Rosemount 5600 Series, Справочное руководство

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Reference Manual
00809-0100-4024, Rev BA
September 2005
8-5
Rosemount 5600 Series
The WRITE_LOCK parameter limits access to modify parameters within the
block 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 jumper. 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 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 error logs will not be restricted by the security
jumper.
Table 8-3 displays all possible configurations of the WRITE_LOCK parameter.
Table 8-3. WRITE_LOCK
parameter
Figure 8-2. 5600 Foundation
Fieldbus Electronic Board
FEATURE_SEL
HW_SEL bit FEATURE_SEL
SW_SEL bit
SECURITY JUMPER WRITE_LOCK
WRITE_LOCK
Read/Write
0 (off) 0 (off) NA 1 (unlocked) Read only
0 (off) 1 (on) NA 1 (unlocked) Read/Write
0 (off) 1 (on) NA 2 (locked) Read/Write
1 (on) 0 (off)
(1)
(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.
0 (unlocked) 1 (unlocked) Read only
1 (on) 0 (off) 1 (locked) 2 (locked) Read only
Write_Lock Switch
5600_13_AA.EP
S
F
OUNDATION
Fiel
dbus