YOKOGAWA Dpharp EJX910A, Руководство пользователя

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IM 01C25R03-01E 7-2
7. IN-PROCESS OPERATION
7.3 Simulation Function
There are two simulation functions in EJX910A; one is
the function commonly offered in FOUNDATION
Fieldbus products to simulate input of each function
block for loop check, and the other is the flow simula-
tion function to simulate measured inputs for checking
the result of flow calculation.
The simulation function described in this section is the
former one. For flow simulation function, see ‘6.3.6
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
EJX910A 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 7.2 below.
Table 7.2 SIMULATE Parameter
T0702.EPS
Sub-
index
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 7.2 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 propaga-
tion of the status to the trailing blocks, generation of a
process alarm, and as an operation test for trailing
blocks.
F0702.EPS
Amplifier Assembly
1
2
O
N
"OFF" during operation
Not in use
SIM. ENABLE
Figure 7.2 SIMULATE_ENABLE Switch Position