ProSoft Technology MVI56-AFC - Manual (Page 191)

MVI56-AFC ♦ ControlLogix Platform MVI56-AFC Backplane Communication
Liquid and Gas Flow Computer User Manual
ProSoft Technology, Inc. Page 191 of 316
February 25, 2011
Description
This block issues signals to the meter logic in the AFC. A signal is an instruction
for the AFC to perform a function once. Signals are latched in the AFC and
remain pending until they are discharged. Typical signals are:
Reset Resettable Accumulator
Write Ad-hoc Archive Record
The AFC returns this block immediately, without delaying it until the signal is
discharged. However, it is still possible for the signal to be discharged before the
block is returned, so it is not guaranteed that output signal bits will be echoed in
the input. To schedule a signal, the Processor should latch the appropriate bit in
the output signal word (Note that AFC acts upon a signal bit transition from 0 to 1
only). The maps of available signal bits are provided in the following table.
Signals: Output Function Block OFB Signals: Input Function Block IFB
Element Attribute Element Attribute
0 Block ID - Function Code & Mtr No. 0 Block ID - Function Code & Mtr No.
1 Signal Bits 1 Pending Signals (see description above)
Bit # Meter Signal Bits
0 Select Stream 1 (version 2.05
and later)
1 Select Stream 2 (version 2.05
and later)
2 Select Stream 3 (version 2.05
and later)
3 Select Stream 4 (version 2.05
and later)
4 Reset Resettable Accumulator 1
5 Reset Resettable Accumulator 2
6 Reset Resettable Accumulator 3
7 Reset Resettable Accumulator 4
8 Write Daily Archive
9 Write Hourly Archive
10 to
15 Reserved
Bit # Site Signal Bits
0 Event log download complete
(purge event log)
1 Clear all checksum alarms
2 to
15 Reserved
Special Note: Using Meter Number Value of 0 in OFB ID to write Site Signal Bits
Set the Meter number to 0 to write to the Site Signal bits.
Set the Meter number (1 through 16) to write to the selected Meter Signal bits.
Note: Refer to Function Block Structure (page 168) for information on Bit 8 and 9 settings.