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Honeywell 301C User Manual
420MDBS_IR-F9 continued
420MDBS_IR-F9 continued
94
Property Data Type
Required
1
Storage
Type
2
BACnet
Writeable?
Value
object_identifier R N N
Modbus address * 256 + 2. For example an
420MDBS at Modbus address 002 will
appear as 514 or 0x0202.
object_type enumerated R C N analog_value (2)
event_state enumerated R C N normal (0)
object_name character string R N N
"420MDBS GGGG AdXXX.Amin" where
GGGG is the gas name and XXX is the
Modbus address. Values for gas name
include "NH3".
out_of_service boolean R C N FALSE
present_value real R N Y
Gas threshold from 301C. Synchronization
is maintained with the 301C and the
420MDBS. Whichever value is written last
is distributed to the other two locations.
reliability enumerated O C N no_fault_detected (0)
status_flags
in_alarm boolean R C N always false (0)
fault boolean R C N always false (0)
overridden boolean R C N always false (0)
out_of_service boolean R C N always false (0)
units enumerated R C N
Depends on configuration of 420MDBS
factory configuration or 301C configuration,
usually ppm (96)
object_identifier R N N
Modbus address * 256 + 3. For example an
420MDBS at Modbus address 002 will
appear as 515 or 0x0203.
object_type enumerated R C N analog_value (2)
event_state enumerated R C N normal (0)
object_name character string R N N
"420MDBS GGGG AdXXX.Amin" where
GGGG is the gas name and XXX is the
Modbus address. Values for gas name
include "NH3".
out_of_service boolean R C N FALSE
present_value real R N Y
Gas threshold from 301C. Synchronization
is maintained with the 301C and the
420MDBS. Whichever value is written last
is distributed to the other two locations.
reliability enumerated O C N no_fault_detected (0)
status_flags
in_alarm boolean R C N always false (0)
fault boolean R C N always false (0)
overridden boolean R C N always false (0)
out_of_service boolean R C N always false (0)
units enumerated R C N
Depends on configuration of 420MDBS
factory configuration or 301C configuration,
usually ppm (96)
Notes
1 -- 'R' indicates that this property is required by ASHRAE Standard 135
'O' indicates that the property is optional in ASHRAE Standard 135
2 -- 'C' indicates the property is hard-coded as a constant
'N' indicates the property is stored in non-volatile memory
'R' indicate the property is computed constantly and stored in RAM.
continued…
Group
Analog Values
Amin
Amax