Yokogawa EJX930A - Manual (Page 56)

<7. In-Process Operation>
7-4
IM 01C25T02-01E
7.3 Simulation Function
The simulation function simulates the input of a
function block and lets it operate as if the data was
received from the transducer block. It is possible to
conduct testing for the downstream function blocks
or alarm processes.
A SIMULATE_ENABLE switch is mounted in
the transmitter amplifier. This is to prevent the
accidental operation of this function. When this is
switched on, simulation is enabled. (See Figure
7.2.) To initiate the same action from a remote
terminal, if REMOTE LOOP TEST SWITCH is
written to the SIM_ENABLE_MSG parameter
(index 1044) of the resource block, the resulting
action is the same as is taken when the above
switch is on. Note that this parameter value is
lost when the power is turned OFF. In simulation
enabled status, an alarm is generated from the
resource block, and other device alarms will be
masked; for this reason the simulation must be
disabled immediately after using this function.
The SIMULATE parameter of AI block consists of
the elements listed in Table 7.3 below.
Table 7.3 SIMULATE Parameter
Subindex Parameters Description
1 Simulate Status Sets the data status to
be simulated.
2 Simulate Value Sets the value of the
data to be simulated.
3 Transducer Status Displays the data status
from the transducer
block. It cannot be
changed.
4 Transducer Value Displays the data value
from the transducer
block.It cannot be
changed.
5 Simulate
En/Disable
Controls the simulation
function of this block.
1: Simulation disabled
(standard)
2: Simulation started
When Simulate En/Disable in Table 7.3 above is
set to 2, the applicable function block uses the
simulation value set in this parameter instead of
the data from the transducer block. This setting can
be used for propagation of the status to the trailing
blocks, generation of a process alarm, and as an
operation test for trailing blocks.
F0702.ai
Amplifier Assembly
1
2
O
N
"OFF" during operation
Write lock switch
SIMULATE_ENABLE
Figure 7.2 SIMULATE_ENABLE Switch Position
7.4 Write lock (Write-protect)
function
The transmitter is provided with a write lock (write-
protect) function to restrict write operations to
blocks and prevent inadvertent writing of parameter
data. To enable this function, use the write lock
switch (Hard W Lock) or the WRITE_LOCK (index
1034) (Soft W Lock).
The CPU assembly of the transmitter is provided
with a write lock switch (switch 2 in Figure 7.3).
Setting switch 2 to On activates the write lock
function, to prevent changes to block parameters
of WRITE_LOCK_LEVEL (index 1064). Table 7.4
shows how WRITE_LOCK_LEVEL relates to the
block targeted by write lock. In the factory default
setting, WRITE_LOCK_LEVEL is “2” (preventing
writing to the transducer block, resource block and
function block). To enable the switch lock function,
set "Hard W Lock” (bit 4) of FEATURE_SEL (index
1018) to “1” (On). (The factory default for “Hard W
Lock” (bit 4) is “0” (Off).