Emerson Vission 20/20 Operation And Service Manual page 194

Appendix B • Vission 20/20 Application Procedures
REMOTE COMPRESSOR CONTROL VIA
COMMUNICATIONS
A compressor control scheme that is accomplished via
communications must follow some general rules. The
Vission 20/20 panel does not have a separate processor
to handle communications from a computer or PLC. All
tasks that the panel needs to accomplish are done by a
single processor. So when a device communicates to the
Figure B-24. Typical Block Diagram of a Multi-Compressor Control Scheme (1 of 4)
B - 38
panel, the polling rate to the 20/20 panel can't be unlim-
ited, it needs to be governed.
A typical compressor control scheme might look like
this:
(For communication register information, refer Table
B-4)
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 2.0