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Thanks to the
many built-in communication protocols, the Super PLCs also make more than great
serial-based I/O boards for PCs or Workstation!
You can use the T100MD's RS232 port for
straight forward connection to a PC. With an RS232-to-RS485 adapter (such as
the Auto485) as many as 31 super PLCs
can be connected to a single PC to provide distributed I/Os at up to 4000 ft
away. Click here to
view a sample Visual Basic communication program which is provided
to aid Visual Basic programmers to rapidly learn how to talk to our PLCs using
the native protocol.
T100MD+ not only offers analog I/Os and digital I/Os for the host PC, you can
make use of its local intelligence to obtain special I/Os such as PWM and Stepper Motor outputs, High Speed Encoder, Frequency
The PC can also
on local LCD
attached to the T100MD+ for a PC to send messages remotely to the factory floor,
for example. These features are simply impossible to find on other serial-based
"dumb" I/O boards.
The T100MD+ supports a few standard
communication protocols as follow:
1) Native ASCII based protocols, e.g.
2) MODBUS ASCII protocol. e.g. ":01030000000102nn"
RTU protocol (binary based).
4) OMRON C20H protocol (ASCII type).
Our proprietary ASCII based native protocol
allows you to read or write to every I/O and internal variable within the PLC
using a rather straightforward command/response exchange of ASCII strings.
Please see the T100MD+ User's Manual
Chapter 3 and 4 for detailed description of these protocols. A
The MODUS ASCII and RTU protocols are simple
but popular communication protocols and you can find their documentation at www.modbus.org. The memory
mapping of T100MD PLC to the MODBUS registers can be found in Chapter 5 of the
T100MD+ User's Manual.
In addition, you can even implement your own proprietary communication protocol
using the powerful TBASIC language! This allow a T100MD+ to be used with an
obsure host computer that must use a certain fixed, proprietary serial protocol
to control external I/Os.
Every T100MD+ PLC has built-in TBASIC commands (such
as NETCMD$, READMODBUS, WRITEMODBUS) for communicating with another PLCs or 3rd
party MODBUS devices. Hence it is possible for one or more T100MD+ to be used as
slave I/O boards for a master T100MD+ PLC. This makes it possible to use more
analog or special I/Os than are available on a standard T100MD+ PLC for complex
Example, in the arrangement shown
below the master PLC could have access to 24 analog I/Os,
6 PWMs, 6 stepper controllers and
6 encoder inputs!