4: B
ASIC
I
NSTRUCTIONS
4-10
FC6A S
ERIES
MICROS
MART
L
ADDER
P
ROGRAMMING
M
ANUAL
FC9Y-B1726
Timer Counting Error
Every timer instruction operation is individually based on asynchronous 16-bit reference timers. Therefore, an error can occur
depending on the status of the asynchronous 16-bit timer when the timer instruction is executed. Use of a TMS (1-ms timer) is
recommended to reduce advance errors.
Timeout Output Error
The output RAM status is set to the actual output when the END instruction is processed. When timeout output turns from off to
on, an error occurs depending on the position where the timer instruction is programmed in the user program. The timeout output
error shown below does not include output delay caused by the hardware.
Error Maximum and Minimum
Notes:
Advance error does not occur at the timer input and timeout output.
Tet + Tte = 1 scan time
Increment is 1 s (TML), 100 ms (TIM), 10 ms (TMH), or 1 ms (TMS).
The maximum advance error is: Increment – 1 scan time
The maximum behind error is: 3 scan times
The timer input error and timeout output error shown above do not include the input response time (behind error) and output response
time (behind error) caused by hardware.
Power Failure Memory Protection
Timers TML, TIM, TMH, and TMS do not have power failure protection. To provide a timer with this protection use a counter
instruction and special internal relay M8121 (1-s clock), M8122 (100-ms clock), or M8123 (10-ms clock).
Error
TML
(1-s timer)
TIM
(100-ms timer)
TMH
(10-ms timer)
TMS
(1-ms timer)
Maximum
Advance error
1,000 ms
100 ms
10 ms
1 ms
Behind error
1 scan time
1 scan time
1 scan time
1 scan time
Timeout output error is equal to Tte (behind error) and can be between
0 and one scan time.
0 < Tte < 1 scan time
Tte: Time from the timer instruction execution to the END processing
Error
Timer Input Error
Timer Counting
Error
Timeout Output
Error
Total Error
Minimum
Advance error
0 (Note)
0
0 (Note)
0
Behind error
Tet + Tie
0
Tte
0
Maximum
Advance error
0 (Note)
Increment
0 (Note)
Increment – (Tet + Tte)
Behind error
1 scan time +
Tet (1 scan time)
1 scan time
Tte (1 scan time)
2 scan times + (Tet + Tte)
Program Processing
Timeout Output RAM
ON
OFF
Actual Output
ON
OFF
END
1 scan time
TIM
END
Tte
Ladder Diagram
I1
I1
ON
OFF
C2
ON
OFF
Timing Chart
10 s
(10-s Timer)
CNT
C2
1000
M8123
Reset
Pulse
Note:
Designate counter C2 used in this program as a keep type counter. See Chapter 5 "Memory Backup" in
the "FC6A Series MICROSmart User’s Manual".
LODN
LOD
CNT
I1
M8123
C2
1000
Instruction
Data
Program List
Summary of Contents for MICROSmart FC6A Series
Page 1: ...B 1726 7 FC6A SERIES Ladder Programming Manual ...
Page 8: ...Preface 7 FC6A SERIES MICROSMART LADDER PROGRAMMING MANUAL FC9Y B1726 ...
Page 32: ...1 OPERATION BASICS 1 20 FC6A SERIES MICROSMART LADDER PROGRAMMING MANUAL FC9Y B1726 ...
Page 96: ...3 INSTRUCTIONS REFERENCE 3 18 FC6A SERIES MICROSMART LADDER PROGRAMMING MANUAL FC9Y B1726 ...
Page 130: ...4 BASIC INSTRUCTIONS 4 34 FC6A SERIES MICROSMART LADDER PROGRAMMING MANUAL FC9Y B1726 ...
Page 192: ...9 SHIFT ROTATE INSTRUCTIONS 9 12 FC6A SERIES MICROSMART LADDER PROGRAMMING MANUAL FC9Y B1726 ...
Page 272: ...12 DISPLAY INSTRUCTIONS 12 24 FC6A SERIES MICROSMART LADDER PROGRAMMING MANUAL FC9Y B1726 ...
Page 284: ...14 REFRESH INSTRUCTIONS 14 6 FC6A SERIES MICROSMART LADDER PROGRAMMING MANUAL FC9Y B1726 ...
Page 502: ...25 DATA LOG INSTRUCTIONS 25 22 FC6A SERIES MICROSMART LADDER PROGRAMMING MANUAL FC9Y B1726 ...
Page 546: ...26 SCRIPT 26 44 FC6A SERIES MICROSMART LADDER PROGRAMMING MANUAL FC9Y B1726 ...
Page 598: ...APPENDIX A 14 FC6A SERIES MICROSMART LADDER PROGRAMMING MANUAL FC9Y B1726 ...