13. Series 8 I/O Alarms And Failures; 13.1 Reviewing Iom Alarms Generated By The C300; Iom Alarms; Hart Alarms/Events - Honeywell Series 8 I/O User Manual

13. Series 8 I/O Alarms and Failures

13.1 Reviewing IOM alarms generated by the C300

IOM alarms

The IOM block reports diagnostic alarms in the event of an IOM hardware failure or a
change in the IOM redundancy state. The IOM alarms that the C300 presents are listed in
the notification table below.

Table 66 IOM alarms displayed by the C300 controller

Notification type
Diagnostic alarm
System info event

HART alarms/events

The following are added to Series 8 HART IOMs.
Field device status notifications
Field device status notifications has one more extra byte called "extended device status
notifications". This byte is supported only by HART 6.0 devices.
Currently, only the following two bits of this byte are defined.
Extended device condition/bit
Maintenance required / Bit 0
Device variable alert / Bit 1
HALARMENABLE
A new parameter HALARMENABLE is added to HART configuration tab in the
channel block. This parameter is by default enabled and can be changed from Monitoring
side, irrespective of the channel point execution state of the IOM module state.
R500
April 2017
Auxiliary descriptor text

Communication error

Configuration mismatch

No response

IOM power on

IOM switchover
Type
Alarm
Alarm
Series 8 I/O User's Guide
Honeywell
Definition
Device requires maintenance.
Any device variable is in alarm or
warning state.
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