Yokogawa FVX110 - Manual (Page 67)

<9. In-Process Operation>
9-4
IM 01S01C01-01EN
9.3 Device Diagnostic
Simulation Function
It is possible to conduct testing for the downstream
function blocks or alarm processes.
A SIMULATE_ENABLE switch is mounted in the
FVX110 amplifier. This is to prevent the accidental
operation of this function. When this is switched
on, simulation is enabled. (See Figure 9.4.) 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. 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 FD_SIMULATE parameter located in the
Resource Block consists of the elements shown in
Table 9.3.
Table 9.3 FD_SIMALATION parameters
Subindex Parameters Description
1 Diagnostic
Simulate Value
Sets alarm bits that
perform simulation.
When Sub-index3:
Enable becomes
disabled, Sub-index2:
Diagnostic Value is
displayed here.
2 Diagnostic Value This parameter displays
actual instrument
diagnostics states at
all times not simulation
diagnostics alarms.
3 Enable It controls the simulator
function.
1: Simulation inhibited
(default setting)
2: Simulation start
Turn on the simulator function either by the
SIMULATE_ENABLE switch or by setting SIM_
ENABLE_MSG in the Resource Block to ON when
“2” is set in Enable for the Sub-index parameter
in Table 9.3 to generate the alarm bits set in the
Sub-index parameter Diagnostic Simulate Value.
Use this function to check whether or not the field
instrument can correctly generate diagnostics
alarms.
1
2
O
N
O
N
"OFF" during operation
SIM. ENABLE
Amplifier Assembly
F0904.ai
Figure 9.4 SIMULATE_ENABLE Switch