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DCP200 Profile Controller & Recorder - Product Manual
Page 146 Glossary 51-52-25-150, Issue 1 – April 2009
Main Menu
The top-level menu that allows access to operation mode as well as all other menus. These
are: configuration mode, profiler setup and recorder menus, the setup wizard, supervisor
mode and the tuning and USB menus. Most menus require an unlock code to gain access.
Refer to the Main Menu information in the Configuration & Use section.
Also refer to: Configuration Mode, Lock Codes, Operation Mode, Profiler Setup Menu,
Recorder Menu, Setup Wizard, Supervisor Mode, Tuning Menu and USB Menu.
Manual Loop Alarm Time
The loop alarm time used when a loop alarm is defined to have a manually set time or
whenever On-Off control is selected. This parameter determines the duration of the output
saturation condition after which the loop alarm will be activated.
Settings = 1 sec to 99 mins 59 sec. Default value = 99:59.
Also refer to: Loop Alarm, and On-Off Control.
Manual Mode
If Manual Mode is enabled/disabled (from the control configuration sub-menu, or the
Auto/manual screen in operation mode if it is available) it allows the controller to switch
between automatic and manual control modes. Auto/Manual Mode can also be switched
using a digital input if one has been configured for this function. Switching between automatic
and manual modes is achieved using “bumpless transfer”.
Manual Mode operates as follows:
The setpoint legend is replaced by the word MAN and setpoint value is replaced by a %
output power value. This value may be adjusted using the or keys. The power value
can be varied from 0% to 100% for controllers using single control type, and -100% to +100%
for controllers using dual control type. It is possible to use a controller as a permanent
“Manual Station” by selecting Manual Control in the control configuration sub-menu.
Caution: Manual Mode should be used with care because the power output level is set by
the operator, therefore the PID algorithm is no longer in control of the process. The operator
MUST maintain the process at the desired level manually. Manual power is not limited by the
Power Output Limits.
Also refer to: Bumpless Transfer, Control Configuration, Control Type, Operation Mode, PID,
and Power Output Limits.
Master & Slave Controllers
The terms master and slave are used to describe the controllers in multi-zone applications
where one instrument controls the setpoint of another. These can be simple Setpoint
Master/Slave applications where the master controller transmits its setpoint to the slaves via
serial communications, or retransmits it as an analogue DC linear output signal. If serial
comms are used, the master controller must be able to act as a communications master
device and the slave must have a compatible communications option fitted. If DC linear
retransmission is use, the slave controller must have a matching a remote setpoint input. It is
possible to apply an offset to each zone if the slave has a Setpoint offset parameter or by
offsetting it’s remote setpoint input (or adjusting the scaling of this input).