Yokogawa EJX115A - Manual (Page 43)

<7. In-Process Operation>
7-2
IM 01C25T04-01EN
7.2.3 Alarm Mask Function
Table 7.1 shows the parameters related
to the masking of alarms. Users can mask
DIAGNOSIS_EXTENSION by setting the Diagnosis
Mask Extension RW (DIAGNOSIS_MASK_
EXTENSION_RW) parameter. DIAGNOSIS_
EXTENSION displays the results of masking.
For details of DIAGNOSIS_EXTENSION, see Table
8.3.
The DIAGNOSIS_MASK and DIAGNOSIS_MASK_
EXTENSION are a read-only parameter to display
bits which are supported by the device.
• Procedure to call up the display
DTM [Menu] → Device → Configuration →
Query Device → Query Device PB →
EDD [Menu] → Device → Query Device →
Physical Block → Index60 - →
Diagnosis Mask Extension RW
Table 7.1 Mask parameter of alarm in the physical block
Index Parameters Description Valid Range Initial Value
31 DIAGNOSIS_MASK Supported bit of DIAGNOSIS Read Only 0x00, 0x98, 0x0f,
0x80
32 DIAGNOSIS_MASK_
EXTENSION
Supported bit of DIAGNOSIS_EXTENSION Read Only 0xff, 0x3c, 0x37,
0xf2, 0x00, 0x00
62 DIAGNOSIS_MASK_
EXTENSION_RW
Set masked DIAGNOSIS_EXTENSION.
When DIAGNOSIS_MASK_EXTENSION_RW-bit is ON and its
alarm or warning occurs, its DIAGNOSIS_EXTENSION-bit is ON.
0: Off,
1: On
0xff, 0x3c, 0x33,
0xf0, 0x00, 0x00
7.3 Simulation Function
It is possible to conduct testing for the downstream
function blocks or alarm processes. Following
description is how to use and how to set parameters
of this function.
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 Figure7.2.)
To initiate the same action from a remote terminal,
if REMOTE LOOP TEST SWITCH is written to the
SIM_ENABLE_MSG parameter (index 51) of the
physical block, the resulting action is the same as is
taken when the above switch is on. In the simulation
status, an alarm is generated from the physical
block, and other device alarms will be masked;
for this reason the simulation must be disabled
immediately after using this function.
F0702.ai
Amplifier Assembly
1
2
O
N
"OFF" during operation
Write lock switch
SIMULATE_ENABLE
Figure 7.2 SIMULATE_ENABLE Switch Position