| Product
Details :
The MOSCAD CPU module is the brain of the MOSCAD product
line. It has a Motorola 68302 16/32-bit CMOS processor,
RAM, ROM, and Flash memory, lithium backup battery,
a real-time clock, plus the interfaces to the I/O
and communication aspects of the RTU. The CPU module
may be programmed, using the Programming ToolBox,
providing it with the capabilities expected of a PLC.
The Series 420 CPU module uses Flash memory instead
of EPROMs: upgrades to the operating system are easily
downloaded into the Flash memory. The Flash memory
is also used to store larger compressed source code
files. The Series 420 CPU accepts the download of
ModBus and other drivers, of compiled ‘C’
functions, etc; it must be used in Europe for compliance
with the standards on emissions and magnetic susceptability.
A real-time clock chip is located on the CPU module
and provides year (including leap year), month, day,
date, hour, minute, second, and milliseconds support
to the application. Diagnostic or error messages contain
the time of the occurence; input events may be time-tagged;
time-sensitive application tasks may be created. The
clocks within the RTUs may be synchronized by a manual
time download from the ToolBox, an automatic time
download from the SCADA Manager, or via an automatic
message from another RTU having a GPS receiver.
The CPU module contains three data ports with different
capabilities :
- Port 1 provides either RS-485 (2-wire multidrop)
or a partial RS-232 (data but no RTS, CTS, DTR,
etc.) communications to other CPU modules, to
the Programming ToolBox, or to the SCADA Manager
computer according to the port definition loaded
from the ToolBox.
- Port 2 provides a full RS-232 communications
and may be configured by the ToolBox as either
DTE or DCE for data connectivity under the control
of the loaded application or configured as a system
port for local or remote (dial-in) ToolBox use.
- Port 3 is normally the communications port and
contains a plug-in communication interface appropriate
to the medium used; it may also be provided with
a second full RS-232 capability when appropriate.
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