YOKOGAWA DPharp Series User Manual

<3. Operation>
3-12
IM 01C25T03-01E
(10) CPU Failure Burnout Direction and
Hardware Write Protect
(D25: BURNOUT)
There are two slide switches on the CPU assembly
board. One sets the burnout direction at CPU
failure, and the other sets a write protection function
which disables parameter changes through
the use of a handheld terminal or some other
communication method.
HIGH LOW
CPU assembly
Slide switch
Burnout direction switch
Write protection switch
Write Protection
Switch Position
Burnout Direction
Switch Position
BO H L
WR E D
H L
E D
H L
E D
H L
E D
H L
E D
Hardware write protection switch (WR)
Burnout direction switch (BO)
Burnout Direction
Write Protection
YES
(Write disabled)
NO
(Write enabled)
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The parameter D25: BURNOUT displays the status
of 4-20 mA DC output if a CPU failure occurs. In
case of a failure, communication is disabled.
Standardspecications
The burnout direction switch is set to HIGH. If a
failure occurs, the transmitter outputs a 110% or
higher signal.
Option code /C1
The burnout direction switch is set to LOW. If a
failure occurs, a –5% or lower output is generated.
• Example: Standard specifications
Slide switch position: H
D25: BURNOUT
HIGH
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• Example: Option code /C1
Slide switch position: L
D25: BURNOUT
LOW
(11) Software Write Protect
(D55: WRT PROTECT, D56: WRT
ENABLE, D57: NEW PASSWORD)
Transmittercongureddatacanbesavedbythe
write protect function. Write protect status (D55:
WRT PROTECT) is set from NO to YES when eight
alphanumerics are entered in the parameter D57:
NEW PASSWORD. Accordingly, the transmitter
does not accept any parameter changes. When
the eight alphanumeric password is entered in the
parameter D56: WRT ENABLE, the transmitter
accepts parameter changes during a 10 minute
period.
To cancel the transmitter for the software write
protection completely, use D56: WRT ENABLE to
rstreleasethewriteprotectfunctionandthenenter
eightspacesintheD57:NEWPASSWORDeld.
Thesoftwarewriteprotectiondoesnota󰀨ectthe
function of external zero adjustment screw.
To disable the external zero adjustment screw, set
the parameter J15: EXT ZERO ADJ to INHIBIT
before activating the software write protection.
a. Setting Password (D57: NEW PASSWORD)
Enter 1234ABCD.
Then status of parameter D55:
WRT PROTECT becomes YES.
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• Example: Set the password to 1234ABCD.
SET
D57:NEW PASSWORD
1234ABCD
CODE CAPS CLR ESC
SET
D57:NEW PASSWORD
1234ABCD
FEED NO OK
Press the key twice
to enter the setting.
Press the (OK) key.
b. Entering Password to Enable Parameter
Change (D56: WRT ENABLE)
Enter the password.
Parameter changes are available
for 10 minutes.
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• Example: Enter the password of 1234ABCD.
SET
D56:WRT ENABLE
1234ABCD
CODE CAPS CLR ESC
SET
D56:WRT ENABLE
PASS
FEED NO OK
Press the key twice
to enter the setting.
Press the (OK) key.

YOKOGAWA DPharp Series Specifications

General

Brand	YOKOGAWA
Model	DPharp Series
Category	Transmitter
Language	English