reserved
15
37
Internal communication failure between
transmitter and sensor
16
38
Over temperature trip
17
MODBUS
coil
Description
Diagnostic
alarm no.
39
Flange, COe and oxygen heaters warming up
18
40
Flange, COe and oxygen heaters stabilizing
19
41
Calibrating
20
42
Blowback in progress
21
43
Sample flow rate test in progress
22
44
Manual valve test in progress
23
45
Remote zero gas test in progress
24
46
Remote span gas test in progress
25
47
Recovery stage after calibration / blowback /
manual valve test / flow rate test
26
48
In hold mode
27
49
In simulation mode
28
MODBUS
coil
Description
Diagnostic
alarm no.
50
Last sensor calibration failed
29
51
Process value out of range
30
52
Temperature value out of range
31
53
Flange block temperature is high
32
54
Flange block temperature is low
33
55
COe block temperature is high
34
56
COe block temperature is low
35
57
Oxygen heater current is high
36
58
Oxygen heater current is low
37
MODBUS
coil
Description
Diagnostic
alarm no.
59
Transmitter internal ambient temperature is high
38
60
Transmitter internal ambient temperature is low
39
61
Sensor CJC temperature is high
40
62
Sensor CJC temperature is low
41
63
Sensor ECJC temperature is high
42
64
Sensor ECJC temperature is low
43
65
Sensor power is turned off via SW1
44
66
Sensor mains selection is in the wrong position
45