Emerson Site Supervisor, Руководство пользователя

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Loop/Sequence Control Software Overview
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5.30 Loop/Sequence
Control
The Loop Sequence Control application’s main func-
tion is to read the value of an analog input, comparehone
the value to a setpoint, and generate a single analog output
value. This output value is represented in three different
forms: a single analog value from 0% to 100%, up to eight
digital stage outputs, and a digital pulse width modulation
output.
The output value(s) are generated by a PID Control
cell, which takes into account both the input’s
instantaneous value and its rate and direction of change.
The PID Control algorithm is similar to the PID algorithm
used by Pressure Control, except the Loop Sequence
Control application is designed to be used in a wider array
of applications.
How To Add a Loop/Sequence Control Device on
the Site Supervisor:
1. From Home screen, navigate to Main Menu>
Summaries and Floor Plans> Site Summaries>
Other, click the screen drop-down arrow on the
upper right of the screen, click
Add Controls
.
2. Select the Control or Application Type -
Loop/
Sequence Ctrl
, enter the Quantity, Control Name
and Serial Type. Note that Serial Type
information can be enter later. Click
Save
to add
the application.
3. A Confirmation box will appear saying that the
application is successfully added to the system,
click
Close
or
Edit these controls
.
4. The system will display the new application(s) on
the Site Summary screen.
5. Click the Loop/Sequence Control application
panel box to view the application.
6. The system will display the Loop/Sequence
Control application parameters.
7. The user can view and configure the properties of
the application by setting the Edit Mode to
ON
on the screen drop-down arrow on the upper right
of the screen.
5.31 XM Circuit Control
The XM Circuit Control application is an application
that provides supervisory control over the XM series of
case controllers (
Section 2.2.11, XM Series of Case Con-
trollers
). Although the XM case controllers can also be
controlled by the Case Control Circuit application in Site
Supervisor, specific configuration parameters in the Case
Control application apply and synchronize only with CC-
100, CS-100, and CCB case controllers. The XM Circuit
Control application is specifically designed to support XM
controllers and its parameters, and does not support other
types of case controllers.
This section of the manual covers both the program-
ming of an XM Circuit application and the process of
associating an XM670, XM678, or XM679 with an XM
Circuit application.
5.31.1 Associations
Case circuits that use XM670, XM678, or XM679 for
case control rely on the XM Circuit Control application in
the Site Supervisor to provide them the necessary set-
points, defrost scheduling, and other control parameters.
XM Circuits do not directly control temperature in the
case circuits; instead, the case controller controls tempera-
ture for each individual case based on the setpoint(s) sup-
plied to them by their associated XM Circuit.
Setup of a case-controlled refrigerated case system is a
two-fold process:
8. For each case circuit in the refrigeration system, a
separate XM Circuit application is created with
its own set of control parameters.
9. Each XM670, XM678, and XM679 is
associated
with an XM Circuit application in the Site Super-
visor. Association creates a network link between
the case controller and the application which sup-
plies the information necessary to control tem-
perature, defrost, lights, fans, and anti-sweat
heaters.
5.31.1.1 Case Circuit Association Support
The XM series of case controllers can be associated
with either an XM Circuit application or an existing Case
Circuit application. This allows users to upgrade the Site
Supervisor firmware without the need of any re-program-
ming of XM controller associations. However, the Case
Circuit application provides a limited functionality for any
XM controller. For full circuit functionality, it is recom-
mended that the XM controllers be associated with the
XM Circuit application.
5.31.1.2 Dual Association Not Supported
Once an XM case controller is associated to a circuit
(either an XM Circuit or a Case Circuit), it can no longer
be associated with any other circuit.
For example, if an XM controller is associated with a
Case Circuit application, it will not be available in the XM
Circuit association screen. Once the Case Circuit associa-
tion is removed, the XM controller will then be available