YOKOGAWA DpharpEJX vigilantplant EJX Series - 6. EXPLANATION OF BASIC ITEMS

IM 01C25T02-01E
6-1
6. EXPLANATION OF BASIC ITEMS
6. EXPLANATION OF BASIC ITEMS
6.1 Outline
This chapter describes the SENSOR transducer block,
the LCD transducer block, and the AI function block
and explains basic parameter settings. Refer to Appen-
dixes for other function blocks, LM function, and
software download function.
6.2 Setting and Changing Param-
eters for the Whole Process
IMPORTANT
Do not turn off the power immediately after
setting. When the parameters are saved to the
EEPROM, the redundant processing is executed
for an improvement of reliability. If the power is
turned off within 60 seconds after setting is
made, the modified parameters are not saved
and the settings may return to the original
values.
Block mode
Many parameters require a change of the block mode
of the function block to O/S (Out of Service) when
their data is changed. To change the block mode of the
function block, its MODE_BLK needs to be changed.
The MODE_BLK is comprised of the four sub-
parameters below:
(1) Target (Target mode):
Sets the operating condition of the block.
(2) Actual (Actual mode):
Indicates the current operating condition.
(3) Permit (Permitted mode):
Indicates the operating condition that the block
is allowed to take.
(4) Normal (Normal mode):
Indicates the operating condition that the block
will usually take.
6.3 SENSOR Transducer Block
The SENSOR transducer block is in between the
sensor and the AI function blocks. It calculates
pressure/differential pressure, static pressure, and
capsule temperature from sensor signals. Then it
performs damping and range checks for the measured
values of these three variables and sends signals to the
AI function block.
6.3.1 Functional block
Figure 6.1 presents the functional block of the SEN-
SOR transducer. The calculated values of pressure/
differential pressure, H-side static pressure, L-side
static pressure, and capsule temperature are assigned to
PRIMARY_VALUE, SECONDARY_VALUE,
TERTIARY_VALUE, CAP_TEMP_VAL, and
AMP_TEMP_VAL, respectively. Measured values
output to the AI function blocks are selected by the
Channel parameter of those blocks.
6.3.2 Block Mode
The Block modes permitted for the SENSOR trans-
ducer block are Automatic (Auto) and Out of Service
(O/S). The mode must be set to Auto under normal
operating conditions, and to O/S when making changes
to an important parameter. For parameters that can
only be changed in the Auto and O/S modes, refer to
the parameter list for the SENSOR Transducer block in
Chapter 9.
F0601.EPS
PRIMARY_VALUE
(Channel1)
Sensor
signals
SECONDARY_VALUE
(Channel2)
TERTIARY_VALUE
(Channel3)
CAP_TEMP_VAL
(Channel4)
Pressure
/differential
pressure
calculation
Static
pressure
calculation
Damping
processing
Damping
processing
Historical
records
Equipment
information
Range
check
Range
check
Range
check
Adjust-
ment
Adjust-
ment
Unit
Check
Unit
Check
H-side
static
pressure
L-side
static
pressure
Unit
Check
Capsule
temperature
calculation
AMP_TEMP_VAL
(Channel5)
Range
check
Unit
Check
Amplifier
temperature
calculation
Figure 6.1 SENSOR Transducer Functional Block