Future Design MCTB 4.3, Руководство пользователя

Страница: 29 / 240

MCTB
29
Three Loop When three loop is selected, the MCTB will be configured as a three-loop
controller. Three B42 process loop controls must be attached and set for
communications addresses of 1, 2 and 3 for proper operation.
The
Soft Alarms field is used to enter the number of soft alarms that will be provided on the system. A soft
alarm is an alarm without a physical control output. It is a software-based alarm that can be used to alert an
operator that a process has exceeded desired operating conditions. The MCTB is capable of providing up to
ten soft alarms. When at least one soft alarm is entered, the Soft Alarm Configuration menu item is enabled
and the mode of operation for the soft alarm(s) can be specified. See section
4.5 Soft Alarm Configuration for
more information.
The
Monitor Points field is used to enter the number of monitor points that will be provided on the system.
The MCTB is capable of providing up to eight monitor points via the external Smart IO module. When at least
one monitor point is entered, the Monitor Configuration menu item is enabled and the input(s) can be defined.
See section
4.4 Monitor Configuration for more information.
The
Math/Logic field is used to enter the number of math/logic equations that are to be used. The MCTB is
capable of providing up to 20 user configurable equations. When at least one math/logic equation is entered,
the Math/Logic Configuration menu item is enabled and the equations can be entered. See section
4.6
Math/Logic Configuration for more information.
The
Outputs Off on Input Error selection button is used to disable logic outputs of all configured logic
equations if any input to the system is in a fault condition. This includes all loops, limits and monitor points.
The selection is a global selection, meaning it affects all logic equations even if they do not use the specific
input that is in an error condition.
4.2 Loop Configuration
The Loop Configuration screen is accessed from the Setup menu. The screen provides access to all loop
control board settings. When the selected control type requires more than one loop control, the left/right scroll
buttons will be provided at the top right of the screen. These buttons can be used to scroll through all available
loop controls in order to view/edit settings for each.
The model and version of the loop control attached will be shown in the scroll list header. To view all of the
available settings, simply swipe up or down on the screen to scroll through the list items. To edit a value, tap
the row for the desired item. If the entry is a simple numeric value, the number entry pad will be shown. If the
item has multiple selections to choose from, a list of individual selections for the item will be shown. For a
comprehensive list of all loop control board settings, their ranges and factory default values see the B42 product
manual.