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Failure Diagnosis Instructions
Section 3-30
3-30-3 FAILURE POINT DETECTION: FPD(269)
Purpose
Diagnoses a failure in an instruction block by monitoring the time between
execution of FPD(269) and execution of a diagnostic output and finding which
input is preventing an output from being turned ON.
Ladder Symbol
Variations
Applicable Program Areas
Operands
C: Control Word
C must be a constant between 0000 and 01FF or between 8000 and 81FF.
The following diagram shows the function of the digits in the control word.
T: Monitoring Time
T must be between 0 and 9,999 decimal (between 0000 and 270F Hex). A
value of 0 disables time monitoring; values in the range of 1 to 270F set the
monitoring time from 0.1 to 999.9 seconds.
R: First Register Word
The functions of the register words are described on page 953.
Operand Specifications
C: Control word
T: Monitoring time
R: First register word
FPD(269)
C
T
R
Variations
Executed Each Cycle for ON Condition
FPD(269)
Executed Once for Upward Differentiation
Not supported.
Executed Once for Downward Differentiation Not supported.
Immediate Refreshing Specification
Not supported.
Block program areas
Step program areas
Subroutines
Interrupt tasks
Not allowed
OK
OK
Not allowed
FAL number: 000 to 1FF
Diagnostic output mode
0: Bit address output only (hexadecimal)
8: Bit address and message output (ASCII)
15
0
11
12
C
Area
C
T
R
CIO Area
---
CIO 0000 to CIO 6143
Work Area
---
W000 to W511
Holding Bit Area
---
H000 to H511
Auxiliary Bit Area
---
A000 to A447
A448 to A959
A448 to A959
Timer Area
---
T0000 to T4095
Counter Area
---
C0000 to C4095
DM Area
---
D00000 to D32767
EM Area without bank
---
E00000 to E32767
Summary of Contents for CJ1G-CPUxx
Page 3: ...iv N o t i c e ...
Page 5: ...vi ...
Page 21: ...xxii Conformance to EC Directives 6 ...
Page 35: ......
Page 1131: ...1110 CJ series Instruction Execution Times and Number of Steps Section 4 2 ...