Mitsubishi Electric MELSEC FX3U - Page 39

37
FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
2 Overview (Sequence Program)
2.6 Program Memory and Devices
1
Introduction
2
Overview
3
Instruction List
4
Devices in Detail
5
Specified the Device & Constant
6
Before Programming
7
Basic Instruction
8
FNC00-FNC09 Program Flow
9
FNC10-FNC19 Move & Compare
10
FNC20-FNC29 Arith. & Logic Operation
b) FX3G PLCs
*1. These registers can be changed from the general type to the latched (battery backed) type by the
parameter setting when the optional battery is installed.
*2. Some devices are cleared when the PLC status switches from STOP to RUN.
→ For special data registers, refer to Chapter 37.
*3. The clock data is held by the electricity charged in the large-capacity capacitor built in the PLC.
When the voltage of the large-capacity capacitor becomes low, the clock data is not held correctly.
The capacitor can hold the clock data for 10 days (when the ambient temperature is 25
°C ) in the full
charge state (achieved by powering ON the PLC for 30 minutes or more).
The clock data is backed up by the battery when the optional battery is installed and the battery mode is
selected in the parameter setting.
Item Power OFF
Power
OFF→ON
STOP→RUN RUN→STOP
Data register (D)
General type
Cleared.
*1
Does not change. Cleared.
Does not change while M8033 is ON.
latched (battery
backed) type
Does not change.
File type
Does not change.
Special type Cleared.
Set to initial
values.
*2
Does not change.
*2
Extension register
(R)
General type
Cleared.
*1
Does not change.
Extension file
register (ER)
File type Does not change.
Index register (V, Z) V, Z Cleared. Does not change.
Timer present value
register (T)
For 100 ms Cleared.
Does not change. Cleared.
Does not change while M8033 is ON.
For 10 ms Cleared.
Does not change. Cleared.
Does not change while M8033 is ON.
For 1 ms Cleared.
Does not change. Cleared.
Does not change while M8033 is ON.
Retentive type for
100 ms (battery
backed)
Does not change.
Retentive type for 1
ms(battery backed)
Does not change.
Counter present
value register (C)
General type Cleared.
Does not change. Cleared.
Does not change while M8033 is ON.
latched (battery
backed) type
Does not change.
High speed type
(battery backed)
Does not change.
Clock data
Present value
(battery backed)
Does not change.
*3