Omron CP - PROGRAMMING MANUAL 05-2007 - Page 985

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Failure Diagnosis Instructions Section 3-28
Description FPD(269) performs time monitoring and logic diagnosis. The time monitoring
function generates a non-fatal error with the specified FAL number if the diag-
nostic output is not turned ON within the specified monitoring time. The logic
diagnosis function indicates which input is preventing the output from being
turned ON.
Note *The logic diagnosis block begins with the first LD (not LD TR) or LD NOT
instruction after FPD(269) and ends with the first OUT (not OUT TR) or other
right-hand instruction.
Time Monitoring Function
FPD(269) starts timing when it is executed (when execution condition A goes
ON); it will generate a non-fatal error and turn ON the Carry Flag if the diag-
nostic output is not turned ON within the specified monitoring time.
Indirect DM addresses
in binary
--- @ D0 to @ D32767
Indirect DM addresses
in BCD
--- *D0 to *D32767
Constants Specified values
only
#0000 to #270F
(binary)
---
Data Registers ---
Index Registers ---
Indirect addressing
using Index Registers
--- ,IR0 to ,IR15
–2048 to +2047 ,IR0 to –2048 to
+2047 ,IR15
DR0 to DR15, IR0 to IR15
Area C T R
T
R
Diagnostic output B
Logic diagnosis function
Time monitoring function:
Starts timing when execution condition A goes ON.
Generates a non-fatal error if output B isn't turned
ON within the monitoring time.
Execution
condition A
Error-processing
block (optional)
Logic diagnosis block*
Next instruction block
Logic diagnosis
execution condition C
Determines which input in C prevents
output B from going ON.