Yokogawa EJA220A - Manual (Page 44)

IM 01C21C01-01E 8-12
8. BRAIN TERMINAL BT200 OPERATION
(10) Output Status Display/Setup when a CPU
Failure (D52: BURN OUT)
This parameter displays the status of 4 to 20 mA DC
output if a CPU failure occurs. In case of a failure,
communication is disabled.
Setting of HIGH or LOW is enabled. This is done with
the pin (CN4) on the CPU assembly. See Chapter 3 for
details.
Standard specifications
The parameter is set to HIGH. If a failure, the transmit-
ter outputs the signal of 110% or higher. The parameter
D53: ERROR OUT is set to HIGH from the factory.
Optional code/C1
The parameter is set to LOW. If a failure, output which
is –5% or lower is generated. The parameter D53:
ERROR OUT is set to LOW from the factory.
• Example: Standard specifications
pin (CN4) position: H
D52: BURN OUT
HIGH
F0825.EPS
• Example: Optional code/C1
pin (CN4) position: L
D52: BURN OUT
LOW
(11) Output Status Setup when a Hardware
Error Occurs (D53: ERROR OUT)
This parameter allows the setting of the output status
when a hardware error occurs. The following three
selections are available.
(a) HOLD; Outputs the last value held before the error
occurred.
(b) HIGH; Outputs an output of 110% when an error
has occurred.
(c) LOW; Outputs an output of –5% when an error has
occurred.
Note: A hardware error means CAP MODULE FAULT of Er.01 or
AMP MODULE FAULT of Er. 02 which are shown in 8.5.2
“Errors and Countermeasures.”)
• Example: Set the output status to LOW when
a hardware error occurs.
ESC
SET
D53:ERROR OUT
HIGH
< HIGH>
< LOW>
< HOLD> Use the or key
to select LOW.
Press the key twice to
enter the setting.
F0826.EPS
(12) Range Change while Applying Actual
Inputs (H10: AUTO LRV, H11: AUTO
HRV)
This feature allows the lower and higher range values
to be set up automatically with the actual input applied.
If the lower and higher range values are set, C21:
LOW RANGE and C22: HIGH RANGE are changed
at this same time.
Follow the procedure in the figure below.
The measurement span is determined by the higher and
lower range values. Changing the lower range value
results in the higher range value changing auto-
matically, keeping the span constant.
• Example 1: When changing the lower range
value to 0.5 kPa for the present
setting of 0 to 30 kPa, take the
following action with input pressure
of 0.5 kPa applied.
FEED NO OK
SET
H10:AUTO LRV
0.5000 kPa
DATA DIAG PRNT ESC
PARAM
H10:AUTO LRV
0.5000 kPa
H11:AUTO HRV
30.500 kPa
H60:SELF CHEC
GOOD
ESC
SET
H10:AUTO LRV
0 kPa
+ 0
F0827.EPS
The higher range value is changed
keeping the span constant.
Parameters C21 and C22 are
changed at the same time.
Press the key twice.
The lower range value is changed
to 0.5 kPa.
Press the (OK) key.
Note that changing the higher range value does not
cause the lower range value to change but does change
the span.