Rockwell Automation 2708-DH5B2L_DH5B4L Attended Workstation - Manual (Page 124)

A–B
C
Appendix
C–1
Technical Description
The 2708-DH5B2L and -DH5B4L workstations have been designed for use
in both factory and office environments. They are protected against the
hardships presented by many factory environments and offices including
sunlight, spills, dust, and most corrosive substances (NEMA Type 1
enclosure). The case is made of rugged steel and aluminum.
1. Software Features
•
Programmable in Microsoft Visual BASIC.
•
Simple, error free data entry with edit checking performed at the
terminal.
•
Operations can be interactive, transaction oriented, or fully offline.
•
The host can be connected via RS-232 or RS-422 and collect data
from all workstations in either input only mode or in an interactive
polled model.
•
A password protected menu mode which allows parameters to be
changed without requiring either communications from the Host or
opening the workstation.
•
Up to 1024 workstations can transfer data to a single RS-232 or
RS-422 port on the Host computer using simple asynchronous
communicatioins.
•
No controller is required, since all communication between
workstations is handled transparently via the network cable.
•
Large networks can be laid out conveniently using a backbone
network collecting data from tributary networks.
•
Portions of the network can be attached using modems and switched
lines allowing remote tributary networks.
•
Complete fault tolerance is provided through the use of alternate
routing and off-line operation.
•
Full error detecting and retransmission network protocol operates
transparently to the Host. All Host I/O is via simple asynchronous
records.
•
Terminal mode allows operation as a “dumb terminal” for applications
requiring total Host control.