Emerson Site Supervisor, User Manual

Page: 19 / 141

The I/O Network RS485 I/O Network Boards and Peripherals
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2 RS485 I/O Net-
work Boards and
Peripherals
Site Supervisor has up to two RS485 network ports,
each of which may be configured as an I/O network or
MODBUS port.
2.1 The I/O Network
Most of the general purpose input and output
communications devices required by the Site Supervisor to
control refrigeration systems are connected via the
I/O
Network
. The I/O Network is a simple RS485 three-wire
connection that allows data interchange between input
boards, which read sensor values and digital closures,
output boards, which carry out commands from Site
Supervisor's control applications, and the Site Supervisor
itself. All boards and controllers manufactured by
Emerson Retail Solutions for communication with Site
Supervisor via RS485 are generally referred to as
I/O
boards
, and the network they are connected to is referred
to as the
I/O Network
(or
I/O Net
).
A COM port configured as I/O Net may connect with
up to 127 I/O boards. This network is used by the Site
Supervisor to read data from the input boards and to send
commands to the analog and digital output boards. Some
unit controllers, such as CCB case controllers and
MultiFlex RCBs, also communicate with the Site
Supervisor via the I/O Network.
2.2 I/O Board Names and
Terminology
There are many input, relay output, analog output, and
combination I/O boards available from Emerson Retail
Solutions for use with the Site Supervisor. However,
separate from the various MultiFlex unit controller
models, Site Supervisor only recognizes four different
types of I/O boards: 16AI, 8RO, 4AO, and 8DO. All Site
Supervisor-compatible I/O boards communicate with Site
Supervisor as if they are one or more of these types of
boards.
2.2.1 MultiFlex Boards
The MultiFlex line of control system boards provides a
wide variety of input, output, and smart control solutions,
all of which are based on a single universal hardware
platform. The board design uses flash-uploadable
firmware and plug-in expansion boards to configure the
base platform board and apply it for use as an input board,
relay output board, analog output board, or a combination
I/O board.
2.2.1.1 MultiFlex 16 Input Board
The MultiFlex 16 input board offers sixteen
combination analog/digital input points for use by Retail
Solutions Site Supervisor, Einstein, and REFLECS control
systems. The MultiFlex 16 may be used in retrofits with
no additional hardware or software setup or upgrades.Site
Supervisor
The MultiFlex 16 is designed to be 100% compatible
with the previous generation of Retail Solutions input
boards (the 16AI),
communicates with the site controller
via an RS485 connection to a REFLECS COM A&D
Network or an Site Supervisor I/O Network. Dip switches
on the board set the network ID (board number) and baud
rate.
The board also provides both +5VDC and +12VDC
output voltage points for use in powering transducers or
other input devices that require power.
The MultiFlex 16 has a Hand-held Terminal interface
Section 2.2.7, Hand-held Terminal (P/N 814-3110)
that
may be used by technicians to view the input voltage and
engineering unit values for each input point without need
of a voltmeter or front panel controller display.
Figure 2-1
- MultiFlex 16 Input Board