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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 -)
Stepladder and Annunciator
[D]8040
*1
ON state number 1
The smallest number out of active state ranging from S0 to
S899 and S1000 to S4095
*2
is stored in D8040 and the
second-smallest state number is stored in D8041.
Active state numbers are then sequentially stored in
registers up to D8047 (Max. 8 points).
3 3 3
M8047
3333 3
[D]8041
*1
ON state number 2
3 3 333333
[D]8042
*1
ON state number 3
3 3 333333
[D]8043
*1
ON state number 4
3 3 333333
[D]8044
*1
ON state number 5
3 3 333333
[D]8045
*1
ON state number 6
3 3 333333
[D]8046
*1
ON state number 7
3 3 333333
[D]8047
*1
ON state number 8
3 3 333333
[D]8048 Not used
– – – – –––– –
[D]8049
*1
On state minimum
number
When M8049 is ON, the smallest number out of active
annunciator relay ranging from S900 to S999 is stored in
D8049.
3 3 3 M8049 – – 3 – 3
[D]8050 to [D]8059 Not used
– – – – –––– –
*1. Executed at END instruction.
*2. S1000 to S4095 are available only in FX
3G/FX3U/FX3UC PLCs.
Error Detection (Refer to Chapter 38 for details.)
[D]8060
If the unit or block corresponding to a programmed
I/O number is not actually loaded, M8060 is set to ON and
the first device number of the erroneous block is written to
D8060.
3 3 3 M8060 – – 3 – 3
[D]8061 Error code for PLC hardware error
3 3 3 M8061 33333
[D]8062
Error code for PLC/PP communication error
3 3 3 M8062 – – 3 – 3
Error code for serial communication error 0 [ch0]
3 – – M8062 – – – – –
[D]8063
*4
Error code for serial communication error 1 [ch1] 3 3 3 M8063 33333
[D]8064 Error code for parameter error
3 3 3 M8064 33333
[D]8065 Error code for syntax error
3 3 3 M8065 33333
[D]8066 Error code for ladder error
3 3 3 M8066 33333
[D]8067
*5
Error code for operation error 3 3 3 M8067 33333
D 8068
*5
Operation error step number latched 3
3
*6
3
*6
M8068 3333 3
[D]8069
*5
Error step number of M8065 to M8067 3
3
*7
3
*7
M8065 to
M8067
3333 3
*3. 10 to 337 in FX3U, FX3UC, FX2N and FX2NC PLCs, and 10 to 177 in FX3G PLCs
*4. The operation varies according to PLC:
- Cleared in an FX
1S, FX1N, FX2N, FX1NC, or FX2NC when PLC switches from STOP to RUN.
- Cleared in an FX
3G, FX3U, or FX3UC PLC when the power is turn off and on.
*5. Cleared when PLC switches from STOP to RUN.
*6. In case of 32K steps or more, step number is stored in [D8313, D8312].
*7. In case of 32K steps or more, step number is stored in [D8315, D8314].
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
1 0 2 0
1: Input X 0: Output Y
Device number
Example: If X020 is unconnected.
BCD converted value
*3