ProSoft Technology PTQ-AFC - Manual (Page 169)

PTQ-AFC ♦ Modicon Quantum Platform Backplane Communication
Liquid and Gas Flow Computer for Hydrocarbon Products User Manual
ProSoft Technology, Inc. Page 169 of 259
June 23, 2011
Type Description
Signal Processor sets to non-zero to issue the signal. AFC clears to zero to
acknowledge signal. To issue a signal:
(a) prepare any parameter data (e.g. gateway transaction, pass-thru
controls);
(b) set the signal word to any non-zero value;
(c) wait for the signal word to be cleared to zero (acknowledged);
(d) dispose of any results.
When the AFC acknowledges a signal by clearing the signal word, the
signalled action has been completed and results are immediately
available. To avoid unexpected consequences, while the signal word is
non-zero the processor must not alter any parameter data or rely upon
any results.
Control Processor sets to zero/non-zero to disable/enable
Error Indicates unexpected result from requested task
Status Indicates status of specific feature
Input Input from PTQ-AFC including error code
Output Output to PTQ-AFC