TAC INET 7756 Process Control Unit.EN.pdf
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TAC I/NET
TM
7756
Process Control Unit
TAC’s 7756 Process Control Unit (PCU), part of the TAC I/NETTM
family of products, provides direct control and monitoring of
process functions from a “Peer-to-Peer” LAN based controller.
02
TAC I/NET 7756 Process Control Unit
Features
These process functions include
environmental control, trending, energy
management and process control,
which may be executed locally in a
standalone mode or “globalized” across
the Token Passing LAN. The 7756 PCU is
appropriate for commercial, institutional
and industrial applications.
ProdUCT AT A GLANCE
PCU Features
•
direct digital Control (ddC)
Controller Design
The 7756 PCU hardware is based on a double
layer baseplate. The lower layer provides a
30-point interface board while a 16-point interface
and processing board is mounted on the top
layer. The top layer is hinged down such that easy
access is provided to the lower interface terminals.
The controller features quick disconnect terminals,
downloadable irmware, an RS485 LAN port, one
or two RS-232 ports, a TTL port for a hand held
console and optional on-board modem drivers.
The inherent reliability of this design is further
enhanced with extensive transient protection,
automatic self-test features, and a iber optics
communications.
•
Both Adaptive and Self-Tuning PId Algorithms
•
Small “footprint”, high point count
•
High resolution I/o
•
Universal Inputs
– 12 bit and 16 bit Analog
– Supervised or Non-Supervised discrete
– Pulse
•
Configurable discrete output
– 24Vac voltage-sourcing triac
– Form C relays
– Floating, two-position and PWM control
•
Analog outputs
– 12 bit, 0-10VdC
•
Peer-to-Peer token passing LAN port, built-in
Control Functions
Direct Digital Control is provided by “Object
Modules” that are used to develop global logic
sequences. These Object Modules emulate
pneumatic/electronic components and may be
“linked” to create a wide variety of custom control
sequences. Object Modules are available for:
PID, Floating, High/Low Selector, 2 Position, Relay
(with timer), and Reset (dual input).
•
Automatic restart procedure upon power
loss/restoration
•
on-off-Auto Switches on all discrete outputs
– Prewired for status feedback
– LEd Indicators for output status
•
Look-Up tables for each Input/output
– 30 segment curve fitting
•
Analog transducer power supply, built-in
•
Local port for PC
Automatic Time Scheduling provides a full
year’s schedule, including multiple start/stop
times, special days and temporary inputs for each
load. Automatic Temperature Control, working
in conjunction with Automatic Time Scheduling,
self adjusts the heating or cooling control
providing normal temperature control, as well as
setup/setback control, including user-speciied
deadbands. Predictive Central Plant Start allows
plant startup based on inputs from one or more
space sensors.
•
Local port for Auto dial/Auto Answer modem
•
on-board trending of all I/o Points
•
Modular, object-oriented Programming
•
Extensive math/logic package
•
resident Programs for:
– Environmental Control with ddC
– Energy Management
– Historical data Collection
•
double-layer, small footprint, TAC baseplate
mounting
•
downloadable firmware
Schneider Electric
One High Street, North Andover, MA 01845 USA Telephone: +1 978 975 9600 Fax: +1 978 975 9674 www.schneider-electric.com/buildings
SDS-INET-PCU7756-A4.BU.N.EN.5.2006.0.00.CC
03
TAC I/NET 7756 Process Control Unit
Features
(continued)
Demand Limiting continuously monitors the rate
of electrical power consumption and predicts
the demand during each demand interval. If
the predicted demand exceeds a preset level,
controlled loads are shed or control set points
changed in a user-deined priority sequence.
As peak demand passes and electrical power
consumption decreases, the controller restores
the loads or setpoints to their normal routines.
Multiple power meters are supported in each 7756
PCU, with multiple loads speciied for each meter.
Maximum Off, Minimum On-Off, and seven levels
of shed priority ensure eficient Demand Limiting,
while protecting environmental control objectives.
Dimensional Drawing
Calculated Points are used to perform special
calculations required by the system. Calculated
points allow development of “equations” using
math, logic, Boolean, time, and other operators.
Event Initiated Control provides “IF-THEN-ELSE”
control sequences, with time delay options,
based on a state change or speciied state of
a point. Additional Functions include Runtime,
Consumption and Alarm Inhibit.
Lower I/o Board
High Resolution Look-Up Tables
Non-linear points may use a Look-Up table for
linearization. The table contains as few as 2 or as
many as 31 entries. Separation between entries
is user-deinable, allowing higher accuracy around
the primary area of interest. Look-Up tables may
be used with linear or non-linear signals to clamp
the end points to a speciic value.
Downloadable Firmware
Complete executable software is downloaded
through a locally connected PC, LAN or a modem.
This eliminates the need to visit the controller to
replace EPROMs for enhancements or revisions.
Schneider Electric
One High Street, North Andover, MA 01845 USA Telephone: +1 978 975 9600 Fax: +1 978 975 9674 www.schneider-electric.com/buildings
SDS-INET-PCU7756-A4.BU.N.EN.5.2006.0.00.CC
04
TAC I/NET 7756 Process Control Unit
Features
(continued)
Online editing Capability
The 7756 provides direct online edit capability
via a local, remote or portable PC for instant
modiication of all parameters. An operator with
the appropriate password authorization may
make changes “online” that are as simple as
time schedule changes or as comprehensive as
chiller optimization strategies. There is no need
to use archaic techniques that require compiling,
debugging or reloading the software. The operator
may observe the results of the changes instantly.
All operator entries on TAC I/NET PCs use menus
with self-prompting, ill-in-the-blank editors.
Context-sensitive help screens are available on the
PC downloadable irmware.
Model Number
Description
Comments
7756
Process Control Unit, 8UI (12 Bit),
24 UI (16 Bit), 8 do (relay), 8 Ao (0-10V,
12 Bits), 8 do (Triac), 24Vac
Baseplate mounted,
accomodates the
rS232 Communications
Expansion Board
rS232EXP
rS232 Communications Expansion
Board
Allows synchronous
communications
CBL072
Cable, Controller dB9 to Modem dB9,
6 ft (2m)
9-pin serial cable
CBL073
Cable, Controller dB9 to PC dB25,
6 ft (2m)
25-pin serial cable
C B L074
Cable, Controller dB9 to Modem dB25,
6 ft (2m)
25-pin modem cable
XFMr10
Transformer 120Vac Primary,
dual 24V/2A secondaries
XFMr11
Transformer 240Vac Primary,
dual 24V/2A secondaries
Trend Sampling
Trend Sampling is accomplished within the
controller independent of any PC workstation.
Each PCU can trend all connected points and
can store up to 1,440 samples of critical points
within the PCU. These samples can be archived to
multiple local or remote PC workstations and used
to generate custom reports.
TCoN127
7756 User Guide
Schneider Electric
One High Street, North Andover, MA 01845 USA Telephone: +1 978 975 9600 Fax: +1 978 975 9674 www.schneider-electric.com/buildings
SDS-INET-PCU7756-A4.BU.N.EN.5.2006.0.00.CC
05
TAC I/NET 7756 Process Control Unit
Speciications
7756 Process Control Unit
COMMUNICATION PORTS
Controller LAN
RS-485, 19,200 or 9600 baud,
SDLC, token-passing
Hand Held Console Port
RJ11 Modular, 1200 baud, TTL
RS-232 Port
PC @ 9600 baud (7801 tap function),
or Hayes direct-dial asynchronous
modem @ 1200, 2400 or 9600 baud
RS-232 Expansion Board Port
Supports synchronous modem, direct
or two-way dial SDLC (78061 or 78035
tap functions) at rates of 1200 to 19,200
baud. Requires optional plug-in module.
PROCESSOR
Processor
Zilog Z181
Clock/calendar
Battery-backed, includes seconds, minutes,
hours, day, month, year, leap year
Auto Dial Support
Telephone Numbers
8, stored in NOVRAM
Number Of Digits
31 per phone number
Supported
Phone, Beeper, Pager
MEMORY
EPROM
32K Bytes
Static RAM
256KBytes
NOVRAM
512Bytes
RAM Battery Backup
On-board Ni-cad, rechargeable.
Maintains RAM for 300 hours.
Firmware Binary Files
Downloadable to battery-backed RAM
Physical Description
Baseplate Dimensions
9.6˝ W x 11˝ L x 1.75˝ D
(244 mm x 280 mm x 44 mm)
RS232 Expansion Board Dimensions
3.2˝ L x 3.5˝ W
(81 mm x 89 mm)
Network Wiring Requirements
Controller LAN Length
5000 ft (1500 m) per segment.
25,000 ft (7600 m) with repeaters.
Cable Supported
Twisted pair, shielded. 22 AWG (0.324
mm2) or larger, 30 pF/ft or less between
conductors, 55pF/ft or less conductor to
shield, 85 to 150 Ohm impedance Belden
9841 or equivalent
Power Requirements
Controller
24Vac, +10%, 50/60 Hz, 40 VA (max)
Triac
Up to 24Vac, +10%, 50/60 Hz, 48 VA (max)
Operating Temperature
32°F to 122°F (0°C to 50°C)
Operating Humidity
10-90% RH, non-condensing
Schneider Electric
One High Street, North Andover, MA 01845 USA Telephone: +1 978 975 9600 Fax: +1 978 975 9674 www.schneider-electric.com/buildings
SDS-INET-PCU7756-A4.BU.N.EN.5.2006.0.00.CC
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