Mitsubishi FX3U Series

FX3U Series Programmable Controllers
User’s Manual - Hardware Edition
455
A Operation of Special Devices (M8000 -, D8000 -)
A-2 Special Data Register (D8000 to D8511)
21
Memory Cassette
22
Battery
A
Special Devices (M8000-,D8000-)
B
Instruction List
C
Character-code
D
Discontinued models
Interrupt Program
D 8393 Delay time M8393
[D]8394
Not used
–
[D]8395 –
[D]8396 –
[D]8397 –
Ring Counter
D 8398 Lower Up-operation ring counter
of 0 to 2,147,483,647
(in units of 1ms, 32-bit)
*1
M8398
D 8399 Upper
*1. 1ms ring counter (D8399, D8398) will operate after M8398
turns ON.
RS2 (FNC 87) [ch1]
D 8400
RS2 (FNC 87) [ch1]
Communication format setting
–
[D]8401 Not used –
[D]8402
*2
RS2 (FNC 87) [ch1]
Remaining points of transmit data
M8402
[D]8403
*2
RS2 (FNC 87) [ch1]
Monitoring receive data points
M8403
[D]8404 Not used –
[D]8405
Communication parameter display
[ch1]
–
[D]8406
Not used
–
[D]8407 –
[D]8408 –
D 8409
RS2 (FNC 87) [ch1]
Time-out time setting
–
D 8410
RS2 (FNC 87) [ch1]
Header 1 and 2 <Default: STX>
–
D 8411
RS2 (FNC 87) [ch1]
Header 3 and 4
–
D 8412
RS2 (FNC 87) [ch1]
Terminator 1 and 2 <Default: ETX>
–
D 8413
RS2 (FNC 87) [ch1]
Terminator 3 and 4
–
[D]8414
RS2 (FNC 87) [ch1]
Receive sum (received data)
–
[D]8415
RS2 (FNC 87) [ch1]
Receive sum (calculated result)
–
[D]8416 RS2 (FNC 87) [ch1] Send sum –
[D]8417
Not used
–
[D]8418 –
[D]8419 Operation mode display [ch1] –
*2. Cleared when PLC switches from RUN to STOP.
RS2 (FNC 87) [ch2] and Computer Link [ch2]
D 8420
RS2 (FNC 87) [ch2]
Communication format setting
–
D 8421
Computer link [ch2] Station
number setting
–
[D]8422
*3
RS2 (FNC 87) [ch2] Remaining
points of transmit data
M8422
[D]8423
*3
RS2 (FNC 87) [ch2] Monitoring
receive data points
M8423
Number and
name
Content of register
Correspond-
ing special
device
[D]8424 Not used –
[D]8425
Communication parameter display
[ch2]
–
[D]8426 Not used –
D 8427
Computer link [ch2]
Specification of on-demand head
device register
M8426 to
M8429
D 8428
Computer link [ch2]
Specification of on-demand data
length register
D 8429
RS2 (FNC 87) [ch2], computer link
[ch2]
Time-out time setting
D 8430
RS2 (FNC 87) [ch2]
Header 1 and 2 <Default: STX>
–
D 8431
RS2 (FNC 87) [ch2]
Header 3 and 4
–
D 8432
RS2 (FNC 87) [ch2]
Terminator 1 and 2 <Default: ETX>
–
D 8433
RS2 (FNC 87) [ch2]
Terminator 3 and 4
–
[D]8434
RS2 (FNC 87) [ch2]
Receive sum (received data)
–
[D]8435
RS2 (FNC 87) [ch2]
Receive sum (calculated result)
–
[D]8436 RS2 (FNC 87) [ch2] Send sum –
[D]8437 Not used –
*3. Cleared when PLC switches from RUN to STOP.
Error Detection
[D]8438
Error code for serial
communication error 2 [ch2]
M8438
RS2 (FNC 87) [ch2] and Computer Link [ch2]
[D]8439 Operation mode display [ch2] –
Error Detection
[D]8440 to [D]8448 Not used –
[D]8449 Special block error code M8449
[D]8450 to [D]8459 Not used –
Positioning [FX3U and FX3UC PLCs]
[D]8460 to [D]8463 Not used –
D 8464
DSZR (FNC150) and ZRN
(FNC156) instructions:
[Y000] Clear signal device
specification
M8464
D 8465
DSZR (FNC150) and ZRN
(FNC156) instructions:
[Y001] Clear signal device
specification
M8465
D 8466
DSZR (FNC150) and ZRN
(FNC156) instructions:
[Y002] Clear signal device
specification
M8466
D 8467
*4
DSZR (FNC150) and ZRN
(FNC156) instructions:
[Y003] Clear signal device
specification
M8467
[D]8468 to [D]8511 Not used –
*4. Available only when two FX3U-2HSY-ADP adapters are
connected to an PLC.
Number and
name
Content of register
Correspond-
ing special
device