Emerson Rosemount 3051S Series Reference Manual page 39

Reference Manual
00809-0200-4801, Rev DA
FEATURES_SEL is used to turn on any supported features found in the FEATURES parameter. The default
setting of the Rosemount 3051S does not select any of these features. Choose one or more of the
supported features if any.
UNICODE
All configurable string variables in the Rosemount 3051S, except tag names, are octet strings. Either
ASCII or Unicode may be used. If the configuration device is generating Unicode octet strings, you must
set the Unicode option bit.
REPORTS
The Rosemount 3051S supports alert reports. The Reports option bit must be set in the features bit string
to use this feature. If it is not set, the host must poll for alerts. If this bit is set, the transmitter will actively
report alerts.
SOFT W LOCK and HARD W LOCK
Inputs to the security and write lock functions include the hardware security switch, the hardware and
software write lock bits of the FEATURE_SEL parameter, the WRITE_LOCK parameter, and the
DEFINE_WRITE_LOCK parameter.
The WRITE_LOCK parameter prevents modification of parameters within the device except to clear the
WRITE_LOCK parameter. During this time, the block will function normally updating inputs and outputs
and executing algorithms. When the WRITE_LOCK condition is cleared, a WRITE_ALM alert is generated
with a priority that corresponds to the WRITE_PRI parameter.
The FEATURE_SEL parameter enables the user to select a hardware or software write lock or no write lock
capability. To enable 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 will
reflect the state of the hardware switch. 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 shall be rejected.
The DEFINE_WRITE_LOCK parameter allows the user to configure whether the write lock functions (both
software and hardware) will control 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.
FEATURE_SEL FEATURE_SE
HW_SEL bit L SW_SEL bit
0 (off) 0 (off)
0 (off) 1 (on)
0 (off) 1 (on)
0 (off) 1 (on)
1 (on) 0 (off)
1 (on) 0 (off)
1 (on) 0 (off)
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 if set to 1 (on), the
SW_SEL bit is automatically set to 0 (off) and is read only.
Configuration
Security
switch
N/A 1 (unlocked)
N/A 1 (unlocked)
N/A 2 (locked)
N/A 2 (locked)
0
(1)
1 (unlocked)
(unlocked)
1 (locked) 2 (locked)
1 (locked) 2 (locked)
WRITE_LOCK
WRITE_LOCK Read/Write
Read only
Read/Write
Read/Write
Read/Write
Read only
Read only
Read only
Configuration
DEFINE_WRITE_LOCK
N/A
N/A
Physical
Everything
N/A
Physical
Everything
October 2016
Write access
to blocks
All
All
Function
Blocks only
None
All
Function
Blocks only
None
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