ProSoft Technology PTQ-AFC - Manual (Page 119)

PTQ-AFC ♦ Modicon Quantum Platform Quick Start
Liquid and Gas Flow Computer for Hydrocarbon Products User Manual
ProSoft Technology, Inc. Page 119 of 259
June 23, 2011
Tag Rkv Description
1 - Event Log Download
Value: Number of last-downloaded event.
Notes: Triggered by a purge of the Event Log, which marks older events
as available to be overwritten by new ones.
2 - Cold Start
Value: Always 0.
Notes: This event is obsolete and is never written.
3 (1) Power-Up
Value: "Old" value is the last-saved wallclock from the previous session;
"new" value is always 0 (clock not yet set).
Notes: The last event written upon restart of the application and before
entering the meter scan. This event may be preceded by Checksum
Alarm and/or PLC Mode Change events.
4 - PLC Mode Change
Value: PLC mode (0 on line, 1 off line).
Notes: Logs changes to PLC connectivity as reported by the backplane
procedures. Typically caused by switching the PLC between "run" and
"program" modes.
5 - Checksum Alarm
Value: Checksum alarm word (datum type "Bsht").
Notes: Logs changes to the checksum alarm bitmaps.
Includes site/meter identification (bits 28-24).
Upon power-up:
Written automatically upon power up when a checksum failure is
detected. In this case the event is written even if the bitmap does not
change, such as when an affected bit is already set from a previous
failure that was never cleared.
Upon Modbus write to the bitmap:
Records changes to the bitmap only, typically when clearing bits, though
setting bits is also permitted.
6 (2) Wallclock Change
Value: Wallclock (packed bitfields).
Notes: Triggered when the wallclock is set for the first time, or when it is
reset to a value that differs from its current value by five minutes or
more. These two cases can be distinguished by the "old value" in the
event entry: for the initial setting this value is zero ("clock not set").
7
* Stream Select
Value: Stream number.
Notes: Triggered by a "select active stream" meter signal.
Includes meter identification (bits 28-24).
6.12.8 Site Datum Point events
Grup Sbgp Item DTyp Rkv Data point
0 0 0 Bsht (3) Site options
1 Site parameter value
0 0 Flot * Barometric pressure
8 n 0 Usht - Arbitrary event-logged value "n" ("n" = 0 thru 9)
15 PLC image address (Quantum platform only)
0 0 Usht * Supervisory, get
1 0 Usht * Supervisory, put
2 0 Usht * Wallclock, get & put
3 0 Usht * Modbus gateway, get & put