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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
37 Operation of Special Devices (M8000 -, D8000 -)
37.1 Special Device List (M8000 -, D8000 -)
Pulse width/Pulse period measurement [FX3G PLCs ]
D 8074
*1
Lower
[X000] Ring counter value for rising edge
(1/6 µs unit)
3
*2
– –
M8076
M8080
–––– –
D 8075
*1
Upper – – –––––
D 8076
*1
Lower
[X000] Ring counter value for falling edge
(1/6 µs unit)
3
*2
– – –––––
D 8077
*1
Upper – – –––––
D 8078
*1
Lower
[X000] Pulse width/Pulse period
(10 µs unit)
3
*2
– – –––––
D 8079
*1
Upper – – –––––
D 8080
*1
Lower
[X001] Ring counter value for rising edge
(1/6 µs unit)
3
*2
– –
M8077
M8081
–––– –
D 8081
*1
Upper – – –––––
D 8082
*1
Lower
[X001] Ring counter value for falling edge
(1/6 µs unit)
3
*2
– – –––––
D 8083
*1
Upper – – –––––
D 8084
*1
Lower
[X001] Pulse width/Pulse period
(10 µs unit)
3
*2
– – –––––
D 8085
*1
Upper – – –––––
D 8086
*1
Lower
[X003] Ring counter value for rising edge
(1/6 µs unit)
3
*2
– –
M8078
M8082
–––– –
D 8087
*1
Upper – – –––––
D 8088
*1
Lower
[X003] Ring counter value for falling edge
(1/6 µs unit)
3
*2
– – –––––
D 8089
*1
Upper – – –––––
D 8090
*1
Lower
[X003] Pulse width/Pulse period
(10 µs unit)
3
*2
– – –––––
D 8091
*1
Upper – – –––––
D 8092
*1
Lower
[X004] Ring counter value for rising edge
(1/6 µs unit)
3
*2
– –
M8079
M8083
–––– –
D 8093
*1
Upper – – –––––
D 8094
*1
Lower
[X004] Ring counter value for falling edge
(1/6 µs unit)
3
*2
– – –––––
D 8095
*1
Upper – – –––––
D 8096
*1
Lower
[X004] Pulse width/Pulse period
(10 µs unit)
3
*2
– – –––––
D 8097
*1
Upper – – –––––
D 8098 Not used
– – – – –––– –
*1. Cleared when PLC switches from STOP to RUN.
*2. Available in Ver. 1.10 or later.
High Speed Ring Counter
D 8099
Up-operation high speed ring counter of 0 to 32,767 (in
units of 0.1ms, 16-bit)
*3
– 3 3 M8099 – – 3 – 3
[D]8100 Not used
– – – – –––– –
*3. For FX2N/FX2NC, 0.1ms high speed ring counter D8099 will operate after END instruction is executed while
M8099 is ON.
For FX
3U/FX3UC, 0.1ms high speed ring counter D8099 will operate after M8099 turns ON.
Number and name Content of register
Applicable model
FX
3G
FX
3U
FX
3UC
Correspond-
ing special
device
FX
1S
FX
1N
FX
2N
FX
1NC
FX
2NC