ePAQ-9150
Remote Terminal Unit
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Copyright © 2016 QEI
Section 1
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Section 1
1.1 General Description
The ePAQ-9150 Remote Terminal Units are special purpose microprocessor based
subsystems used for control, supervision, data acquisition and data reduction. These
systems are part of the SENTINEL-21 product line and can perform all the functions
required by present day SCADA systems used in distributed input/output (I/O) and
substation applications with minimal custom engineering and hardware.
The ePAQ-9150 employs the 6CPP6 Central Processor Panel and is intended for
applications where a fixed, small number of status, analog and control points are
required, such as circuit breaker or line switch monitor and control or anywhere in a
location where analog measurements are handled by Intelligent Electronic Devices
(IEDs).
The ePAQ-9150s are intelligent devices designed to collect status/alarm, and analog
values continuously, and optionally provide analog outputs and perform controls with or
without supervision by the TDMS-Plus Master Station (also otherwise known as the
host). ePAQ-9150s also serve as data concentrators for other IEDs in a (substation)
network. Communications with the host is in a master/slave mode. The ePAQ-9150
transmits data only when the host requests it. Controls originated at the host are
performed on a select/check-back/execute mode.
The ePAQ-9150 builds its database by scanning status inputs, reading analog inputs
and converting them to digital values, and by counting pulse inputs (accumulators). It
also compares present status, and analog values to previous values to determine if
upsets (i.e. changes) have occurred. The ePAQ-9150 time tags events which the
host can retransmit to the system’s Master Station, where sequence of events (SOE)
can be determined. It can, optionally, if so programmed, perform algebraic and logical
calculations, local close loop controls and PID loop controls. In addition to this, other
protocols can be programmed for communications with foreign Master Stations.
The ePAQ-9150 can be configured for communications through a vast array of
communication ports ranging from RS-232 or RS-485 serial ports and even has a
built-in 202T modem for legacy applications. Optionally it can be equipped with a
network interface card (6NIA1) for communications over Ethernet networks using the
TCP/IP protocol, either via industry standard twisted pair of fiber-optic interfaces.
The ePAQ-9150 equipment can be mounted in any industry standard equipment
rack. The required DC operating voltage is supplied by a commercial power supply
which converts the input power (AC or DC) to 12 VDC. If needed, the ePAQ-9150
can be equipped with a battery for operation during power outages.
Link
Device
ePAQ-
9150
IEDs
Analogs
Status
Controls
RS-232/RS-485
202T or Ethernet
To Master
Station
