Troubleshooting The Arithmetic Block; Table 28: Arithmetic Block - Honeywell ST700 User Manual

Troubleshooting the Arithmetic block

Problem Cause
Arithmetic block mode is
in OOS and does not
change to AUTO mode.
Mode does not change
from OOS.
Value of output is
incorrect
Block alarms are not
reported.
Page 106 FOUNDATION Fieldbus ST 700 Pressure Transmitter User's Guide

Table 28: Arithmetic block

Things to check
Read
MODE_BLOCK.PERMITTED
Read MODE_BLOCK. ACTUAL
of Resource block.
Configuration error.
Error in configuration.
Read FEATURE_SEL.
Read LIM_NOTIFY.
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.
BLOCK_ERR shows the Block
Configuration Error condition, since
ARITH_TYPE is not set.
Ensure that engineering units are
correct for the computation. If that
fails, see section 3.
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.
Revision 2.0