Ma1 Output Analyzer Fault Alarm - Michell Instruments Condumax II User Manual

MAINTENANCE
If more than one error has occurred, then the Error Codes will be added together.
Examples:
1 Error Code
Error Code
plus
Error Code
(0100 + 0004 = 0104)
2 Error Code
Error Code
plus
Error Code
(0080 + 0040 = 00C0)
3 Error Code
Error Code
plus
Error Code
plus
Error Code
(0100 + 0080 + 0002 = 0182)
NOTE: In hexadecimal
A = 10
B = 11
C = 12
D = 13
E = 14
F = 15
4.6.3

mA1 Output Analyzer Fault Alarm

The mA1 output has the facility to output an analyzer fault alarm condition of 23 mA
when one or more of the error conditions occur, as described in Section 4.6, in order to
facilitate a hardware indication of a fault condition.
To activate this alarm when a specifi c error condition occurs, the corresponding error
bit in the Modbus ERROR MASK register (40) has to be set to a '1'. For example, to
activate this alarm if the instrument is unable to reach the trip point, then the ERROR
MASK register has to be set to 0001. Likewise, if the alarm is to activate when there is a
'HCdp pressure transmitter failure' and/or 'Failed to reach recovery temperature' and/or
'Unable to adjust Optics' error condition as in Example 3 above, then the ERROR MASK
register has to be set to 0182.
Refer to Appendix B on Modbus RTU Communications and Appendix F on Number
Formats for additional information.
44
=
0104
(HCdp pressure transmitter failure)
0100
( No fl ow during the recovery phase)
0004
=
00C0
(Failed to reach recovery temperature)
0080
(Heat-pump failure)
0040
=
0182
(HCdp pressure transmitter failure)
0100
(Failed to reach recovery temperature)
0080
(Unable to adjust Optics)
0002
Condumax II User's Manual
97081 Issue 28.1, July 2018