431
FX3UC Series Programmable Controllers
User’s Manual - Hardware Edition
C Operation of Special Devices (M8000 -, D8000 -)
C-1 Special Auxiliary Relay (M8000 to M8511)
11
Memory
Cassette/Battery
12
Test Run,
Maintenance,
Troubleshooting
A
Version
Information
B
Performance
Specifications
C
Special Devices
(M8000 -,D8000 -)
D
Instruction List
E
Character-code
F
Discontinued
models
RS2 (FNC 87) [ch2] and Computer Link [ch2]
[M]8410 to [M]8420
Not used –
[M]8421
*1
RS2 (FNC 87) [ch2] Send wait flag
–
M 8422
*1
RS2 (FNC 87) [ch2] Send request
D8422
M 8423
*1
RS2 (FNC 87) [ch2]
Receive complete flag
D8423
[M]8424
RS2 (FNC 87) [ch2]
Carrier detection flag
–
[M]8425
*2
RS2 (FNC 87) [ch2]
Data set ready (DSR) flag
–
[M]8426 Computer link [ch2] Global ON
D8427
D8428
D8429
[M]8427
Computer link [ch2]
On-demand send processing
M 8428
Computer link [ch2]
On-demand error flag
M 8429
Computer link [ch2]
On-demand Word/Byte changeover
RS2 (FNC 87) [ch2]
Time-out check flag
*1. Cleared when PLC switches from RUN to STOP or when
RS2 instruction [ch2] is OFF.
*2. Supported in Ver. 2.30 or later
Error Detection
[M]8430 to [M]8437
Not used
–
M 8438
Serial communication error 2 [ch2] D8438
[M]8439 to [M]8448
Not used
–
[M]8449
*3
Special block error flag
D8449
[M]8450 to [M]8459
Not used –
*3. Supported in Ver. 2.20 or later
Positioning
M 8460
*4
DVIT (FNC151) instruction [Y000]
User interrupt input command
D8336
M 8461
*4
DVIT (FNC151) instruction [Y001]
User interrupt input command
D8336
M 8462
*4
DVIT (FNC151) instruction [Y002]
User interrupt input command
D8336
M 8463 Not used –
M 8464
*4
DSZR (FNC150), ZRN (FNC156)
instructions [Y000]
Clear signal device specification
function enabled
D8464
M 8465
*4
DSZR (FNC150), ZRN (FNC156)
instructions [Y001]
Clear signal device specification
function enabled
D8465
M 8466
*4
DSZR (FNC150), ZRN (FNC156)
instructions [Y002]
Clear signal device specification
function enabled
D8466
M 8467
Not used
–
[M]8468 to [M]8511
Not used
–
*4. Supported in Ver. 2.20 or later
Number and
name
Operation and function
Correspond-
ing special
device
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