Publication 1756-RM004B-EN-P - October 2000
1-2 1756-MVI Module Overview
A block diagram of the module is shown in figure 1.1.
Figure 1.1 1756-MVI Module Block Diagram
The 1756-MVI module has three serial ports. Serial port PRT1 (also
called the “console port”) is used with a programming console via an
RS-232 interface. The other two serial ports, PRT2 and PRT3, can be
configured to communicate with foreign devices via RS-232, RS-422,
or RS-485 interfaces.
The 1756-MVI module includes the following features:
•
1M bytes of RAM for temporary storage of user programs and
data
•
Persistent program storage in FLASH memory, with 896K bytes
available for user program storage
•
Two RS-232 / RS-422 / RS-485 compatible serial ports for
communications to foreign devices (PRT2 and PRT3)
• One RS-232 compatible serial port for communicating with a
programming terminal (PRT1, console)
• LED’s for module status, communications status, and general
purpose use
• ControlLogix bus interface
• Embedded BIOS and DOS-compatible operating system.
Communications
Processor
ControlBus
I/F
Flash
ROM
RAM
RS-232
Serial Port
PRT1
(Console)
PRT2
PRT3
Compact
Flash
(Optional)
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