Diagnostic Attributes (P.-18) - Emerson MRLDS-250 Installation And Operation Manual

Fault
Description
Code
MODBUS
Fault
PPM
Overrange
Fault
Input
Voltage
Fault
Critical
:
Faults
Table 8-1 - Fault Codes
28 • MRLDS-250 Infrared Gas Detector I&O Manual
Possible 
Hex
Code Causes
0x00 MODBUS
20 message was
truncated or
timed out
early.
PPM exceeds
9999. This
may indicate
a gross (very
0x00 large) leak. If
40 no leak is
present, it
indicates a
gas detector
error.
Input supply
power to the
MRLDS-250
is out of
range (i.e.,
24V ±20%).
IMPORTA
NT: If this
fault is
0x00 active, the
80 gas detector
is offline and
not
monitoring.
Correct the
input supply
voltage to
restore
normal
operation.
Critical fault.
Cycle power
to the sensor
and see of the
fault clears.
If not,
:
contact
Emerson
technical
support for
additional
guidance.
IMPORTANT: Fault F.-15 may be caused by rapid
changes in temperature and other environmental
effects. If the F.-15 fault remains after the ambient
temperature has stabilized, perform a manual re-zero
to clear the fault. See Section 4.3., Perform a Manual
Zero.
8.2. Diagnostic Attributes
(P.-18)
Use this option to review the built-in diagnostic
attributes. Access the parameter list (see Section 5,
Configure the Gas Detector) and select P.-18. Press
the Enter button to access the diagnostics, and then
use the UP or DOWN button to select each attribute.
The following information is available.
Attribute
Displays the current fault
condition code in hex format:
0000 = no faults are active
XXXX = HEX number
See Table 8-1 for the HEX
format cross reference.
Displays a hex format code
that corresponds to any faults
that occurred since the
internal fault record was last
erased. See Table 8-1 for the
HEX format cross reference.
The records may be erased
by pressing the ENTER
button.
Displays the number of days
that the MRLDS-250 has
been in service. The value of
this attribute rolls over after
9999.
Table 8-2 - Diagnostics Attributes
Description
026-1315 Rev 4