OPTO 22 G4LC32ISA-LT, Руководство пользователя

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1-2 G4LC32ISA-LT User’s Guide
The G4LC32ISA-LT comes standard with 256 KB of battery-backed RAM and 256 KB of flash
memory. The RAM can be used to store a user’s control program and data. The flash memory stores
a downloadable operating system (kernel) and can also be used to store a user’s control program
permanently. The use of flash technology allows a user to remotely download new kernels offered
by Opto 22. This avoids the need to go to the actual G4LC32ISA-LT location to download a new
kernel that offers features required for a given application.
Two serial ports are on the G4LC32ISA-LT and each may be configured for RS-232 or RS-485/422
communication. The RS-485/422 port may be used for I/O expansion using Opto 22 I/O units. The
RS-232 port may be used to connect to other serial devices, such as barcode readers or modems.
I/O Units
The G4LC32ISA-LT processor not only handles all the logic necessary to run your application
programs, but it also communicates with I/O units remote. I/O units are connected to the
G4LC32ISA-LT through its RS-485/422 serial link. You can serially connect up to 32 (256 with
repeaters) I/O units over a span of 3,000 feet (further distances with repeaters).
The I/O link is a twisted-pair serial interface (RS-485/422) communicating up to 115.2 KBd. You
can mix both digital and analog I/O units as needed and select the I/O unit size for your application.
Typical I/O units accommodate 16 I/O modules, while some have an I/O density as high as 32 points.
The G4LC32ISA-LT can control up to 4,096 I/O points per RS-485/422 communication link.
CRC 16-error detection is included in every message transaction between the G4LC32ISA-LT and
the connected I/O units, ensuring safe, reliable operation. Diagnostic LEDs are also provided on the
G4LC32ISA-LT to simplify debugging.
Software
The G4LC32ISA-LT is programmed using one of Opto 22’s PC-based graphical flowchart languages,
like OptoControl. Combined with Opto 22’s OptoDisplay and OptoServer software, the G4LC32ISA-LT
can handle many industrial control applications.
The G4LC32ISA-LT configuration and program development are performed through OptoControl on a
PC workstation. After your application is complete, you can download your control strategy to the
G4LC32ISA-LT either locally or remotely. You can then debug the program using the OptoControl
debug mode, again either locally or remotely.
OptoDisplay, a graphical user interface, uses the tag name database generated by OptoControl to
easily develop the tagnames used in the graphical display of your I/O process. Along with
OptoServer, you can develop client/server architectures supporting any DDE-aware application (such
as Microsoft Excel). In addition, rather than being limited to using Opto 22 software, the G4LC32ISA-
LT can be used with any third-party software package featuring an Opto 22 driver or custom user
code incorporating Opto 22’s Host Words.
INTRODUCTION