Reference MVI56-DEM
♦
ControlLogix Platform
Honeywell DE Communication Module
ProSoft Technology, Inc.
Page 63 of 80
March 6, 2008
Bit Name
Description
4 SFC
Detected This flag indicates that the DE CPU has detected that the SFC has
changed transmitter parameters. This bit is for status indication only
in the PLC but is used by the DEM as part of the parameter
mismatch logic.
5
SV Updated Flag
(Toggles)
This flag indicates that the DEM has received a new SV value from
the instrument in this DE Channel. This flag will be toggled during
the next Block Transfer with the current BTR Block ID number,
unless a new SV value is received again.
6
Config Data Base
Update
(Toggles)
This flag indicates that the DEM has received a new Configuration
Data Base from the DE CPU. This flag will only be updated by the
DE CPU when the complete data base has been received from the
instrument. be toggled during the next Block Transfer with the
current BTR Block ID number.
7 Spare
8
Cold Junction Ref
A flag indicating if cold junction reference is being used by the
transmitter. This value may be changed in the instrument by the PLC
via the Download Function.
0
External reference used
1
Internal (to transmitter) reference is used
9
Open
Thermocouple
Detect
A flag indicating if Open Thermocouple Detection is enabled in the
transmitter. This value may be changed in the instrument by the PLC
via the Download Function.
0
Detection Not Enabled
1 Detection
Enabled
10 Freq
50
A flag indicating if 50 or 60 Hertz filtering is being used in the
transmitter. This value may be changed in the instrument by the PLC
via the Download Function.
0 60
Hz
1 50
Hz
11
Data Mismatch
Active Flag
A flag set by the DEM whenever an active data base mismatch
condition exists. The exact mismatched parameters can be
determined by checking Device Status Flags #2. The Data Mismatch
flag will be cleared by the DEM whenever the condition causing the
mismatch is cleared.
0
No mismatch condition
1 Mismatch
condition
12 Spare
13
Bad PV Flag
A flag set by the DEM whenever the PV value is suspected or known
to be bad. After the PV value is good again, this flag will be cleared
by the DEM. Conditions causing this flag to be set include:
PV Update Timeout
: If the PV value has not been updated within
the timeout period, the flag is set
FTA Not Present:
If the FTA connector or the 24 VDC power supply
is disconnected, the flag will be set
SFC Write Detected:
If an SFC write to the instrument data base is
detected, the flag will be set. Note that in a redundant application,
the SFC Write Detected condition will be detected when a Download
command is executed from the other module or from the SFC unit.
Database Mismatch
: If the data base mismatch condition is
detected, the flag will be set
