Reference Manual
00809-0100-4021, Rev FB
August 2011
Rosemount 3144P
4-6
FOUNDATION Fieldbus
The FEATURE_SEL parameter enables the user to select a hardware or
software write lock or no write lock capability. To use the hardware security
function, enable the HW_SEL bit in the FEATURE_SEL parameter. When this
bit has been enabled the WRITE_LOCK parameter becomes read only and
reflects the state of the hardware switch. In order to enable the software write
lock, the SW_SEL bit must be set in the FEATURE_SEL parameter. Once this
bit is set, the WRITE_LOCK parameter may be set to “Locked” or “Not
Locked.” Once the WRITE_LOCK parameter is set to “Locked” by either the
software or the hardware lock, all user requested writes as determined by the
DEFINE_WRITE_LOCK parameter will be rejected.
The DEFINE_WRITE_LOCK parameter allows the user to configure whether
the write lock functions (both software and hardware) that controls writing to
all blocks, or only to the resource and transducer blocks. Internally updated
data such as process variables and diagnostics will not be restricted by the
security switch.
The following table displays all possible configurations of the WRITE_LOCK
parameter.
FEATURES_SEL
FEATURES_SEL turns on any of the supported features. The default setting
of the 3144P does not select any of these features. Choose one of the
supported features, if any.
MAX_NOTIFY
The MAX_NOTIFY parameter value is the maximum number of alert reports
that the resource can send without getting a confirmation, corresponding to
the amount of buffer space available for alert messages. The number can be
set lower to control alert flooding, by adjusting the LIM_NOTIFY parameter
value. If LIM_NOTIFY is set to zero, then no alerts are reported.
PlantWeb
™
Alerts The alerts and recommended actions should be used in conjunction with
“Operation” on page 4-21.
The Resource Block acts as a coordinator for PlantWeb alerts. There will be
three alarm parameters (FAILED_ALARM, MAINT_ALARM, and
ADVISE_ALARM) which contain information regarding some of the device
errors detected by the transmitter software. There will be a
RECOMMENDED_ACTION parameter used to display the recommended
action text for the highest priority alarm and a HEALTH_INDEX parameters (0
- 100) indicating the overall health of the transmitter. FAILED_ALARM has the
highest priority, followed by MAINT_ALARM, and ADVISE_ALARM is the
lowest priority.
FEATURE_SEL
HW_SEL bit
FEATURE_SEL
SW_SEL bit
SECURITY SWITCH WRITE_LOCK
WRITE_LOCK
Read/Write
DEFINE_WRITE_LOCK
Write access
to blocks
0 (off) 0 (off) NA 1 (unlocked) Read only NA All
0 (off) 1 (on) NA 1 (unlocked) Read/Write NA All
0 (off) 1 (on) NA 2 (locked) Read/Write Physical Function
Blocks only
0 (off) 1 (on) NA 2 (locked) Read/Write Everything None
1 (on) 0 (off)
(1)
0 (unlocked) 1 (unlocked) Read only NA All
1 (on) 0 (off) 1 (locked) 2 (locked) Read only Physical Function
Blocks only
1 (on) 0 (off) 1 (locked) 2 (locked) Read only Everything None
(1) The hardware and software write lock select bits are mutually exclusive and the hardware select has the highest priority. When the HW_SEL bit is set to
1 (on), the SW_SEL bit is automatically set to 0 (off) and is read only.
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