snap ethernet-based i/o units protocols and programming guide

APPENDIX A: SNAP ETHERNET-BASED BRAIN MEMORY MAP
Streaming—Read Only
This area can be used in two ways:
If you want this information in a compact form, you can read this area all at once instead of
reading several other sections.
You can stream data from the brain to PCs or other host devices. Streaming sends data at
stated intervals automatically and does not require a response. For more information, see
“Streaming Data” on page 35.
Starting Address Length Type Description
FFFF F100 0000 100 F Analog Engineering Units data for 64 points (float)
FFFF F100 0100 100 UI Digital point feature data (unsigned integer). Feature data for each
point depends upon the point configuration.
FFFF F100 0200 8 M State of digital points (mask)
FFFF F100 0208 8 M State of digital on-latches (mask)
FFFF F100 0210 8 M State of digital off-latches (mask)
FFFF F100 0218 8 M Active counters (mask)
Last valid address for this area: FFFF F100 021F
Alarm Event Settings—Read/Write
(Does not apply to SNAP Simple I/O) Use this area to configure deviation, high limit, and low limit
alarm events and reactions. See page 31 for information on configuring alarms and their
reactions.
Only the first two alarms are shown in the table. Successive alarms follow the same pattern and
start on even 80 hex boundaries.
Starting Address Length Type Description
FFFF F110 0000 4 B Alarm 0: Deviation alarm: in alarm state? (Boolean)
FFFF F110 0004 4 B Alarm 0: Enable deviation alarm (Boolean)
FFFF F110 0008 4 F Alarm 0: Deviation alarm: previous deviation value (float)
FFFF F110 000C 4 F Alarm 0: Deviation alarm, deviation amount (float)
FFFF F110 0010 8 M Alarm 0: Deviation alarm reaction: set Scratch Pad bits on (mask)
FFFF F110 0018 8 M Alarm 0: Deviation alarm reaction: set Scratch Pad bits off (mask)
FFFF F110 0020 4 B Alarm 0: High alarm: in alarm state? (Boolean)
FFFF F110 0024 4 B Alarm 0: Enable high alarm (Boolean)
134 SNAP Ethernet-Based I/O Units Protocols and Programming Guide