Troubleshooting Blocks; Non-Functioning Blocks; Troubleshooting Block Configuration Errors; Troubleshooting The Resource Block - Honeywell ST700 User Manual

6.3

Troubleshooting blocks

Non-functioning blocks

Device block objects may not be running (executing their function block schedules) or the
blocks may be in Out of Service (OOS) mode due to block configuration error. For
example, if the AI function block is in OOS mode, the block does not provide updated
output values, although the AI block may be running. While troubleshooting a non-
functioning block objects, it is recommended to start with the resource block. For example,
if the resource block is in OOS mode, all other blocks in the device are also in the OOS
mode.

Troubleshooting block configuration errors

The block configuration errors prevent a device block from leaving the OOS mode. The
BLOCK_ERR parameter (bit 1) shows whether a block configuration error is present. The
following section explains the troubleshooting for all the function blocks:

Troubleshooting the Resource block

Problem cause
Resource block mode is OOS
mode and is not going to
AUTO mode.
Resource block is not running.
Incorrect revision level of the
device firmware.
Block alarms are not reported.
Field diagnostics alarms are
not reporting.
Revision 2.0 FOUNDATION Fieldbus ST 700 Pressure Transmitter User's Guide

Table 19: Resource block

Things to check
Read
MODE_BLOCK.PERMITTED
Read MODE_BLOCK. ACTUAL
of Resource block.
Check BLOCK_ERR for errors.
Read REVISION_ARRAY
Read FEATURE_SEL
Read LIM_NOTIFY
Check Field Diagnostics MASK.
Check Field Diagnostics Priority.
Check Field Diagnostics MAP.
Recommended action
Add AUTO mode to
MODE_BLOCK.PERMITTED.
If necessary, Set
MODE_BLOCK.TARGET to AUTO.
NOTE: If the mode is set to OOS for
maintenance, then do not change the
mode to AUTO.
See Table 3 for details on
BLOCK_ERR.
See section 6.2.
Reports are not selected in
FEATURE_SEL. If features do not
include Reports then the host must
poll for alarms.
Set LIM_NOTIFY to a value higher
than zero, but not higher than
MAX_NOTIFY.
If the alarms are MASKED, then the
alarms do not report. Unmask the
alarms.
If the priority is zero alarms do not
report. For information on how set the
priority, see Table 4.
If alarms are not mapped, then Map
alarms to any of the Field Diagnostics
alarm parameters.
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