YOKOGAWA DPharp EJXC40A, Руководство пользователя

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<7. HART Communication>
7-16
IM 01C25W05-01EN
7.2.3.11 External Switch Mode
This function is used to enable or inhibit zero point
adjustment from the zero-adjustment screw on the
transmitter. The factory default setting is Enabled.
To change the setting, follow the procedure below.
• Recalling the external switch mode parameter
(Ext SW)
Recall
parameters
[Root menu] → Maintenance → DP trim
→ Ext SW
Enabled External zero adjustment enabled
Disabled External zero adjustment disabled
7.2.3.12 CPU Error Burnout Switch and
Hardware Write Protection
There are two slide switches on the transmitter CPU
assembly. One is used to set the burnout direction
for when CPU errors occur, and the other is used to
enable or disable the write-protect function.
If either the hardware write protection switch or
software write protection (see subsection 7.2.3.13)
is set to write-disable, writing is not possible.
HIGH LOW
H L
E
H L
F0709.ai
H L
E D
H L
E D
YES
(Write disabled)
NO
(Write enabled)
Burnout direction switch (BO)
Write protection switch (WR)
Burnout direction
Write protection
Switch
position
Switch
position
High pressure side (master)
transmitter CPU assembly
Slide switch
Burnout direction switch
Write protection switch
BO H L
WR E D
Figure 7.2.6 Output Setting for Errors
• For models with standard specifications or
optional code /C3
The burnout direction switch is set to high (H). If
an error occurs, the transmitter outputs a 110% or
higher signal.
• For models with optional code /C1 and /C2
The switch is set to low (L). If an error occurs, the
transmitter outputs a −2.5% or lower signal.
The 4 to 20 mADC burnout direction for when
CPU errors occur is displayed in the AO alm
typ parameter. Note that if an error occurs,
communication is not possible.
To check the 4 to 20 mADC output state for when
CPU errors occur, follow the procedure below.
• Recalling the analog output burnout direction
(AO alm typ) parameter
Recall
parameters
[Root menu] → Detailed setup →
Output condition → Analog output →
AO alm typ
Hi Set to off the scale on the high side
Lo Set to off the scale on the low side
7.2.3.13 Software Write-Protect
This function can be used to set a password to
prohibit parameter writing through communication
and protect the data set in the transmitter.
If a password (8 alphanumeric characters) is
entered and the write protection is set to Yes, the
transmitter cannot change the parameters.
To disable write protection, on the new password
input screen, enter eight spaces.
Note that the write protection can be disabled
temporarily in the following manner.
If a password is set, you can enter the password in
Enable wrt 10min to disable the protection for 10
minutes allowing the parameters to be changed.
• Recalling and setting software write protection
parameters
Recall
parameters
[Root menu] → Detailed setup → Wrt
protect menu →
Write protect Protection mode display
Yes: Write protection enabled
No: Write protection disabled
Enable wrt 10
min (method)
Write protection disabled for 10 minutes
New
password
(method)
Set a new password.