PECO II, Inc. NETMACS II Manual
2.1.7 LOCAL PORT CONNECTION
A DB25 connector on the rear panel, J14, (Gateway) allows direct connection of a PC for initial IP
configuration.
2.1.8 ETHERNET CONNECTION (10BASE-T CONNECTIVITY)
The NetMACS II has the ability to be monitored and controlled remotely through the Ethernet
connection on the back of the unit.
2.1.9 24 UNIVERSAL MONITORING POINTS
The NetMACS II is equipped with 24 universal monitoring points that can be either analog or digital.
2.1.10 CHANNELS
The NetMACS II is equipped with 24 universal monitoring points to monitor either Digital or Analog
Inputs, as determined by the user. In addition, the NetMACS II has Digital Outputs (Form C
contacts) that reside on the interface PWB. The purpose of each channel is as follows:
2.1.10.1 Digital Input (DI) Channels
When a channel is selected as a digital input, it is used primarily for monitoring any alarms (GRD
or BAT) from the plant. These channels are typically used to monitor alarms, relay contacts from
local or remote equipment, etc.
NOTE:
For DI points, a voltage greater then 30VDC (up to 60VDC) is interpreted as a closure.
2.1.10.2 Analog Input (AI) Channels
When a channel is selected as an Analog Input, it is used primarily for monitoring any signals
(ranges) from the plant. These channels are typically used for direct temperature readings, AC
voltage (from a transducer), DC voltage and current from rectifiers, converters, etc. via
transducers and shunts, and other analog ranges. Maximum Input voltage to the Analog channels
is 60 VDC
2.1.10.3 Digital Output (DO) Channels
The NetMACS II interface PWB contains the (6) digital output relay channels; each channel
provides two Form C contacts. Typical applications include extending alarms or for control of
equipment.
2.2 OPTIONAL COMPONENTS
2.2.1 Optional Transducers
Several transducers are available, depending on the type, amplitude, and parameters to be
measured. These transducers must be utilized prior to connecting the output of the plant to the
NetMACS II Analog Input channels (maximum 60 VDC to the channels, when selected). PTC
(Positive Temperature Coefficient) thermistors are recommended for use with all DC voltage and
DC current channel inputs to protect the wiring. The installer is required to provide wire, splices,
and other lugs as required for installation.
Page 22 Issue
16, February 2007
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