Failure Point Detection - Fpd - Omron SYSMAC C200HS Operation Manual

Special Instructions
Example
00000
DM 0000
DM 0001
DM 0002
DM 0003
DM 0004
DM 0005
DM 0006
DM 0007
5-25-12 FAILURE POINT DETECTION – FPD(––)
Limitations
Description
When IR 00000 is ON in the following example, the frame checksum (0008) is
calculated for the 8 words from DM 0000 to DM 0007 and the ASCII equivalent
(30 30 30 38) is written to DM 0011 and DM 0010.
@FCS(––)
#0008
DM 0000
DM 0010
FCS
0001
calculation
0002
0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0
0003
0004
0005
0006
0007
DM 0011
0008
Ladder Symbols
FPD(––)
C
T
D
D and D+8 must be in the same data area when bit 15 of C is ON.
C must be input as a constant.
FPD(––) can be used in the program as many times as desired, but each must
use a different D. It is used to monitor the time between the execution of FPD(––)
and the execution of a diagnostic output. If the time exceeds T, an FAL(06) non-
fatal error will be generated with the FAL number specified in C.
The program sections marked by dashed lines in the following diagram can be
written according to the needs of the particular program application. The proces-
sing programming section triggered by CY is optional and can used any instruc-
tions but LD and LD NOT. The logic diagnostic instructions and execution condi-
tion can consist of any combination of NC or NO conditions desired.
Execution
condition
Logic
diagnostic
instructions
Address Instruction
00000 LD
00001 @FCS(––)
0 0 0
3 0 3 0 DM 0010 3 0 3 8
Operand Data Areas
T: Monitoring time (BCD)
IR, SR, AR, DM, HR, TC. LR, #
Branch
SR 25504
(CY Flag)
Section 5-25
Operands
00000
# 0008
DM 0000
DM 0010
8
ASCII code
conversion
C: Control data
#
D: First register word
IR, AR, DM, HR, LR
FPD(––)
C
T
D
Processing after
error detection.
Diagnostic
output
285