MITSUBISHI ELECTRIC 700 Series - Manual (Page 28)

23
Inverter Status Monitoring, Special Registers
for Control
1
P
L
C
FU
N
C
TI
O
N
1.7.2 Data that are read by controlling (OFF to ON) the read
command
You can read the operation mode and set frequency of the inverter.
Data are stored into the above data devices as soon as the read completion turns from
off to on after the read command has turned from off to on.
If the read command remains on, data is not refreshed. (Data is not updated.)
Turn the device off once, then on again to refresh data.
Data read timing chart
(1) Operation mode setting read (D9140)
<Operation mode setting read program example>
The following program reads the operation mode data to D0.
Device
No.
Name
Read
Command
Write
Completion
Data Access
Enable Condition
D9140 Operation mode setting read Y20 X20
Always D9141 Set frequency read (RAM) Y21 X21
D9142 Set frequency read (EEPROM) Y22 X22
Data Setting Operation Mode
H0000 NET operation mode
H0001 External operation mode
H0002 PU operation mode
REMARKS
When the Pr. 79 "operation mode selection" setting is other than "0", the operation mode is as
set. However, when Pr. 79 = "3" or "4", the operation mode is "H0002" (PU operation mode).
Read command
Read completion
Read data
User sequence
processing
1) Read command is turned
on in user sequence.
3) In user sequence, ON of read completion
is confirmed and data is read from special
register and processed.
4) After completion of read,
read command is turned off.
2) Inverter CPU stores inverter data
into special register and turns on
read completion. 5) Inverter CPU confirms that
read command is off and
turns off read completion.
Y2n(n=0 to 2)
X2n(n=0 to 2)
D914n(n=0 to 2)
Operation mode read setting request
Turns on operation mode
read request pulse.
Stores operation mode data to D0
when operation mode setting read
completion signal turns on.
Turns on operation mode setting
read command. (Until operation
mode setting read completion
signal turns on)