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Communications Write Enable
Enables/disables the changing of parameter values via the RS485 communications link, if
the communications option is installed.
Possible settings are read only or read/write.
Display code = $".% , default setting = r_ Ww (read/write).
Controller
An instrument that can control a Process Variable, using either PID or On-Off control
methods. Alarm outputs are also available that will activate at preset PV values, as are other
options such as PV retransmission and Serial Communications.
Also refer to Alarm Operation, Indicator, Limit Controller, On-Off Control, PID, Process
Variable, Retransmit Output and Serial Communications.
CPU
This stands for Central Processing Unit and refers to the onboard microprocessor that
controls all of the measuring, alarm and control functions of the instrument.
Current Proportioning Control
Current proportioning control can be implemented on units configured with linear current or
voltage output(s). It provides a 4 to 20mA, 0-20mA, 0 to 5V, 0 to 10V or 2 - 10V DC PID
output. On-Off control should not be used with Current proportioning control.
Also refer to On-Off Control, PID, Primary Proportional Band, Rate, Secondary Proportional
Band and Time Proportional Control.
Cycle Time
For time proportioning outputs, it is used to define time period over which the average on vs.
off time is equal to the required PID output level. $#2 , $#3 and $#4 are available when
option slots 1, 2 or 3 are defined as time proportioning output types. The permitted range of
value is 0.5, 1, 2, 4, 8, 16, 32, 64, 128, 256 or 512 seconds. Shorter cycle times will give
better control, but at the expense of reduce life when used with an electromechanical control
device (e.g. relays or solenoid valves).
Display codes = $#2 , $#3 and $#4 , default value = 32.
Also refer to PID and Time Proportioning.
Deadband
- Refer to Overlap/Deadband.
Derivative
- Refer to Rate.
Deviation Alarm 1 Value Type
This is applicable only if Alarm 1 is selected to be Deviation Alarm. A positive value
(Deviation High) sets the alarm point above the current actual setpoint, a negative value
(Deviation Low) sets it below. If the process variable deviates from the setpoint by a margin
greater than this value, alarm 1 becomes active.
Display code = D5+2 , Default value = 5.
Also refer to Alarm Operation and Deviation Alarm 2 Value.
59305, Issue 5 – March 2005
- DIN Controllers & Indicators - Product Manual
Type: Controller Definition
Type: Controller Definition
Type: Controller Definition
Type: Controller Parameter
Type: Controller Parameter
Type: General Parameter
Glossary
Type: General Definition
Type: General Definition
Page 111
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