Functions And Operation Examples - Mitsubishi Electric MELSEC-Q Structured Programming Manual

FXCPU Structured Programming Manual
[Device & Common]
3. FX /FX /FX
0S 0
FX FX
0S/ 0
PLC
FX PLC
0N
FX FX
U/ 2C
PLC
FX U PLC (Ver.
2.30 or earlier)
(Reference)
*1. This area is not latched (backed up). It can be changed to the latched (backed-up) area by parameter
setting.
*2. This area is latched (backed up). It can be changed to the non-latched (non-backed-up) area by
parameter setting.
*3. This area is fixed to the latched (backed-up) type. (The contents can be cleared by the RST and ZRST
instructions.)
*4. This area is fixed to the non-latched (non-backed-up) type. The characteristics of latch (backup)
cannot be changed.
2.3.2

Functions and operation examples

1. General type
M100
NO contact
M100
NC contact
Auxiliary relay circuit
42
/FX /FX PLCs
0N U 2C
General type Latched (backed-up) type
M0 to M495
*4
496 points
M0 to M383
*4
384 points
M0 to M499
*1
500 points For link
Parent → Child:M800 to M899
Child → Parent:M900 to M999
All of general type auxiliary relays turn OFF when the PLC is turned
OFF.
M100
When the ON/OFF status of auxiliary relays just before power
interruption is required for control, use latched (backed-up) type
auxiliary relays.
Fixed latched
(backed-up) type
M496 to M511
-
16 points
M384 to M511
-
128 points
M500 to M1023 M1024 to M1535
*2
524 points 512 points
2 Devices in Detail
2.3 Auxiliary relay [M]
Special type
M8000 to M8254
*3
57 points
M8000 to M8254
*3
67 points
M8000 to M8255
*3
173 points
M8000 to M8255
-
169 point