ABB Totalflow NGC8206 Manuel D'utilisation page 292

Real Time Data Base
Real Time Operating
System
Recharge/Charge
Recommended
Standard 232
Recommended
Standard 422
Recommended
Standard 485
Record
Register
Relay
Remote
Remote Controller,
XSeries.
Page B–48
The SCADA system has an in-memory RTDB for the data it collects
from various devices. Real-time generally means that the data is
acquired often enough that the user can make operational changes to
the process while it is still useful to do so. On a factory floor, this can be
in milliseconds. For remote devices which may require a couple of
hours of drive time to reach, real-time can be thought of in tens of
minutes or even hours. The data base can meet either of these
requirements.
Any operating system where interrupts are guaranteed to be handled
within a certain specified maximum time, thereby making it suitable for
control of hardware in embedded systems and other time-critical
applications. RTOS is not a specific product but a class of operating
system.
The conversion of electrical energy, provided in the form of a current
from an external source (charger), into chemical energy within a
cell/battery.
This is the standard interface for full-duplex data communication
conducted with two way independent channels. It employs unbalanced
signaling and refers to point-to-point communications between one
driver and one receiver in a 4-wire bus system.
The RS-232 (single-ended) transmits at a relatively slow data rate (up
to 20K bits per second) and short distances (up to 50 Ft. @ the
maximum data rate).
This is the standard interface for half-duplex communications
conducted with a dual-state driver. It employs balanced signaling and
refers to multi-drop communications between one driver and up to ten
receivers, known as "straight-through" cabling in a 4-wire bus system.
The RS-422 (Differential) transmits a much faster data rate (up to 100K
bits per second) and longer distances (up to 4000 Ft. @ the maximum
data rate).
This is the standard interface for half-duplex communications
conducted in the tri-state or common mode. It employs balanced
signaling and refers to true multi-point communications between up to
32 drivers and 32 receivers, in 2-wire bus system.
The RS-485 (Differential) transmits a much faster data rate (up to 100K
bits per second) and longer distances (up to 4000 Ft. @ the maximum
data rate). It also supports more nodes per line because it uses lower
impedance drivers and receivers.
A collection of unrelated information that is treated as a single unit.
A storage device with a specific capacity, such as a bit, byte or word.
Electromechanical device containing a coil and set of contacts. The
contacts close when the coil is activated.
Not hard-wired; communicating via switched lines, such as telephone
lines. Usually refers to peripheral devices that are located a site away
from the CPU.
Totalflow's XSeries Remote Controller is a low power, microprocessor
based unit designed to meet a wide range of automation, monitor,
control, alarming and measurement applications.
2103971-001 – rev. AB