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INTRODUCTION
The PM7600B software must be programmed or config-
ured to define analog and digital inputs and outputs con-
nected to the device. With this configuration, the W7600
provides discharge air (DA) temperature and static pressure
control in VAV applications. The PM7600B software al-
lows the user to customize the control system for many
different types of VAV applications. Because of this appli-
cation versatility, provisions were made to configure the
available analog and digital inputs and outputs to a given
system using an IBM® PC AT™ or Honeywell approved
compatible computer. Refer to the ZM7601/ZM7603 User's
Guide for further details. For specific instructions, see the
Programming W7600 Controllers section of that manual.
Before reviewing the optional input and output configu-
ration parameters, it is necessary to understand some terms
used with this type of control configuration. The terms and
definitions listed below are used throughout this specifica-
tion.
Control Number—Number assigned within the
PM7600B to an analog or digital input or output. This
number is assigned by the control algorithm and used to
identify or label a specific input or output within the frame-
work of the PM7600B software. For example, input control
number 129 is a compressor high pressure monitoring
point. Note that the control number does not necessarily
correlate with the actual W7600/W7601 input/output ter-
minal. This control number is described in the Input and
Output Options section.
Digital Input—A dry (no voltage) contact closure used
to indicate an on/off condition. The control algorithm inter-
prets the condition to generate an alarm or integrate some
function into the control algorithm. For example, a digital
input could be a smoke alarm contact closure or a zone
unoccupied override input from a space sensor.
Analog Input—A sensor or transducer input to the W7600
that measures an analog variable. Analog inputs to the
W7600 can be resistance (0 to 4500 ohms), voltage (0 to 10
Vdc), or current (0 to 20 mA).
Digital Output—The W7600 digital output signals an
R7600 Relay Module to switch a spdt pilot duty relay.
These relay outputs may be used to drive such loads as fan
contactors, compressor contactors, or stages of electric
heat. The digital outputs may also be used with Honeywell
Series 60 type floating actuators for floating control of
dampers.
Analog Output—A modulating current output from the
W7600 analog output terminal that is wired to a damper or
PM7600B Input and Output Options
5
PM7600B INPUT AND OUTPUT OPTIONS
valve actuator. The current output is a 0 to 20 mA signal but
can be converted to a 0-15 Vdc signal by adding a dropping
resistor. The desired analog output range can be defined
within the 0-20 mA total range; for example, the analog
output can be defined to operate from 4 to 16 mA or from 7
to 15 mA.
Remote Digital Input—The remote digital input point is
not an actual physical point. It may be used as a source or
destination for digital input information from the CNAP
Network; specifically, the Q7640. The remote digital input
point functions like a regular digital input point, but it is
only a memory location in the W7600. There are 32 remote
digital input points for each W7600.
Remote Analog Input—The remote analog input point is
not an actual physical point. It may be used as a source or
destination for analog input information from the CNAP
Network; specifically, the Q7640. The remote analog input
point functions like a regular analog input point, but it is
only a memory location in the W7600. There are 48 remote
analog input points for each W7600.
VAV NETWORK FUNCTIONS
The VAV control algorithm contains several variables
and functions that may be used in conjunction with other
controllers on the CNAP Network. Table 1 is a list of
variables available to the CNAP Network and a brief de-
scription of the intended network usage. (Note that the
VAV control is a CNAP satellite because network func-
tions require a CNAP master controller to collect and pass
the data.)
Using network functions requires the Q7640 Network
Interface Unit for datasharing. Demand limit control re-
quires a W7600G Building DDC Controller with a kilowatt
sensing input and a start/stop program configured to pro-
vide the Restore/Shed digital input via the network.
An additional network feature is the ability to write to
unused digital outputs on the W7600 using the network
controlled digital outputs (control no. 248-255). This can
be used to control lighting, exhaust fans or other items
based on a time schedule from another controller on the
CNAP Network.
The View feature of the ZM7601/ZM7603 software
allows the user to view the status of individual Input/Output
points and the status of the Air Handling Unit (AHU)
controlled by the W7600 Control Module. See the ZM7601/
ZM7603 Software User's Guide for more information on
the View feature.
PM7600B
63-4309—2
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