Change Of Devices Between General Type And Latched (Backed-Up) Type; How To Initialize Latched (Backed-Up) Type Devices - Mitsubishi Electric MELSEC-Q Structured Programming Manual

FXCPU Structured Programming Manual
[Device & Common]
1.2.4

Change of devices between general type and latched (backed-up) type

FX /FX /FX /FX
0S 0 0N
(backed-up) type devices.
1. When using latched (backed-up) type devices as non-latched type devices
Some latched (backed-up) type devices can be changed into the non-latched type by parameter setting.
Devices dedicated to the latched type cannot be changed into the non-latched type.
Such devices can be handled as non-latched type devices by clearing all latched type devices using the initial
pulse (M8002) in a program.
2. When using non-latched type devices as latched (backed-up) type devices
Non-latched type devices can be changed into the latched (backed-up) type by parameter setting.
*1. In FX /FX
3G
selecting the battery mode using a parameter if an optional battery is attached.
1.2.5

How to initialize latched (backed-up) type devices

Latched (backed-up) type devices can be initialized by clearing the whole PLC memory using peripheral
equipment, clearing all latched type memories using the special auxiliary relay M8032, or executing the ZRST
instruction.
This subsection describes two major methods.
1. M8032 (latched type memory all clear)
When M8032 is set to ON, all latched (backed-up) devices
cleared.
M8032 can be set to ON and OFF using the forced ON/OFF operation from peripheral equipment or in a
sequence program. Note that latched type devices cannot be set to ON while M8032 is ON.
When M8032 is set to ON in a program, note that latched type devices are cleared during execution of the
END instruction after M8032 turns ON.
Program example:
This program clears all latched type devices.
M8002
Initial pulse
*1. General type devices which have been changed into the latched type in the FX
an optional battery attached are also cleared.
/FX /FX /FX /FX
1S 1N 1NC 3S
PLCs, non-latched type devices can be changed into the latched (backed-up) type by
3GC
M8032
3G *1 3GC *1
/FX PLCs do not support the type change of latched
*1
(including reset coils of timers and counters) are
→ For details, refer to Subsection 4.2.11.
1 Device Outline
1.2 Program Memory and Devices
/FX PLCs using
3G 3GC
33
1
2
3
4
5
6
7