D8 Series User’s Guide
Chapter 6: Menu and Parameter Reference
104
Keypad Lock
l
Keypad lock
r
b
off
Set this parameter to
on
to disable the
.
key on the keypad. This restricts access to the operator
parameters from the controller keypad.
Values:
on
(1) or
off
(0). Values in parentheses are for communications, and are stored as the
second bit of the system command word, so set or read only that bit.
Default:
off
(0)
DeviceNet™ Object:
Global (6B hex)
Thermocouple Short Alarm
l
TC short alarm
r
b
disabled
Choose a digital input to enable for thermocouple short detection. Install a device that connects the
input to controller common when the process power is on. A thermocouple short is detected if the
process power is on but the temperature does not rise as expected.
If a thermocouple short is detected, the controller puts the loop in manual mode at the output power
level specified by the
Sensor fail heat output
or
Sensor fail cool output
parameter in the
Output
menu.
Values:
enabled by D/I1
to
enabled by D/I8
(1 to 8) or
disabled
(0). Values in parentheses are for
communications.
Default:
disabled
(0)
DeviceNet™ Object:
Global (6B hex)
AC Line Frequency
l
AC line freq
r
b
60 Hz
Specify the ac line frequency. The controller uses this information for correct timing of distributed
zero-crossing (DZC) output signals and for optimum filtering of analog inputs.
If you edit this parameter, you must switch power to the controller off, then back on, in order for the
change take effect.
Values:
50 (1) or 60 (0) Hz. Values in parentheses are for communications.
Default:
60 Hz (0)
DeviceNet™ Object:
Global (6B hex)
