Mitsubishi Electric MELSEC FX3U - Page 890

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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 -)
Ring Counter
M 8398
Ring counter operation (in units of 1ms, 32 bits)
*4
3 3 3
D8398,
D8399
–––– –
[M]8399 Not used
– – – – –––– –
*4. 1ms ring counter (D8399, D8398) will operate after M8398 turns ON.
RS2 (FNC 87) [ch1] (Refer to Data Communication Edition for details.)
[M]8400 Not used
– – – – –––– –
[M]8401
*1
RS2 (FNC 87) [ch1] Send wait flag 3 3 3 – –––– –
M 8402
*1
RS2 (FNC 87) [ch1] Send request 3 3 3 D8402–––– –
M 8403
*1
RS2 (FNC 87) [ch1] Receive complete flag 3 3 3 D8403–––– –
[M]8404 RS2 (FNC 87) [ch1] Carrier detection flag
3 3 3 – –––– –
[M]8405 RS2 (FNC87) [ch1] Data set ready (DSR) flag
3
3
*2
3
*2
– –––– –
[M]8406
Not used
– – – – –––– –
[M]8407
– – – – –––– –
[M]8408
– – – – –––– –
M 8409 RS2 (FNC 87) [ch1] Time-out check flag
3 3 3 – –––– –
*1. These devices are cleared when the PLC mode switches from RUN to STOP or when the RS2
instruction [ch1] turns OFF.
*2. Available in Ver. 2.30 or later.
Number and name Operation and function
Applicable model
FX 3G FX3U FX 3UC
Correspond
-ing special
device
FX 1S FX 1N FX 2N FX 1NC FX 2NC