Mitsubishi Electric MELSEC FX3U Programming Manual page 890

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
Number and name
Ring Counter
M 8398
Ring counter operation (in units of 1ms, 32 bits)
[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
*1
RS2 (FNC 87) [ch1] Send wait flag
[M]8401
*1
RS2 (FNC 87) [ch1] Send request
M 8402
*1
RS2 (FNC 87) [ch1] Receive complete flag
M 8403
[M]8404 RS2 (FNC 87) [ch1] Carrier detection flag
[M]8405 RS2 (FNC87) [ch1] Data set ready (DSR) flag
[M]8406
[M]8407 Not used
[M]8408
M 8409 RS2 (FNC 87) [ch1] Time-out check flag
*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.
888
Operation and function
37 Operation of Special Devices (M8000 -, D8000 -)
37.1 Special Device List (M8000 -, D8000 -)
Applicable model
Correspond
FX FX FX -ing special
3G 3U 3UC
device
D8398,
*4
D8399
– – –
– – –
D8402
D8403
*2 *2
– – –
– – –
– – –
FX FX FX FX
1S 1N 2N 1NC
– – – –
– – – – –
– – – – –
– – – – –
– – – –
– – – –
– – – – –
– – – – –
– – – – –
– – – – –
– – – – –
– – – – –
FX
2NC
–
–
–
–
–
–
–
–
–
–
–
–